Consulta: subjectFacets:"Heavy metals"
Registros recuperados: 198
Data/hora: 04/06/2024 11:07:55

Aprovechamiento de la humedad atmosférica como fuente no convencional de agua para uso doméstico.
Provedor de dados: 32
Autores: Bautista Olivas, Ana Laura.
En esta investigación se plantearon tres objetivos generales los cuales fueron: 1) Proponer un modelo matemático para predecir la cantidad de agua atmosférica que se puede obtener con el prototipo CP-HID-04 en la Ciudad de México considerando la humedad relativa del ambiente y temperatura ambiental; estos modelos se validaron calculando los siguientes índices: MBE (error medio), RMBE (raíz cuadrada del error cuadrático, D (Índice de acuerdo), R2 (coeficiente de determinación). 2) Cuantificar la cantidad de coliformes totales y fecales encontradas en muestras de agua atmosférica obtenidos en tres sitios de estudio: San Felipe Hidalgo, Tlaxcala;  Huichapan, Hidalgo y en la Ciudad de México. 3) Evaluar la calidad del agua obtenida de la atmósfera,...
Palavras-chave: Agua atmosférica; Modelo matemático; Calidad de agua; Coliformes fecales; Metales pesados; Atmospheric water; Mathematical model; Water quality; Fecal coliform; Heavy metals; Hidrociencias; Doctorado.
Ano: 2013
URL: http://hdl.handle.net/10521/2008

Mecanismos de tolerancia del simbiosistema Azolla-Anabaena azollae ante arsénico y cobre.
Provedor de dados: 32
Autores: Sánchez Viveros, Gabriela.
Esta investigación evaluó algunos mecanismos de tolerancia del simbiosistema Azolla-Anabaena azollae ante agua contaminada con arsénico (As+5) y/o cobre (Cu2+). Para lo anterior, se plantearon seis fases experimentales: 1) identificar molecularmente a nivel de especie a diez colectas de Azolla, 2) evaluar la capacidad de acumulación de As+5 y los efectos tóxicos del metaloide en el simbiosistema Azolla-Anabaena azollae, 3) determinar la influencia del As+5 en la concentración de nueve elementos en las frondas de Azolla filiculoides, 4) evaluar el efecto del Cu2+ sobre la actividad fotosintética y permeabilidad de la membrana de Azolla filiculoides y Azolla caroliniana, 5) comparar la capacidad de acumulación de Cu2+ en dos especies de Azolla y, 6) conocer...
Palavras-chave: Contaminación; Fitorremediación; Helechos; Metales pesados; Metaloides; Contamination; Ferns; Heavy metals; Metalloids; Phytoremediation; Edafología; Doctorado.
Ano: 2012
URL: http://hdl.handle.net/10521/632

Respuesta fisiológica de miembros del género Trichoderma a hidrocarburos poliaromáticos.
Provedor de dados: 32
Autores: Argumedo Delira, Rosalba.
Las especies del género Trichoderma representan un grupo de hongos filamentosos que pertenecen al Reino Mycetae (Fungi), División Eumycota, Subdivisión Ascomycotina, Clase Euascomycetes, Orden  Hypocreales, Familia Hypocraceae y Género Trichoderma e Hypocrea. Estos hongos se caracterizan por predominar en los ecosistemas terrestres y acuáticos. Los miembros del género Trichoderma tienen el potencial de sintetizar y liberar diversas enzimas que se han aprovechado en procesos industriales. Además, este grupo fúngico es importante para las plantas, al contribuir en el control de organismos fitopatógenos ya que poseen propiedades micoparasíticas y antibióticas. Por otro lado, las especies del género Trichoderma son capaces de acumular metales pesados, degradar...
Palavras-chave: Trichoderma; Tolerancia; Citocromo P450; Naftaleno; Metales pesados; Fenantreno; Benzo[a]pireno; Tolerance; Heavy metals; Cytochrome P450; Naphthalene; Phenanthrene; Doctorado; Edafología.
Ano: 2011
URL: http://hdl.handle.net/10521/389

Determinación de la concentración de metales pesados en agua, suelo y cultivos regados con agua de la Presa Manuel Avila Camacho.
Provedor de dados: 32
Autores: Larenas Bazán, Nelli Natalia.
La presa Manuel Ávila Camacho se construyó para aprovechar los escurrimientos de los ríos Atoyac y Alseseca, con propósitos de riego. La contaminación de estos ríos tiene su origen en las descargas de aguas residuales urbanas e industriales, y el uso de aguas residuales no tratadas para la irrigación de cultivos agrícolas, ha contribuido en la contaminación de suelos y plantas por metales pesados (MP), lo cual representa un riesgo para la salud humana y animal. En este sentido, el objetivo de la investigación consistió en la determinación de la concentración de MP, características físicas y químicas en agua residual y suelo, así como la concentración de MP en cultivos de maíz y alfalfa ubicados en los módulos uno, dos y tres del Distrito de Riego 030...
Palavras-chave: Contaminación; Metales pesados; Agua; Suelo; Planta; Pollution; Heavy metals; Water; Soil; Plant; EDAR; Estrategias para el Desarrollo Agrícola Regional; Maestría.
Ano: 2010
URL: http://hdl.handle.net/10521/271

Metales pesados en suelos cultivados con caña de azúcar en la Chontalpa, Tabasco
Provedor de dados: 32
Autores: Cruz Pons, Alfredo de la.
La actividad industrial y agrícola pueden ser fuentes de metales pesados que en concentraciones críticas en los suelos afectan el desarrollo de las plantas. En la Chontalpa, Tabasco, el cultivo de la caña de azúcar es importante por su extensión, producción de azúcar y la generación de empleos. En las zonas de abastecimiento del cultivo, existen dos ingenios azucareros que emiten gases a la atmósfera durante la zafra, así como una batería de separación de hidrocarburos que durante muchos años emitió gases a la atmósfera. La presente investigación se planteó como objetivos determinar el contenido de metales pesados en suelos y hojas de caña de azúcar en la zona cañera de la Chontalpa cercanos a la actividad petrolera y agroindustrial. El muestreo se realizó...
Tipo: Tesis
Palavras-chave: Metales pesados; Caña de azúcar; Suelos; Maestría; Producción Agroalimentaria en el Trópico.; Heavy metals; Sugar cane; Soils.
Ano: 2008
URL: http://hdl.handle.net/10521/1637

Efecto ambiental y económico-social por la aplicación de biosólidos de origen urbano como mejoradores de suelos agrícolas.
Provedor de dados: 32
Autores: González Flores, Eduardo.
La generación y disposición final de los biosólidos producidos en las plantas de tratamiento de aguas residuales, es un grave problema ambiental. La aplicación en suelos agrícolas es una opción viable por su contenido de materia orgánica, N, P y micronutrimentos. La principal restricción es su contenido de metales pesados. En la ciudad de Puebla de Zaragoza, México, los biosólidos generados se aplican en suelos agrícolas de comunidades rurales cercanas. Los suelos son delgados y de baja productividad y se cultiva principalmente maíz. El objetivo del presente trabajo fue evaluar los efectos ambientales, económicos y sociales producidos por la aplicación de biosólidos en los agroecosistemas de la comunidad La Paz Tlaxcolpan, Puebla. Se tomaron muestras de...
Palavras-chave: Metabolismo social; Biodisponibilidad; Biosólidos; Metales pesados; Agroecosistema; Social metabolism; Bioavailability; Biosolids; Heavy metals; Agroecosystem; Doctorado; EDAR; Estrategias para el Desarrollo Agrícola Regional.
Ano: 2011
URL: http://hdl.handle.net/10521/531

Manejo y uso de biosólidos en suelos agrícolas
Provedor de dados: 32
Autores: Robledo Santoyo, Edmundo.
Como subproducto del tratamiento de las aguas residuales de la ciudad de Aguascalientes, Ags., en la Planta de Tratamiento “El Niágara”, se generan diariamente de 150 a 170 m3 de biosólidos. Estos materiales son aplicados a suelos agrícolas de áreas cercanas a la planta, sin regulación alguna, por lo que se han obtenido buenos resultados o causado quemaduras en plántulas o endurecimiento de suelos. El objetivo de este proyecto fue generar estrategias para la disposición y aprovechamiento de los biosólidos para mejorar suelos agrícolas y la calidad y rendimiento de los cultivos, sin perjuicio para el ambiente. Para determinar el efecto de los biosólidos sobre suelos y plantas, se colectaron muestras de los biosólidos y se tomaron muestras de tres tipos de...
Palavras-chave: Aguas residuales; Metales pesados; Contaminación; Mejoradores del suelo; Wastewater; Heavy metals; Contamination; Soil amendments; Edafología; Doctorado.
Ano: 2012
URL: http://hdl.handle.net/10521/1733

Indices de salinidad y calidad de las aguas superficiales de Tlaxcala, Puebla y Veracruz.
Provedor de dados: 32
Autores: Mancilla Villa, Oscar Raúl.
En la actualidad se utiliza prácticamente toda agua disponible para satisfacer los requerimientos de humedad en diferentes cultivos que se explotan activamente en agricultura de riego, utilizándose aguas superficiales y subterráneas de variada composición química y concentración de sales. En Tlaxcala, Puebla y Veracruz son irrigadas más de 1 022 000 ha con diversos cultivos, otros usos del agua son la industria, la geotermia, la acuicultura y la recreación. Para conocer las características fisicoquímicas de estas aguas, se llevó a cabo una investigación de tipo observacional, prospectiva, transversal y descriptiva, con recorridos científicos y muestreos de agua en 2009, 2010 y 2011, con 548 muestras totales. En cada muestra de agua se realizaron 26...
Palavras-chave: RAS; PSI; Riego; Metales pesados; Vía evolutiva geoquímica; SAR; ESP; Irrigation; Heavy metals; Geochemical evolutionary path; Doctorado; Hidrociencias.
Ano: 2012
URL: http://hdl.handle.net/10521/742

Efecto ambiental y económico-social por la aplicación de biosólidos de origen urbano como mejoradores de suelos agrícolas.
Provedor de dados: 32
Autores: González Flores, Eduardo.
La generación y disposición final de los biosólidos producidos en las plantas de tratamiento de aguas residuales, es un grave problema ambiental. La aplicación en suelos agrícolas es una opción viable por su contenido de materia orgánica, N, P y micronutrimentos. La principal restricción es su contenido de metales pesados. En la ciudad de Puebla de Zaragoza, México, los biosólidos generados se aplican en suelos agrícolas de comunidades rurales cercanas. Los suelos son delgados y de baja productividad y se cultiva principalmente maíz. El objetivo del presente trabajo fue evaluar los efectos ambientales, económicos y sociales producidos por la aplicación de biosólidos en los agroecosistemas de la comunidad La Paz Tlaxcolpan, Puebla. Se tomaron muestras de...
Palavras-chave: Metabolismo social; Biodisponibilidad; Biosólidos; Metales pesados; Agroecosistema; Social metabolism; Bioavailability; Biosolids; Heavy metals; Agroecosystem; Doctorado; EDAR; Estrategias para el Desarrollo Agrícola Regional.
Ano: 2011
URL: http://hdl.handle.net/10521/531

Respuesta fisiológica de miembros del género Trichoderma a hidrocarburos poliaromáticos.
Provedor de dados: 32
Autores: Argumedo Delira, Rosalba.
Las especies del género Trichoderma representan un grupo de hongos filamentosos que pertenecen al Reino Mycetae (Fungi), División Eumycota, Subdivisión Ascomycotina, Clase Euascomycetes, Orden  Hypocreales, Familia Hypocraceae y Género Trichoderma e Hypocrea. Estos hongos se caracterizan por predominar en los ecosistemas terrestres y acuáticos. Los miembros del género Trichoderma tienen el potencial de sintetizar y liberar diversas enzimas que se han aprovechado en procesos industriales. Además, este grupo fúngico es importante para las plantas, al contribuir en el control de organismos fitopatógenos ya que poseen propiedades micoparasíticas y antibióticas. Por otro lado, las especies del género Trichoderma son capaces de acumular metales pesados, degradar...
Palavras-chave: Trichoderma; Tolerancia; Citocromo P450; Naftaleno; Metales pesados; Fenantreno; Benzo[a]pireno; Tolerance; Heavy metals; Cytochrome P450; Naphthalene; Phenanthrene; Doctorado; Edafología.
Ano: 2011
URL: http://hdl.handle.net/10521/389

Isolation and characterization of novel potent Cr(VI) reducing alkaliphilic Amphibacillus sp. KSUCr3 from hypersaline soda lakes
Provedor de dados: 69
Autores: Ibrahim,Abdelnasser S.S; El-Tayeb,Mohamed A; Elbadawi,Yahya B; Al-Salamah,Ali A.
A strain KSUCr3 with extremely high Cr(VI)-reducing ability under alkaline conditions was isolated from hypersaline soda lakes and identified as Amphibacillus sp. on the basis of 16S rRNA gene sequence analysis. The results showed that Amphibacillus sp. strain KSUCr3 was tolerance to very high Cr(VI) concentration (75 mM) in addition to high tolerance to other heavy metals including Ni2+ (100 mM), Mo2+ (75 mM), Co2+ (5 mM), Mn2+ (100 mM), Zn2+ (2 mM), Cu2+ (2 mM) and Pb (75 mM). Strain KSUCr3 was shown to be of a high efficiency in detoxifying chromate, as it could rapidly reduce 5 mM of Cr(VI) to a non detectable level over 24 hrs. In addition, strain KSUCr3 could reduce Cr(VI) efficiently over a wide range of initial Cr(VI) concentrations (1-10 mM) in...
Tipo: Journal article
Palavras-chave: Amphibacillus sp.; Bioremediation; Chromate reduction; Heavy metals; Soda lake.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000400004

Natural carriers in bioremediation: A review
Provedor de dados: 69
Autores: Dzionek,Anna; Wojcieszy&amp;#324;ska,Danuta; Guzik,Urszula.
Bioremediation of contaminated groundwater or soil is currently the cheapest and the least harmful method of removing xenobiotics from the environment. Immobilization of microorganisms capable of degrading specific contaminants significantly promotes bioremediation processes, reduces their costs, and also allows for the multiple use of biocatalysts. Among the developed methods of immobilization, adsorption on the surface is the most common method in bioremediation, due to the simplicity of the procedure and its non-toxicity. The choice of carrier is an essential element for successful bioremediation. It is also important to consider the type of process ( n s tu or ex s tu), type of pollution, and properties of immobilized microorganisms. For these reasons,...
Tipo: Journal article
Palavras-chave: Adsorption; Bioethanol production; Contamination; Heavy metals; Immobilization; Immobilized microorganisms; Natural carriers; Wine alterations; Wood barrels; Xenobiotics.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000500008

Equilibrium sorption isotherm studies of Cd(II), Pb(II) and Zn(II) ions detoxification from waste water using unmodified and EDTA-modified maize husk
Provedor de dados: 69
Autores: Igwe,Jude C; Abia,Augustin A.
The mobilization of heavy metals in the environment due to industrial activities is of serious concern due to the toxicity of these metals in humans and other forms of life. The equilibrium adsorption isotherms of Cd(II), Pb(II) and Zn(II) ions, detoxification from waste water using unmodified and EDTA-modified maize husk have been studied. Maize husk was found to be an excellent adsorbent for the removal of these metal ions. The amount of these metal ions adsorbed increased as the initial concentration increased. Also, EDTA-modification enhanced the adsorption capacity of maize husk due to the chelating ability of ethylenediamine tetra acetic acid (EDTA). Among the three adsorption isotherms tested, Dubinin-Radushkevich isotherm gave the best fit with R²...
Tipo: Journal article
Palavras-chave: Adsorption isotherm; EDTA; Heavy metals; Maize husk; Waste water.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000400007

Removal of heavy metals by exopolymeric substances produced by resistant purple nonsulfur bacteria isolated from contaminated shrimp ponds
Provedor de dados: 69
Autores: Panwichian,Saijai; Kantachote,Duangporn; Wittayaweerasak,Banjong; Mallavarapu,Megharaj.
Two purple nonsulfur bacteria (PNSB) strains, Rhodobium marinum NW16 and Rhodobacter sphaeroides KMS24 were investigated for their potential to remove heavy metals (HMs) from contaminated shrimp pond water. Tolerance of both PNSB strains growing with both microaerobic-light and aerobic-dark conditions, based on their minimum inhibitory concentrations, was in the order of Cu2+ &gt; Zn2+ &gt; Cd2+ (Pb precipitation occurred at 0.34 mM). Results from a scanning electron microscope equipped with an energy dispersive X-ray spectrometer (SEM-EDX) indicated that Cu2+ and Zn2+ altered the cellular morphology of both strains and accumulated HMs were found in their cells. The highest amounts of both cations were found in their cell walls followed by the cytoplasm...
Tipo: Journal article
Palavras-chave: Contamination; Exopolymeric substances; Heavy metals; Photosynthetic bacteria; Shrimp farming.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000400002

Isolation of purple nonsulfur bacteria for the removal of heavy metals and sodium from contaminated shrimp ponds
Provedor de dados: 69
Autores: Panwichian,Saijai; Kantachote,Duangporn; Wittayaweerasak,Banjong; Mallavarapu,Megharaj.
In order to determine whether waters used for the shrimp cultivation contained toxic levels of heavy metals (HMs) and sodium (Na), analysis was carried out on 31 shrimp ponds in areas of southern Thailand. Purple nonsulfur bacteria (PNB) were also isolated from the same ponds to investigate if they could be used for bioremediation of the above contaminants. The highest HMs concentrations of the sediment samples in mg/kg dry weight were found as follows: 0.75 cadmium (Cd), 62.63 lead (Pb), 34.60 copper (Cu) and 58.50 zinc (Zn). However, all sediment samples met Hong Kong standards for dredged sediment. In contrast, contamination of Cu (9-30 µg/L) and Zn (140-530 µg/L) exceeding the standard guidelines for marine aquatic animal set by the Pollution Control...
Tipo: Journal article
Palavras-chave: Bioremediation; Heavy metals; Purple nonsulfur bacteria; Salinity; Shrimp farming.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000400003

Dynamic Cr(III) uptake by Macrocystis pyrifera and Undaria pinnatifida biomasses
Provedor de dados: 69
Autores: Plaza Cazón,Josefina; Viera,Marisa; Donati,Edgardo.
Background: The increased industrial activity has resulted in the discharge of large amount of pollutants including non-degradable metals into the environment. Chromium is produced in several industrial processes and it can be found in the environment in two stable oxidation states, Cr(VI) and Cr(III). Cr(VI) is more hazardous due to its carcinogenic and mutagenic effects on living organisms. Although much less toxic, Cr(III) can also exert genotoxic effects under prolonged or severe exposure. It can be separated from the solution by precipitation but biosorption using brown algae seems to be an effective and sustainable treatment technique owing to its cost-effectiveness and environmental friendly characteristics. Macrocystis pyrifera and Undaria...
Tipo: Journal article
Palavras-chave: Biosorption; Brown algae; Chromium; Heavy metals.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000300006

Induction of in vitro roots cultures of Thypha latifolia and Scirpus americanus and study of their capacity to remove heavy metals
Provedor de dados: 69
Autores: Santos-Díaz,María del Socorro; Barrón-Cruz,María del Carmen; Alfaro-De la Torre,María Catalina.
We have established the conditions to obtain in vitro root cultures of Thypha latifolia and Scirpus americanus and have investigated their capacity to remove Pb(II), Mn(II) and Cr(III) from the culture medium. The best conditions for the in vitro culture growth were: an inoculum of 0.2 g of T. latifolia roots and 0.05 g of S. americanus roots (fresh weight), Murashige-Skoog medium and 2 mg L-1of indolacetic acid. The T. latifolia and S. americanus root cultures were cultivated onto media containing Cr (15 µg L-1), Pb (60 µg L-1) or Mn (1.8 mg L-1). Both species were able to remove Pb and Cr near to 100% and 71-100% of Mn from the medium solution during the 6-8 days of experimentation. According to metal concentrations removed from the medium containing the...
Tipo: Journal article
Palavras-chave: Heavy metals; In vitro root cultures; Phytoremediation; Scirpus americanus; Thypha latifolia.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000300009

GEOCHEMICAL BACKGROUND IN AN OXISOL
Provedor de dados: 70
Autores: Cembranel,Adir S.; Sampaio,Silvio C.; Remor,Marcelo B.; Gotardo,Jackeline T.; Rosa,Pábolla M. Dalla.
ABSTRACT Geochemical background establishment is indispensable to determine the actual state of contamination of soils and sediments. However, no scientific consensus exists regarding the methodology for determining these values. In this context, this study aimed to establish the geochemical background in an Oxisol (Rhodic Hapludox) by means of an integrated method that uses direct and indirect soil analyses to identify the most appropriate calculation methodology. Soil samples were collected in a permanent preservation area of the Cascavel River watershed, PR, Brazil. The elements Cd, Co, Cr, Cu, Fe, K, Mg, Mn, Na, Ni, Pb, and Zn present in soil samples were quantified by flame atomic absorption spectrometry. The use of a permanent preservation area is...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trace elements; Heavy metals; Sediment; Soil.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000300565

Lead concentration and allocation in vegetable crops grown in a soil contaminated by battery residues
Provedor de dados: 75
Autores: Lima,Francisco de S; Nascimento,Clístenes WA do; Silva,Fernando BV da; Carvalho,Vinícius GB de; Ribeiro Filho,Mateus R.
Lead (Pb) is a very stable metal in soil and is highly toxic to humans and animals. Exposure to Pb occurs via inhalation of particles from industry and soil, as well as household dust, water, and contaminated food. A greenhouse experiment was carried out to evaluate Pb contents and allocation in vegetable crops grown in a soil contaminated by battery recycling wastes. Eight plant species were studied: tomato, sweet pepper, beet, carrot, cabbage, green collards, eggplant, and okra. The experiment was set up in blocks at random with four replicates. The results showed that carrot, green collards, beet, and okra were the most Pb tolerant species, while the others were very Pb-sensitive, since they did not complete their cycle. The decreasing order for Pb...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Battery recycling; Soil pollution; Soil contamination; Heavy metals.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362009000300019

Многомерный анализ распределения бентосных диатомовых (Bacillariophyta) в поле градиентов абиотических факторов в Cевастопольской бухте (Черное море, Крым)
Provedor de dados: 13
Autores: Петров, А. Н.; Неврова, Е. Л.; Малахова, Л. В.
Проведен сравнительный анализ видовой структуры и количественного распределения бентосных диатомо­вых водорослей в многомерном пространстве градиентов абиотических переменных, определяющих эколо­гическую ситуацию в Севастопольской бухте. С использованием метода главных компонент и на основе рас­чета коэффициентов ранговой корреляции Спирмана (р) из исходных данных, включающих 26 физико-химических параметров, выделена комбинация из 7 абиотических факторов (глубина + фракция грунта 0,25∻0, 1мм+Cd+Eh+Mn+ПXБ+Zn), в наибольшей степени определяющих количественное распределение диатомовых в биотопе. По результатам кластерного анализа на основе сходства станций по 7 абиотическим факторам, все множество станций (32) было подразделено на три...
Tipo: Journal Contribution
Palavras-chave: Бентосные диатомовые; Bacillariophyta; Структура таксоцена; Многомерный статистический анализ; Антропогенное воздействие; Тяжелые металлы; Черное море; Benthic diatoms; Taxocene structure; Multivariate analysis; Technogenic pollution; Heavy metals; Black Sea.
Ano: 2005
URL: http://repository.ibss.org.ua/dspace/handle/99011/220

Сезонная динамика содержания тяжёлых металлов в мидии (Mytilus galloprovincialis) из бухты  Казачья Чёрного моря
Provedor de dados: 13
Autores: Козинцев, А. Ф.
Исследована сезонная динамика концентрации Cd, Cu, Fe, Ni, Pb и Zn в мягких тканях и раковинах двустворчатых моллюсков Mytilus galloprovincialis Lam. из Казачьей бухты Чёрного моря. Показано, что для концентраций железа, никеля, кадмия и свинца в мягких тканях мидий достоверно существует  периодичность изменений в течение года. Концентрации железа, никеля, кадмия и цинка достоверно увеличиваются, а концентрация свинца уменьшается с ростом температуры воды. Для раковин моллюсков получена периодичность изменения концентраций железа, кадмия и цинка. Концентрация химических элементов в мягких тканях мидий достоверно выше, чем в раковинах. Казачья бухта по санитарно-гигиеническим нормам концентрации исследованных тяжёлых металлов является перспективной...
Tipo: Journal Contribution
Palavras-chave: Мидия; Тяжёлые металлы; Сезонная динамика; Чёрное море; Mussel; Heavy metals; Season dynamics; Black Sea Heavy metals Mussel culture Seasonal variations Heavy metals http://aims.fao.org/aos/agrovoc/c_2223.
Ano: 2006
URL: http://repository.ibss.org.ua/dspace/handle/99011/274

Загрязнение Геленджикской бухты ливневым стоком
Provedor de dados: 13
Autores: Крыленко, В. В.; Есин, Н. В.
Проанализированы результаты гидрохимических съёмок в акватории Геленджикской бухты, выполненных с целью определения объемов загрязняющих веществ, выносимых ливневыми стоками. Установлено, что загрязнение морской воды проявляется в образовании отдельных линз с высокой концентрацией загрязняющих веществ вблизи источников загрязнения. В Геленджикской бухте коэффициент горизонтального обмена воды очень мал, поэтому пятна «грязной» воды сохраняются в течение длительного времени. Во время действия ветра, направленного с берега в море, загрязненная вода уходит в море, её замещает чистая вода открытого моря. Рассчитаны объемы сбрасываемых в бухту нефтепродуктов и тяжелых металлов.
Tipo: Journal Contribution
Palavras-chave: Pollution; Oil pollution; Heavy metals; Heavy metals; Pollution; Http://aims.fao.org/aos/agrovoc/c_2223; Http://aims.fao.org/aos/agrovoc/c_6077.
Ano: 2001
URL: http://repository.ibss.org.ua/dspace/handle/99011/570

Сравнительный анализ структуры таксоцена донных диатомовых (Bacіllarіophyta) в районах с разным уровнем техногенного загрязнения (Черное море, Крым)
Provedor de dados: 13
Autores: Петров, А. Н.; Неврова, Е. Л.
С применением алгоритмов многомерной статистики проведен сравнительный анализ особенностей структуры таксоценов донных диатомовых в двух районах юго-западного Крыма – бухтах Ласпи и Севастопольская, донные отложения которых различаются по уровню содержания ряда тяжелых металлов, хлорорганических соединений и нефтяных углеводородов. По результатам кластерного и ординационного анализа для каждого из районов выделены таксоценотические комплексы и внутрикомплексные группировки диатомовых, для которых выявлены наиболее значимые индикационные виды. Межкомплексные отличия в структурной организации таксоценов выражены в большей степени, и, вероятно, вызваны разной реакцией дискриминаторных видов, вносящих определяющий вклад в эти различия, к высокому уровню...
Tipo: Journal Contribution
Palavras-chave: Диатомовые водоросли; Bacillariophyta.; Структура таксоцена; Индикаторы; Многомерный статистический анализ; Тяжелые металлы; Хлорорганические соединения; Черное море; Diatom algae; Taxocenе structure; Indicators; Multivariate statistical analysis; Heavy metals; Chlorine-organic compounds; Black Sea Indicators Heavy metals Heavy metals http://aims.fao.org/aos/agrovoc/c_2223.
Ano: 2004
URL: http://repository.ibss.org.ua/dspace/handle/99011/57

Розподiл важких металiв у гiдроекосистемi озера Пiсочне Шацького нацiонального природного парку (Украiна)
Provedor de dados: 13
Autores: Гуменюк, Г. Б.; Редчук, Н. В.; Грубiнко, В. В.
Представлены результаты изучения аккумуляции и перераспределения тяжелых металлов (валового содержания и концентрации растворённых форм) - меди, кобальта, цинка, марганца (биогенных), а также свинца, кадмия и никеля (небиогенных) - в пресноводной экосистеме (воде, прибрежном иле) в озере Песочное Шацкого национального природного парка в зависимости от физических, гидрофизических и биологических факторов.
Tipo: Journal Contribution
Palavras-chave: Heavy metals; Freshwater lakes; Heavy metals; Http://aims.fao.org/aos/agrovoc/c_2223.
Ano: 2007
URL: http://repository.ibss.org.ua/dspace/handle/99011/607

Utilizacao do lodo de esgoto na agricultura. 2. metais pesados.
Provedor de dados: 14
Autores: SILVA, J. E. da S.; RESCK, D. V. S.; SHARMA, R. D.
bitstream/item/121712/1/gtec-38.pdf
Tipo: Séries anteriores (INFOTECA-E)
Palavras-chave: Lodo de esgoto.; Agricultura; Cerrado; Metal Pesado.; Agriculture; Heavy metals; Sewage sludge.
Ano: 1999
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/545880

Potencial de remoção de metais pesados em água subterrânea por meio de adsorção usando biomassa seca de plantas aquáticas como adsorventes naturais.
Provedor de dados: 14
Autores: TAVARES, S. R. de L.; OLIVEIRA, S. A. de.
O processo de remediação de solos e águas subterrâneas contaminados se refere à redução dos teores de contaminantes em níveis seguros e compatíveis com a proteção à saúde humana, impedindo ou dificultando a disseminação de substâncias nocivas ao ambiente. Atualmente, existe uma tendência mundial de dar preferência às técnicas de remediação in situ, por apresentarem baixos custos e não provocarem contaminações secundárias. Quando as águas subterrâneas estão contaminadas por metais pesados, a tecnologia de barreira reativa é usualmente empregada no aquífero contaminado. Este trabalho teve por objetivo avaliar a potencialidade do uso de biomassa morta de macrófitas como um material sorvente em barreiras reativas permeáveis na remediação de água subterrânea...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Resíduo Quimico; Metal Pesado; Água do Solo; Biomassa; Solo; Contaminação; Chemical residues; Heavy metals; Biomass.
Ano: 2012
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/950831

Risco de contaminação do solo e das plantas com metais pesados devido à irrigação com água produzida na extração de petróleo.
Provedor de dados: 14
Autores: CRISOSTOMO, L. A.; WEBER, O. B.; MIRANDA, F. R. de; SOUSA, A. F.; ARAGAO, F. A. S. de.
O reuso da água produzida em campo petrolífero pode ser alternativa para irrigação de culturas não alimentares quando não há riscos de contaminação ambiental. Este trabalho teve por objetivo avaliar o aporte de metais pesados na produção das oleíferas girassol (Helianthus annuusL) e mamona (Ricinus communis L.) e do abacaxizeiro ornamental (Ananas comosus var. erectifolius) irrigados com dois tipos de água produzida: filtrada (APF) e tratada por osmose reversa (APO) em comparação à água do subsolo, captada do aquífero Açu (ACA). As concentrações dos metais Ba, Cd, Co, Cr, Ni, Pb e Zn foram avaliadas no solo e nas plantas antes e após a irrigação por três ciclos de girassol, dois ciclos de mamona e um ciclo do abacaxizeiro. Portanto, recomenda-se o...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Salinização; Wastewater; Heavy metals.
Ano: 2018
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1102058

Fitorremediação de metais pesados em solo induzido por agente quelante utilizando o capim vetiver.
Provedor de dados: 14
Autores: TAVARES, S. R. de L.; OLIVEIRA, S. A. de.
O tratamento de áreas contaminadas é conhecido por remediação e pode envolver medidas para eliminar, imobilizar ou reduzir o contaminante para níveis aceitáveis e previamente definidos. Uma das tecnologias de remediação de solos e águas contaminadas utiliza plantas e seus microorganismos associados e é, por isso, denominada de fitorremediação. Este boletim teve por objetivo principal verificar o potencial da utilização da técnica de fitorremediação de metais pesados para a descontaminação de solo e água em níveis compatíveis com as legislações brasileiras, avaliando o desempenho do capim vetiver (Vetiveria zizanioides (L.) Nash) em solo contaminado com diferentes doses de metais pesados, na presença e na ausência do agente quelante (EDTA). O experimento...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Capim Vetiver; Fitorremediação de metal; Agente quelante; Planta fitoextratora; Solo; Poluição do Solo; Metal Pesado; Heavy metals; Soil pollution; Phytoremediation.
Ano: 2012
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/950813

Uso agrícola de composto de lixo: efeito do tempo de incubação solo/resíduo na disponibilidade de metal pesado.
Provedor de dados: 14
Autores: SILVA, F. C. da; SILVA, C. A.; BERGAMASCO, A. F.; RAMALHO, A. L.
O uso agrícola dos compostos de lixo (CL) urbano constitui a alternativa de maior visibilidade técnico-científica-econômica, pois estes são fontes de nutrientes e de matéria orgânica. Entretanto, é importante esclarecer que o uso do CL deve ser regulamentado, disciplinado e orientado tecnicamente por protocolos que definam a sua disposição final prevista em legislação, pois estes materiais podem conter metais pesados, que podem acumular-se nos alimentos e serem ingeridos pelo homem. Dentro desse contexto o trabalho buscou supror a deficiência de conhecimento relativo ao tempo que os metais pesados (Cádmio - Cd, Crômio - Cr, Cobalto- Co, Níquel - Ni e Chumbo - Pb), permanecem disponíveis nos solos após a adição do CL. A estração foi feita pelo método...
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Cana-de açúcar; Sugar cane.; Composto Orgânico; Compostagem; Fertilidade do Solo; Metal Pesado.; Composting; Heavy metals; Organic compounds; Soil fertility.
Ano: 2000
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/7865

Depuration of copper nitrate and chloride in the Indian brown mussel Perna indica
Provedor de dados: 5
Autores: Kondajii, N; Menon, N.
It is understood that the rate of bioaccumulation and subsequent depuration of heavy metals in marine animals is influenced by the chemical state, as well as the kinetics of transformation between different species of chemical salts dissolved in water. The Indian Brown mussel, Perna indica, was exposed to copper nitrate and chloride, individually, to analyse the rate of accumulation, depuration, oxygen uptake and filtration rates. When supplied in very low quantities, environmentally realistic concentrations, the rate of accumulation of copper nitrate and chlorides showed variations. When the animals were transferred to sea water, these two salts did not show any clear cut differences in the depuration rate. Irrespective of the previous accumulation...
Tipo: Text
Palavras-chave: Perna indica; Bivalvia; Chlorides; Copper; Mussel culture; Heavy metals; Marine pollution; Accumulation; Self purification.
Ano: 1992
URL: http://archimer.ifremer.fr/doc/1992/acte-1603.pdf

Modeling trace metal accumulation in the mediterranean mussel, mytilus galloprovincialis
Provedor de dados: 5
Autores: Casas, Stellio; Cossa, Daniel; Gonzalez, Jean-louis; Bacher, Cedric; Andral, Bruno.
Monitoring coastal contamination by trace metals pollution using mollusks bivalves as quantitative bioindicators is widely performed in many international biomonitoring programs. In this purpose, modeling metal dynamic in marine mussels is a reliable tool. It allows understanding the bioaccumulation process which results from the interactions between biological, chemical and environmental factors. To calibrate such a model, kinetic experiments on uptake and elimination were conducted on three Mediterranean sites chosen on the basis of their different nutritive and chemical characteristics.
Tipo: Text
Palavras-chave: Growth; Heavy metals; Bioaccumulation; Mytilus galloprovincialis; Bioindicator.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/acte-370.pdf

Heavy metals effect on bacterial communities from coastal sediments.
Provedor de dados: 5
Autores: Modamio, X; Mallo, S.
The effects of heavy metals on bacterial communities of sea sediments are studied. Samples were taken from a very polluted zone near Barcelona. Bacterial populations were estimated by the plate count method, using culture medium amended with heavy metals (Hg, Cd, Cr and Cu). The authors have also made a numerical taxonomy study with a hundred resistant strains, using 129 unit characters.
Tipo: Text
Palavras-chave: Microorganisms; Marine environment; Toxicity; Bacteria; Numerical taxonomy; Sediment pollution; Pollution effects; Heavy metals.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-1013.pdf

X - Variation de la concentration en métaux lourds dans l'eau, les mollusques et le sédiment d'un bassin aménagé
Provedor de dados: 5
Autores: Vicente, N.; Chabert, D.
The study of variations in the concentration of heavy metals inside a tank filled with the water of a neighbouring lagoon has been carried out since August 1977•The analysis concerned a lagoon station and the bath built for ECOTRON program, closed to this lagoon. They deal with water, molluscs and the sediment. Inside the lagoon station, the tested molluscs are Prosobranch Gastropods : Trochocochlea carinata and inside the basin, cockles : Cerastoderma glaucum. The results point out that the concentration of these heavy metals vary with the tissue in relation with physical and chemical medium parameters, and it can be particularly observed a significative correlation between both the whole concentration of these elements inside the sediment and the...
Tipo: Text
Palavras-chave: Pollution; Métaux lourds; Lagune; Méditerranée; Pollution; Heavy metals; Lagoon Mediterranean sea.
Ano: 1979
URL: http://archimer.ifremer.fr/doc/00306/41675/40884.pdf

Toxicite des Elements Metalliques Dissous pour les Larves d'Organismes Marins: Donnees Bibliographiques.
Provedor de dados: 5
Autores: Deslous-paoli, Jean-marc.
A bibliographic review has been made on the toxicity of ten metals for some marine larvae of commercial interest. We have classified, according to toxicity, organic salts of tin, mercury, silver, copper, zinc, nickel, lead, cadmium, chromium and manganese. Some synergistic effects of metals, temperature and salinity are described as well as the action of silt suspended in water.
Tipo: Text
Palavras-chave: Mollusca; Crustacea; Pollution effects; Bibliographies; Salinity; Temperature; Synergism; Heavy metals; Toxicity.
Ano: 1981
URL: http://archimer.ifremer.fr/doc/1981/publication-1885.pdf

Construction and use of a dialysis chamber for investigating in situ the toxicity of heavy metals on bacteria.
Provedor de dados: 5
Autores: Tan, T.
Teflon dialysis sampling chambers have been employed to study the toxicity of ZnCl sub(2) on a cadmium-sensitive bacterium, Acinetobacter) CS 13, in an aquarium with running seawater. A concentration of 10 mg Zn super(++) l super(-1) did not influence the cell densities in the chambers, but cell densities decreased at zinc concentrations of 15 and 20 mg l super(-1). In seawater with 20 mg Zn super(++) lu-1 the bacteria accumulated zinc from 827 to 2813 mu g g super(-1) cells dry wt after 1 d. After 2 d the zinc concentration increased to 4625 mu g g super(-1) dry wt. Three chambers were filled with Acinetobacter CS 13 cells added to sterile sediment at a concentration of 1 x 10 super(8) cells ml super(-1) wet sediment. To test the security, these chambers...
Tipo: Text
Palavras-chave: Acinetobacter; Bacteria; Laboratory culture; Tests; Zinc; Dialysis; Toxicity; Heavy metals.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-1012.pdf

Bacterial community structure along the Adour estuary (French Atlantic coast): influence of salinity gradient versus metal contamination
Provedor de dados: 5
Autores: Goni-urriza, M. S.; Point, D.; Amouroux, D.; Guyoneaud, R.; Donard, O. F. X.; Caumette, P.; Duran, R.
Salinity, other physico-chemical parameters and anthropogenic pollution are the main factors affecting bacterial communities in estuaries. We estimated the impact of these parameters on the distribution of bacterial communities in the Adour estuary (France), a moderately Polluted water body characterized by short residence times of particles and water and absence of a maximum turbidity zone. Eight stations were established along the salinity gradient from freshwater to marine conditions. For the 3 typical estuarine stations (water mixing zone), samples were collected at both low and high tide and at different depths according to the position of the halocline. This sampling strategy generated 35 samples with different degrees of mixing between fresh water...
Tipo: Text
Palavras-chave: Bacterial communities; Salinity gradient; Heavy metals; Estuary; Halocline; T-RFLP.
Ano: 2007
URL: https://archimer.ifremer.fr/doc/00249/35983/34517.pdf

Biological and ecological factors related to trace element levels in harbour porpoises (Phocoena phocoena) from European waters
Provedor de dados: 5
Autores: Lahaye, V; Bustamante, Paco; Law, J.r; Learmonth, J.a; Santos, M.b.; Boon, J.p.; Rogan, E; Dabin, W; Addink, M.j.; Lopez, A; Zuur, A.f.; Pierce, G.j.; Caurant, Florence.
Selected trace elements (Cd, Cu, Hg, Se, Zn) were measured in the kidneys and the liver of 104 harbour porpoises (Phocoena phocoena) stranded along the coasts of France, Galicia (Spain), Ireland, Scotland (UK), and the Netherlands. Generally, relatively low concentrations of toxic elements were encountered in the tissues of European porpoises, except for two individuals, which displayed high hepatic Hg concentrations. Also, elevated Cd levels obtained in Scottish porpoises could be related to their feeding preferences and this result suggests an increase of the proportion of cephalopods in their diet with latitude. Moreover, significant geographical differences were seen in hepatic Zn concentrations; the elevated Zn concentrations displayed by porpoises...
Tipo: Text
Palavras-chave: Tracers; Multivariate analysis; Diet; Age; Marine mammals; Zinc; Cadmium; Mercury; Heavy metals.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2920.pdf

Characterization of sperm motility in sea bass: the effect of heavy metals and physicochemical variables on sperm motility
Provedor de dados: 5
Autores: Abascal, F; Cosson, J; Fauvel, Christian.
Computer assisted sperm analysis (CASA) was used to characterize the motility of sea bass Dicentrarchus labrax spermatozoa and to study the effect of several physicochemical variables and heavy metals on sperm swimming performance. Duration of sperm motility in sea bass was very short (&lt; 50 s). During the first 20 s all the motility variables measured remained approximately constant, the velocity and linearity of the movement being maximum during this period, while both variables decreased sharply later. While slight variations in pH did not significantly modify sperm swimming performance, changes in osmolality affected all the measured motility variables. Two of the heavy metals tested, Cu2+ and Pb2+, did not affect sperm motility when the activating...
Tipo: Text
Palavras-chave: Sperm; Heavy metals; Dicentrarchus labrax; CASA.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-4765.pdf

Ecological and biological factors controlling the concentrations of trace elements (As, Cd, Cu, Hg, Se, Zn) in delphinids Globicephala melas from the North Atlantic Ocean
Provedor de dados: 5
Autores: Caurant, Florence; Amiard, Jean-claude; Amiard-triquet, Claude; Sauriau, Pierre-guy.
Trace elements (As, Cd, Cu, Hg, Se and Zn) were determined in liver and kidney of pilot whales Globicephala melas Traill, 1809 collected from 7 schools caught at different seasons around the Faroe Islands. These and other biological data at our disposal enabled us to confirm and to define more accurately the relations shown previously between age, sex and trace element concentrations in marine mammals. The most striking features were: (1) the elevated levels of Cd and Hg in pilot whales compared to other marine mammals and to minimum adverse-effect levels established for humans; (2) the biocumulative behaviour of Cd and Hg; (3) the high correlations between Hg and Se, predominantly influenced by age; and (4) the high correlations between Cd and Zn, the...
Tipo: Text
Palavras-chave: Marine mammals; Heavy metals; Interactions.
Ano: 1994
URL: http://archimer.ifremer.fr/doc/00196/30766/29149.pdf

In situ kinetics of mercury bioaccumulation in mytilus galloprovincialis estimated by transplantation experiments
Provedor de dados: 5
Autores: Casas, Stellio; Cossa, Daniel; Gonzalez, Jean-louis; Bacher, Cedric; Andral, Bruno.
Monitoring coastal contamination by trace metals pollution using mollusks bivalves as quantitative bioindicators is widely performed in many international biomonitoring programs. For this purpose, studying mercury dynamic in marine mussels is a reliable tool. In situ experiments on uptake and elimination kinetics were conducted in three Mediterranean sites, chosen on the basis of their contamination levels. Mussels were transplanted from a clean area to a highly contaminated one and then transferred back to a clean site. This approach makes it possible to define bioaccumulation factors and uptake and elimination rates consistently with the real environmental conditions.
Tipo: Text
Palavras-chave: Transplantation; Heavy metals; Bioaccumulation; Mytilus galloprovincialis; Bioindicator.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/acte-369.pdf

Lead contamination of small cetaceans in European waters - The use of stable isotopes for identifying the sources of lead exposure
Provedor de dados: 5
Autores: Caurant, Florence; Aubail, A; Lahaye, V; Van Canneyt, O; Rogan, E; Lopez, A; Addink, M; Churlaud, C; Robert, M; Bustamante, Paco.
Lead concentrations and isotopic composition have been measured in bone and teeth of small cetaceans belonging to three species (Delphinus delphis, Phocoena phocoena and Stenella coeruleoalba), to evaluate the toxicological risk and to determine sources of lead in the European waters. Lead concentrations, far lower than threshold value inducing toxic effects in human, were higher in teeth than in bones, but highly correlated between the two tissues (r = 0.92, p &lt; 0.001). Large variations of Pb-206/Pb-207 values in bone tissue showed that cetaceans must be submitted to various atmospheric influences. No geographical differences appeared which is consistent with studies on their distribution indicating seasonal movements between Brittany waters and the...
Tipo: Text
Palavras-chave: Lead; Hard tissues; Heavy metals; Harbour porpoises; Striped dolphins; Common dolphins; Northeast Atlantic; Temporal trends; Biomonitoring.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-1813.pdf

Bioaccumulation of Hg, Cu, and Zn in the Azores triple junction hydrotherinal vent fields food web
Provedor de dados: 5
Autores: Colaco, Ana; Bustamante, Paco; Fouquet, Yves; Sarradin, Pierre-marie; Serrao Santos, R.
In this work, mercury (Hg), copper (Cu) and zinc (Zn) concentrations and tissue distribution are determined in seven benthic invertebrates species (the key species) from the Mid Atlantic Ridge (MAR) hydrothermal vent fields. The samples were collected from three hydrothermal vent fields - Menez Gwen, 840 m;, Lucky Strike, 1700 m and Rainbow, 2300 m - near the Azores Triple Junction. These fields are characterized by different depths, geological context and chemical composition of the hydrothermal fluid, particularly the metal content, which is reflected by the metal concentrations in the organisms. Indeed, our results show that organisms from Menez Gwen presented the highest Hg concentrations, while those from Lucky Strike and Rainbow were richer in Cu and...
Tipo: Text
Palavras-chave: Mid Atlantic Ridge; Trophic relations; Trophic transfer; Biomagnification; Vent ecosystems; Heavy metals.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-2305.pdf

Geographic, seasonal and ontogenetic variation in cadmium and mercury concentrations in squid (Cephalopoda : Teuthoidea) from UK waters
Provedor de dados: 5
Autores: Pierce, G; Stowasser, G; Hastie, L; Bustamante, Paco.
Cadmium (Cd) and mercury (Hg) levels were measured in the tissue samples of two loliginid (Alloteuthis sp. and Loligo forbesi) and two ommastrephid (Todarodes sagittatus and Todaropsis eblanae) squid species collected from research cruise and fishery (market) samples in UK waters during 2004-05. Concentrations of Cd were generally higher in the ommastrephids, in all tissues except muscle. Hg concentrations were higher in T sagittatus than in the loliginids. In L. forbesi, metal concentrations differed between tissues and also varied in relation to body size, geographic origin, and season. Cd levels decreased with increasing body size. This may be related to a shift in the diet with growth, since small L. forbesi feed on benthic invertebrates that have...
Tipo: Text
Palavras-chave: Risk for human consumption; Bioaccumulation; Trace elements; Heavy metals; Cephalopods.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4356.pdf

Heavy metals distribution in mangrove sediments along the mobile coastline of French Guiana
Provedor de dados: 5
Autores: Marchand, Cyril; Lallier Verges, E; Baltzer, F; Alberic, P; Cossa, Daniel; Baillif, P.
The accumulation of nine heavy metals in fine-grained sediments from the mangrove fringed coast of French Guiana is evaluated. The dynamic features of the South American tropical coastline, from the Amazon to the Orinoco Rivers, result in mangrove sediments being alternately submitted to phases of erosion and net sedimentation a few tens of years long. This process influences the distribution of the heavy metals associated with these frequently re-mobilized deposits. Sedimentary cores and mangrove plant samples were collected, at different seasons, in various swamps characterized by different properties (content of sedimentary organic matter, distance from sea water and fresh water). The ranges of measured concentrations expressed in mu mol g(-1) were the...
Tipo: Text
Palavras-chave: French Guiana; Mangrove; Fe/Mn cycling; Heavy metals.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-1041.pdf

Comportement chimique et geochimique des elements a l'état de traces dans l''estuaire de la Seine: Une synthese des resultats
Provedor de dados: 5
Autores: Guegueniat, P.
Five topics are developed in this synthesis: (1) multi elements analysis in geochemistry; (2) iron geochemical behavior; (3) complexing properties of waters; (4) copper behavior in estuarine waters; (5) impact of sediment dynamics on dissolved metals concentration.
Tipo: Text
Palavras-chave: Geographical distribution; Radiochemistry; Brackishwater pollution; Sediment dynamics; Dissolved chemicals; Heavy metals; Geochemistry; Physicochemical properties; Trace elements.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/acte-1290.pdf

Évolution des métaux lourds dans la sédimentation récente de la baie de Fort-de-France (Martinique)
Provedor de dados: 5
Autores: Pujos, Michel; Pons, Jean-claude; Parra, Maria.
Mud progradation of eustatic and to a lesser extent of neotectonic origin began 2000 years ago in the bay of Fort-de-France (Martinique). The terrigenous muds originate from erosion of rocks and soils and cover essentially the inner part of the bay. Recent muds tend of the nineteenth century to the present) are characterized by a sharp enrichment in heavy metals. High concentrations of Ph, Zn and Cu result from a) the rapid development of sugar cane and distilleries about 1880, and b) industrial activities of Fort-de-France region (after the second world war).
Tipo: Text
Palavras-chave: Envasement; Métaux lourds; Quaternaire terminal; Baie de Fort-de-France; Mud progradation; Heavy metals; Late Quaternary; Fort-de-France bay.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/00323/43380/42828.pdf

Biochemical and Mitochondrial Changes Induced by Cd, Fe and Zn in Limnodrillus hoffmeisteri
Provedor de dados: 77
Autores: Grajeda y Ortega,María de los Angeles; Ortiz Ordoñez,Esperanza; Favari,Liliana; Shibayama,Mineko; Silva Olivares,Angélica; López López,Eugenia.
The effects of sublethal concentrations of cadmium (0.64 µg/L), iron (0.043 mg/L) and zinc (0.31 mg/L) and a mixture of these metals on succinate dehydrogenase (SD) and alkaline phosphatase (AP) activity and on structural changes in the mitochondria of epithelium cells of the digestive tract were examined in the oligochaete Limnodrillus hoffmeisteri after 96 h of exposure in artificial sediments. SD activity was significantly inhibited, particularly in treatments with Cd alone (92.57%), while AP increased its activity with Cd alone (73.23%). However, when this metal was mixed with Fe and Zn, the inhibition of SD activity was lower (67.82%) than with Cd alone, showing an antagonistic effect and AP increased its activity (73.26%). Mitochondria were...
Tipo: Journal article
Palavras-chave: Heavy metals; Mixture; Alkaline phosphatase; Succinate dehydrogenase activity; Limnodrillus hoffmeisteri; Epithelium cells; Mitochondria.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000200018

THE ROLE OF COAL COMBUSTION PRODUCTS IN MANAGING THE BIOAVAILABILITY OF NUTRIENTS AND HEAVY METALS IN SOILS
Provedor de dados: 126
Autores: Seshadri,B; Bolan,N.S; Naidu,R; Brodie,K.
Coal provides the primary source of energy for many countries including Asia, South America, North America and Europe, and large quantities of waste products are produced during the combustion of coal in coal-fired power stations. This review paper gives an overview of the various types of coal combustion products (CCPs) and their utilization in various sectors, with a particular emphasis on the role of CCPs in managing the bioavailability of nutrients and heavy metals in relation to enhancing soil chemical fertility and mitigating metal contaminated soils. Currently, CCPs are used extensively in agricultural and construction industries. In agricultural industries, they are used primarily as an amendment to improve the physical and chemical properties of...
Tipo: Journal article
Palavras-chave: Coal; Heavy metals; Combustion products.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162010000100011

MOBILITY AND BIOAVAILABILITY OF HEAVY METALS AND METALLOIDS IN SOIL ENVIRONMENTS
Provedor de dados: 126
Autores: Violante,A; Cozzolino,V; Perelomov,L; Caporale,A.G; Pigna,M.
In soil environments, sorption/desorption reactions as well as chemical complexation with inorganic and organic ligands and redox reactions, both biotic and abiotic, are of great importance in controlling their bioavailability, leaching and toxicity. These reactions are affected by many factors such as pH, nature of the sorbents, presence and concentration of organic and inorganic ligands, including humic and fulvic acid, root exudates, microbial metabolites and nutrients. In this review, we highlight the impact of physical, chemical, and biological interfacial interactions on bioavailability and mobility of metals and metalloids in soil. Special attention is devoted to: i) the sorption/desorption processes of metals and metalloids on/from soil components...
Tipo: Journal article
Palavras-chave: Bioavailability; Heavy metals; Metalloid; Adsorption; Desorption; Chemical speciation.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162010000100005

Análisis de contaminantes inorgánicos tóxicos en las aguas del Rio Almendares, Cuba
Provedor de dados: 20
Autores: Rodríguez, A.J.; Arpajón, I.; Castaño, Z.; Marsán, R.; Lugo, D.; Roevros, N.; Chou, L.; Rojas, N.; Heydrich, M.
The Almendares River constitutes the most important superficial stream in Cuban capital, that finishes in the Metropolitan Park of Havana, which is an entertaining centre. The objective of this work is to determine the presence of toxic inorganic pollutants in the Almendares River water. 10 samplings were carried out from June 2003 to May 2004 in 14 stations established along the last 10 km of the river and 3 tributaries. The quantification of nitrates, nitrites and ammonium was done by spectrophotometric methods The concentration of heavy metals in the dissolved and particulate phase was determined by atomic emission spectrometry. The total microbial charge was determined by epifluorescency. Were found high levels of ammonium and nitrites, as well as high...
Tipo: Proceedings Paper
Palavras-chave: Rivers; Freshwater pollution; Heavy metals; Rivers; Heavy metals; Http://aims.fao.org/aos/agrovoc/c_6617; Http://aims.fao.org/aos/agrovoc/c_2223.
Ano: 2006
URL: http://hdl.handle.net/1834/2086

Distribución del mercurio total en pescados y mariscos del Mar Argentino.
Provedor de dados: 20
Autores: Pérez, A.; Moreno, V.J.; Aizpun, J.E.; Malaspina, A.M.
Fish and shellfish samples for total mercury analysis were provided by the local fish export industry. Data collected through the years 1981-83 are processed and information was obtained on actual total mercury values in edible muscle of sampled species. On the basis of these results, future trends in mercury concentration values are hoped to be predicted. The authors suggest a revision of standards in force at present and the proposal of new ones, taking into account species involved and size of specimens.
Tipo: Journal Contribution
Palavras-chave: Heavy metals; Mercury; Pollution monitoring; Fishery products; Marine fish; Shellfish; Heavy metals; Fishery products; Shellfish; Mercury; Http://aims.fao.org/aos/agrovoc/c_2223; Http://aims.fao.org/aos/agrovoc/c_2941; Http://aims.fao.org/aos/agrovoc/c_7033; Http://aims.fao.org/aos/agrovoc/c_4751.
Ano: 1986
URL: http://hdl.handle.net/1834/2033

Actividad antioxidante del alga Ulva fasciata Delile sometida a distintos niveles de contaminación marina
Provedor de dados: 20
Autores: Hernández, Y.; Laguna, A.; Fernández, M.D.; Valdés, O.; Regalado, E.L.
Ha sido demostrado, por otros autores, que el alga Ulva fasciata Delile posee una actividad antioxidante promisoria y en el presente trabajo evaluamos si la actividad antioxidante de muestras de esta alga puede ser influenciada por la adsorción de metales, pesados y otros por parte del alga. U. fasciata fue colectada en tres zonas de las costas de la Ciudad de la Habana que presentan diferentes niveles de eutrofización: 1) la desembocadura del Río Quibú, un río que atraviesa una importante zona industrial de la capital cubana y en la cual la concentración de metales acumulados por el alga fue mayor; 2) la zona del Malecón habanero, que recibe la contaminación de la bahía de la Habana y del Río Almendares pero no de forma directa, donde presentó valores...
Tipo: Journal Contribution
Palavras-chave: Algae; Marine environment; Heavy metals; Marine environment; Heavy metals; Algae; Http://aims.fao.org/aos/agrovoc/c_4610; Http://aims.fao.org/aos/agrovoc/c_2223; Http://aims.fao.org/aos/agrovoc/c_258.
Ano: 2008
URL: http://hdl.handle.net/1834/2919

Optimización de una red de estaciones marinas para monitoreo en una bahía de bolsa
Provedor de dados: 20
Autores: Arencibia, G.; Capetillo, N.; Castro, M.; Ortega, A.
Las redes de estaciones de monitoreo o muestreos empleadas en estudios ambientales dentro de amplios ecosistemas marinos, como extensas bahías de bolsa, ocasionan enormes gastos económicos y de tiempo en las campañas de muestreo, además de imprecisiones estadísticas que no las hacen representativas. En este trabajo se emplean una serie de criterios que dan basamento para la recomendación de una nueva red de estaciones a partir de estudios previos de metales pesados, hidrocarburos, pesticidas y del bentos, los cuales permiten elaborar una red de monitoreo óptima. Se tuvieron en cuenta criterios diferentes y pruebas estadísticas de análisis multivariado. La red propuesta para estudios de indicadores biológicos del bentos y contaminantes en sedimentos queda...
Tipo: Journal Contribution
Palavras-chave: Multivariate analysis; Sediments; Benthos; Heavy metals; Hydrocarbon analysis; Pesticides.
Ano: 2011
URL: http://hdl.handle.net/1834/4649

Evaluación de las zonas con impacto antrópico del Golfo de Batabanó, Cuba. Empleo de índices de calidad.
Provedor de dados: 20
Autores: Martínez Canals, M.; Montalvo, J. F.; Lugioyo, G.M.; Loza, S.; Pérez, R.
Se realizó la evaluación de los posibles cambios ambientales debido a los impactos antrópicos que han ocurrido en los últimos años en este escenario y la redefinición de áreas que sufren afectaciones, teniendo en cuenta que cualquier alteración ambiental de este ecosistema, ya sea de origen natural o humano, puede tener una importante repercusión económica y social. A partir de los índices químicos y biológicos propuestos, las aguas del Golfo de Batabanó presentaron condiciones mesotróficas con tendencia a la eutrofización en cuatro áreas fundamentales. En los sedimentos del Golfo los valores de carbono orgánico (0.16-7.30 %) y sulfhídrico (12,19-22,90 μg/L) fueron característicos de fondos con altas concentraciones de materia orgánica. En el sector...
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Sediments; Heavy metals; Phytoplankton; Heavy metals; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_2223.
Ano: 2006
URL: http://hdl.handle.net/1834/3340

distribution of phosphorus fractions and some of heavy metals in surface sediments of burullus lagoon and adjacent mediterranean sea
Provedor de dados: 20
Autores: Radwan, A.M.; Khalil, M.K.; El-Moselhy, K.M.
Twelve samples were collected from the surface sediments of lagoon and adjacent Mediterranean Sea. Samples were analyzed for grain size, total organic carbon (TOC), total carbonate (CaCO3), various forms of phosphorus and heavy metals (Fe, Mn, Zn, Cu, Ni, Co, Cd and Pb). The results indicated that the sediments were composed of sand, silt and clay enriched with carbonate (1.95 – 34.1%) and total organic carbon (0.06 and 3.62%). The total-P content ranged between 58 and 1186 μg/g, and the fraction associated with apatite minerals (PHCl) was the dominant (it constitutes about 50 – 73% of TP) implying that it was the main storage of phosphate. The various P phases demonstrated significant positive correlation with mean size, silt, clay, TOC, CaCO3 and TP,...
Tipo: Journal Contribution
Palavras-chave: Field Study; Sediments; Heavy metals; Lagoons; Heavy metals; Http://aims.fao.org/aos/agrovoc/c_2223.
Ano: 2007
URL: http://hdl.handle.net/1834/1888

Evaluación de la tasa fotosintética del alga verde Rhizoclonium riparium (Roth) Kützing ex Harvey, expuesta a cobre y su uso como indicador de contaminación por metales en aguas estuarinas
Provedor de dados: 20
Autores: Montoya, W.; Peña, E.J.; Benítez, R.
Algae have been used as bioindicators by having several advantages such as they have short life cycles, they can take up nutrients directly from water, they are generally easy to collect in sufficient amounts from various habitats; and they readily accumulate compounds present in seawater, making tissue analyses reliable indicators of water quality. In order to evaluate the bioremoval capability of the green alga Rhizoclonium riparium, the photosynthetic responses to heavy metal pollution under different sublethal concentrations of copper was assessed. Photosynthetic rates were significantly low (p &lt;0.05) at low copper concentrations, between (0.01 y 10 mg/l). Maximum photosynthetic values were shown at 30 y 60 mg/l and almost cero at 150 mg/ l of Cu....
Tipo: Conference Material
Palavras-chave: Heavy metals; Biological stress; Algae; Indicator species; Pollution; Bioaccumulation; Copper; Water quality; Estuaries; Heavy metals; Pollution; Bioaccumulation; Copper; Water quality; Estuaries; Algae; Indicator species; Http://aims.fao.org/aos/agrovoc/c_2223; Http://aims.fao.org/aos/agrovoc/c_6077; Http://aims.fao.org/aos/agrovoc/c_32389; Http://aims.fao.org/aos/agrovoc/c_1868; Http://aims.fao.org/aos/agrovoc/c_16061; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_258; Http://aims.fao.org/aos/agrovoc/c_35790.
Ano: 2006
URL: http://hdl.handle.net/1834/2256

Concentrations en métaux toxiques chez Crassostrea gasar (Huître de mangrove) en zone urbaine lagunaire d'Abidjan (Côte d'Ivoire)
Provedor de dados: 20
Autores: Métongo, Bernard Soro.
Cet article présente les résultats relatifs à une étude des concentrations en métaux toxiques (Cd, Cu, Hg et Zn) chez Crassostrea gasar (huître de mangrove). Une étude comparative est faite entre les échantillons collectés en zone urbaine (Abidjan) et ceux des régions rurales (Assini-mafia et Assouindé). Les échantillons collectés en zone urbaine d'Abidjan ont des teneurs en métal plus élevées que ceux de la zone rurale, en raison de la pollution chimique due aux rejets urbains et industriels. Les corrélations polluants-poids des organismes et entre polluants sont assez bonnes.
Tipo: Journal Contribution
Palavras-chave: Correlation analysis; Heavy metals.
Ano: 1991
URL: http://hdl.handle.net/1834/5161

etude quantitative et qualitative des métallothioneines chez la daurade &lt;"Sparus  aurata"&gt; exposée aux metaux lourds
Provedor de dados: 20
Autores: Jebali, J.; Ghedira, J.; Bouraoui, Z.; Ameur, S.; Gherbej, H.; Boussetta, H.
Dans l’environnement marin, les éléments traces peuvent s’accumuler dans les organismes à des concentrations supérieures à celles présentes dans l’eau. L’étude de la distribution tissulaire des métaux traces au niveau des organismes qui y sont exposés, constitue un aspect très important pour la compréhension de leur devenir. En outre, le suivi de la réponse biologique spécifique de ces organismes sentinelles aux xénobiotiques complète et consolide l’analyse chimique. Ce travail vise à étudier la distribution tissulaire des métaux traces et des métallothionéines (MTs) chez la daurade «Sparus aurata » traitée par un métal essentiel (le cuivre) et un métal non essentiel (le cadmium) à une concentration de 500µg /Kg de poids frais pendant 48 heures....
Tipo: Journal Contribution
Palavras-chave: Heavy metals; Pollutants; Heavy metals; Pollutants; Http://aims.fao.org/aos/agrovoc/c_2223; Http://aims.fao.org/aos/agrovoc/c_6076.
Ano: 2009
URL: http://hdl.handle.net/1834/3780

Evaluación de las zonas con impacto antrópico del Golfo de Batabanó, Cuba. Empleo de indices de calidad
Provedor de dados: 20
Autores: Martínez Canals, M.; Montalvo, J.F.; Miravet, M.E.; Lugioyo, M.; Loza, S.; Pérez, R.
The evaluation of the possible environmental changes due to the anthropic impacts that have happened in the last years in this scenario and the redefinition of areas that suffer affectations were carried up. Any environmental alteration of this ecosystem, either of natural or human origin, can have an important economic and social repercussion. According to the proposed chemical and biological indexes, the waters of the Gulf of Batabanó presented mesotrophic conditions with tendency to the eutrofization in four fundamental areas. In the silts of the Gulf the values of organic carbon and sulphidric acid were characteristic of sediments with high concentrations of organic matter. In the coastal sector N, was determinate high concentrations of sulphidric acid...
Tipo: Conference Material
Palavras-chave: Heavy metals; Environmental impact; Coastal waters; Water quality; Man-induced effects; Marine pollution; Heavy metals; Environmental impact; Water quality; Coastal waters; Http://aims.fao.org/aos/agrovoc/c_2223; Http://aims.fao.org/aos/agrovoc/c_24420; Http://aims.fao.org/aos/agrovoc/c_16061; Http://aims.fao.org/aos/agrovoc/c_25205.
Ano: 2006
URL: http://hdl.handle.net/1834/2254

Effects of Heavy Metal and Pollutants on the Non-special Immunity of the Shrimp and Crab.
Provedor de dados: 20
Autores: Ai, Chunxiang; Wang, Xiaojuan; Li, Shaojing; Wang, Guizhong; Lin, Qiongwu.
This paper attempted to review and evaluate existing information about the effects of heavy metal，ammonia-N，nitrite and the organic pollutants on the non-special immune response of the shrimp and crab, which providing theory for improving the self-immunity of shrimp and crab by meliorating cultural environment. In addition, it could provide information for further study on this field.
Tipo: Journal Contribution
Palavras-chave: Immune response; Heavy metals; Pollutants; Crabs; Prawns and shrimps.
Ano: 2008
URL: http://hdl.handle.net/1834/5871

Levantamento Preliminar Dos Resíduos Sólidos Nas Praias Do Sul De Moçambique: Ponta Malongane
Provedor de dados: 20
Autores: Pereira, M.A.M.; de Abreu, D.C.; da Costa, A.C.D.; Louro, C.M.M.
A poluição marinha e costeira em Moçambique é umas das questões ambientais mais preocupantes, não só em termos ecológicos como também em termos económicos. O desenvolvimento da indústria turística, além de benefícios directos para a economia local, regional e até nacional, pode igualmente acarretar aspectos negativos.. como é, por exemplo, o aumento da poluição costeira. O distrito de Matutuíne, Província de Maputo - Sul de Moçambique, apresenta um elevado potencial de desenvolvimento turístico, que.. durante a sua implementação irá, certamente, ser acompanhada por um aumento da poluição das praias por resíduos sólidos, vulgarmente denominados "lixo do turista". … Assim, em Janeiro do presente ano, foi efectuada uma avaliação da composição e quantidade de...
Tipo: Working Paper
Palavras-chave: Marine pollution; Heavy metals.
Ano: 2001
URL: http://hdl.handle.net/1834/281

Distribución de metales pesados (Pb, Cd y Zn) en perfiles de sedimento asociado a Rhizophora mangle en el Río Sevilla - Ciénaga Grande de Santa Marta, Colombia.
Provedor de dados: 20
Autores: Parra, J.P.; Espinosa, L.F.
Con el propósito de evaluar la distribución vertical de metales pesados Pb, Cd y Zn en el sedimento asociado a las plantas de Rhizophora mangle, se determinaron las concentraciones potencialmente biodisponibles y no biodisponibles, en tres perfiles de sedimento colectados en el río Sevilla, Ciénaga Grande de Santa Marta. Las mediciones se hicieron con la técnica de espectrometría de emisión atómica de plasma inductivamente acoplado. Los resultados mostraron que en el ecosistema de manglar del río Sevilla estos metales se acumulan principalmente en formas no biodisponibles, lo cual indica que la mayor parte de estos elementos se encuentran retenidos en el sedimento. La retención del Pb, Cd y Zn en el sedimento de éste ecosistema de manglar está fuertemente...
Tipo: Journal Contribution
Palavras-chave: Heavy metals; Sediments; Heavy metals; Http://aims.fao.org/aos/agrovoc/c_2223.
Ano: 2008
URL: http://hdl.handle.net/1834/3511

Acumulación de metales pesados en microcrustáceos planctónicos provenientes de un embalse contaminado por relaves mineros, embalse Rapel (34° 10' S - 71° 29' W), Chile
Provedor de dados: 20
Autores: Mercado Leal, S.I.
El embalse Rapel, es un cuerpo de agua que está siendo sometido a un fuerte impacto antropogénico, por lo que evidencia severos signos de eutrofización. Esto último debido a que el embalse se ha transformado en el cuerpo receptor de una gran diversidad de efluentes (industriales, agrícolas y domésticos), que evacuan sus descargas sin ningún tipo de tratamiento. A lo cual se le debe agregar la recepción de aguas provenientes de los relaves de la mina de cobre “El Teniente”. Con el objetivo de determinar la presencia y acumulación de metales pesados en el agua y en los organismos zooplanctónicos, durante el mes de Octubre del 2003 se tomaron muestras de agua y de ejemplares de Ceriodaphnia dubia, Bosmina chilensis y Diaptomus diabolicus. Como especies...
Tipo: Theses and Dissertations
Palavras-chave: Heavy metals; Freshwater pollution; Water reservoirs; Water analysis; X-ray spectroscopy; Zooplankton; Man-induced effects.
Ano: 2004
URL: http://hdl.handle.net/1834/4899

Impact saisonnier de l'environnement sur la structure génétique de trois populations de ruditapes decussatus dans l'ecosystème lagunaire de Bizerte (Tunisie)
Provedor de dados: 20
Autores: Fassatoui, CH.; Mdelgi-Lasram, E.; Moraga, D.; Romdhane, M.S.
في محاولة لتقييم تأثيرالاضطرابات التي يمكن ان تغير التركيبه الجينيه للمحار ببحيره بنزرت، اجريت تحاليل جينيه على عينات من ثلاثة مجموعات. و قد بينت النتائج تواجد علاقة متبادله بين فقدان التنوع ومستويات métallothionéines في خياشيم المحار التي  يمكن ان تكون مرتبطة مع وجود تدرج الانسياب المحمل بالمعادن الثقيلة بين مناطق منزل جميل،فروة والشعرة.
Tipo: Journal Contribution
Palavras-chave: Ruditapes decussatus; Clam culture; Environmental effects; Environmental impact; Heavy metals; Metallothioneins; Population genetics; Toxicity; Environmental impact; Heavy metals; Population genetics; Toxicity; Biomarkers of exposure (organisms); Http://aims.fao.org/aos/agrovoc/c_24420; Http://aims.fao.org/aos/agrovoc/c_2223; Http://aims.fao.org/aos/agrovoc/c_34326; Http://aims.fao.org/aos/agrovoc/c_7826; Http://aims.fao.org/aos/agrovoc/c_36994.
Ano: 2007
URL: http://hdl.handle.net/1834/4258

Metodología de bioensayos y efectos tóxicos de algunos contaminantes sobre organismos de interés ecológico pesquero
Provedor de dados: 20
Autores: Suárez Álvarez, G.
Este trabajo trata de presentar los efectos tóxicos de cuatro posibles contaminantes de la plataforma cubana, un plaguicida órgano clorado el DDT y 3 metales, el cromo, el cobre y el plomo, sobre postlarvas de langosta P. argus y el camarón P. notialis. Persiguiendo un triple propósito en sus objetivos, presentar de una forma cómoda, con fines didácticos la resolución de los tres métodos de trabajo adoptados internacionalmente para evaluar la toxicidad, el método gráfico semi logarítmico, rutinario o estándar, el método de los Probits de Bliss y la modificación de Licthfield y wilcoxon, así como analizar de dichas metodologías cual es la más adecuada para la evaluación de los efectos de cualquier contaminante con mayor precisión estadística y conocer los...
Tipo: Theses and Dissertations
Palavras-chave: Toxicity; Heavy metals; Metals; Toxicity; Heavy metals; Metals; Http://aims.fao.org/aos/agrovoc/c_7826; Http://aims.fao.org/aos/agrovoc/c_2223; Http://aims.fao.org/aos/agrovoc/c_29036.
Ano: 1996
URL: http://hdl.handle.net/1834/2610

Heavy metals concentrations in certain tissues of five commercially important fishes from El-Mex Bay, Alexandria, Egypt
Provedor de dados: 20
Autores: Khaled, A.
The distribution of eight heavy metals (Cd, Cr, Cu, Fe, Mn, Ni, Pb nd Zn) were detected in muscles, gills, livers and bones of five fish species namely, Sargus sargus, Siganus rivulatus, Mugil cephalus, Caranx crysos and Scomberomorus commerson collected from El-Mex Bay, Alexandria during January 2003. Iron and zinc were most abundant in all fish tissues under investigation. Iron, zinc and copper recorded highest concentration levels in liver while cadmium, cromium and lead recorded their highest values in gills and bones. Provisional Tolerable Weekly Intake (PTWI) demonstrated that the concentration of metals (Cd, Cu, and Pb) in muscles of the five fishes are lower than the PTWI values, and accordingly there is no risk yet for human consumption of flesh...
Tipo: Journal Contribution
Palavras-chave: Heavy metals; Pollution; Fish; El-Mex Bay; Alexandria; Egypt Accumulation Fish consumption.
Ano: 2004
URL: http://hdl.handle.net/1834/1086

Diversidad de peces demersales en la plataforma continental del Ecuador
Provedor de dados: 20
Autores: Moncayo, D.; Trejos, R.; Maridueña, A.; Castro, R.
Se determine el contenido de Mercurio (Hg), Cadmio (Cd) y Plomo (Pb) en 18363 muestras de productos pesqueros colectadas durante el período enero del 2006 hasta julio del 2009. La determinación fue realizada empleando espectrofotometría de Absorción Atómica por generación de vapor frío (Hg) y horno de grafito (Cd y Pb), todas las concentraciones son expresadas en peso húmedo. Los análisis fueron realizados con el propósito de verificar que los productos pesqueros a ser exportados cumplen con los niveles establecidos en el Reglamento consolidado (CE)N°1881/2006, de la Unión Europea, que fija el conte¬nido máximo de determinados contaminantes en los productos alimenticios. Las concentraciones encontradas, en las muestras de peces, en su mayoría fueron...
Tipo: Journal Contribution
Palavras-chave: Heavy metals; Atomic absorption spectroscopy; Bioaccumulation; Pollution effects; Fishery products.
Ano: 2010
URL: http://hdl.handle.net/1834/4802

Contenido de Cu, Co, Cr y Pb en sedimentos de tres estuarios de la costa sur de Cuba
Provedor de dados: 20
Autores: Arencibia Carballo, G.; Perigó, E.; Sosín, A.
The many fishing activities of the south area of the Counties Sancti Spíritus and Ciego de Ávila they are enough reason to make studies of levels of toxic elements in the silts. The obtained results of the determination of Cu, Co, Cr and Pb in silts of the estuaries and rivers Agabama, Zaza and Jatibonico of the South are discussed and compared. They are also related these elements with the percentage of volatile matter in the silts. These tributary of the south coast, nevertheless to be in the same line of coast of about 200 Km presents remarkable differences as for their relationships with urban populations, industries and agricultural works. The technique employee for determination of the concentrations of the metallic elements was the espectrofotometry...
Tipo: Journal Contribution
Palavras-chave: Marine pollution; Heavy metals; Spectrochemical analysis; Sediments; Heavy metals; Http://aims.fao.org/aos/agrovoc/c_2223.
Ano: 1988
URL: http://hdl.handle.net/1834/1882

The anthropogenic effluents of the human activities on the red sea coast at hurghada harbour (case study)
Provedor de dados: 20
Autores: Madkour, H.A.; Dar, M.A.
The heavy metal accumulations in the seawater, coral reefs and two effective fractions of underlying sediments (&lt;0.125mm and &lt; 0.063mm) were studied in the coastal and tidal flat zones at the main shipyard near of Hurghada Harbour. The area of investigation is very worse whereas, it is considered tailing outlet for both solid and liquid influents of many human activities in/and surrounding the harbour. The solid phases are of construction remains, paint remains, iron pipe rusts, hydrocarbons, plastic bags, metal and wood remains as well as the artificially conglomerate stones that thrown in the in the marine area. The liquid phase is restricted in the continuous brine water draining to the sea from a huge desalination plant (Capacity 5000 cubic...
Tipo: Journal Contribution
Palavras-chave: Environmental Study; Sediments; Sea water; Coral reefs; Heavy metals; Coral reefs; Heavy metals; Sea water; Http://aims.fao.org/aos/agrovoc/c_1880; Http://aims.fao.org/aos/agrovoc/c_2223; Http://aims.fao.org/aos/agrovoc/c_6903.
Ano: 2007
URL: http://hdl.handle.net/1834/1890

Determinación del contenido de metales pesados en las fracciones geoquímicas del sedimento superficial asociado a los manglares de la Ciénaga Grande de Santa Marta, Colombia
Provedor de dados: 20
Autores: Espinosa, Luisa Fernanda; Parra, Juan Pablo; Villamil, Carlos.
El ecosistema de manglar de la Ciénaga Grande de Santa Marta (CGSM) ha estado sometido a fuertes presiones antropogénicas que han ocasionado, entre otros, cambios en las características fisicoquímicas de sus sedimentos. En condiciones normales, los sedimentos asociados al manglar generan equilibrios que permiten la retención de metales pesados en distintas formas químicas, al romperse este equilibrio los metales que no son retenidos en la matriz sedimentaria, pueden ser removilizados y hacerse biodisponibles. Con el propósito de establecer el potencial de movilidad y biodisponibilidad  de los metales Cr, Mn, Ni, Cu, Zn, Cd, As y Pb en sedimentos superficiales asociados al manglar en la CGSM, se analizaron sus contenidos en cuatro áreas con diferente grado...
Tipo: Journal Contribution
Palavras-chave: Heavy metals; Sediments; Bioavailability.
Ano: 2011
URL: http://hdl.handle.net/1834/4379

Caractérisation préliminaire à partir de la lagune de Bizerte (Tunisie) des bactéries tolérantes aux hydrocarbures aromatiques polycliques (HAPS)
Provedor de dados: 20
Autores: Duran, R.; El Bour, M.; Ben Said, O.; Goni, M. S.; Dalleli, M.; Aissa, P.
م إنجاز هذه الدراسة  لهدف عَزَلَ بَكْتِيريَا قادرة على استعمالتم إنجاز هذه الدراسة  لهدف عَزَلَ بَكْتِيريَا قادرة على استعمال الهيدروكربنات و مقاومة للمعادن والمضادات الحيوية و في هذا الإطار  تم أخذ عينات من الماء و التربة على مستوى  16محطة موزعة ببحيرة بنزرت. كما تم عزل البكتيريا بطريقة الإثراء  باستعمال وسط مائي معدني زائد هيدروكربنات (fluoranthène) وقد توصلنا في عملية أولية من عزل 130  من الأجذال المختلفة من البكتيريا والتي تم تعريفها عبر الخاصيات  الشكلية و البيوكيميائية. وأثبتت  النتائج الأولية أن البكتيريا القادرة على استعمال الهيدروكربنات تنتمي لمجموعات مختلفةGram – و  Gram+  على التَّوَالِي بنسبتي 65% و 35 %. وتضم مجموعة البكتيريا من نوع العصيات  Gram – أكبر عدد من الأجذال المعزولة (74 %). ختاما نشير أن دراسة قدرة الأجذال على مقاومة المعادن...
Tipo: Journal Contribution
Palavras-chave: Bacteria; Antibiotics; Biodegradation; Control resistance; Heavy metals; Hydrocarbons; Pollution monitoring; Antibiotics; Biodegradation; Heavy metals; Hydrocarbons; Http://aims.fao.org/aos/agrovoc/c_492; Http://aims.fao.org/aos/agrovoc/c_9261; Http://aims.fao.org/aos/agrovoc/c_2223; Http://aims.fao.org/aos/agrovoc/c_3719.
Ano: 2007
URL: http://hdl.handle.net/1834/4257

Concentrations en mercure dans les muscles de thon Albacores (Thunnus albacares) du Golfe de Guinée (1987-1988)
Provedor de dados: 20
Autores: Métongo, B.S.; Kouamenan, K.F.
Des échantillons de thons albacores (Thunnus albacares) pêchés dans l'Atlantique tropical Est ont été analysés en vue de la détermination de mercure dans les muscles blanc et rouge. Les résultats des dosages montrent qu'il n'y a pas de différence significative entre les teneurs en mercure dans les deux types de muscles. En outre, les concentrations observées dans le muscle blanc sont comparables à celles obtenues par Aldrin et al. en 1973. Il est donc probable que les concentrations de mercure observées soient liées à des phénomènes naturels plutôt qu'à des contaminations d'origine anthropogénique. A titre comparatif, trois échantillons d'espadons (Xiphias gladius) ont été également analysés. Les résultats montrent que les teneurs dans les muscles...
Tipo: Journal Contribution
Palavras-chave: Muscles; Heavy metals.
Ano: 1991
URL: http://hdl.handle.net/1834/5160

Bioaccumulation of mercury in some marine organisms from Lake Timsah and Bitter Lakes (Suez Canal, Egypt)
Provedor de dados: 20
Autores: El-Moselhy, K.M.
The present work is devoted to determine the level of total mercury in the different tissues of fish Mugil seheli, crab Portunus pelagicus, shrimp Metapenaeus stebbingi, and bivalves Paphia undulata and Gafrarium pectinatum collected from Lake Timsah and Bitter Lakes during spring 2003. In addition, factors affecting the accumulation of mercury in these organisms were studied. Levels of Hg in the edible parts of the investigated organisms showed the ranges 2.62 – 25.45 and 0.94 – 7.94 ng/g wet wt. in fish, 16.02 – 117.26 and 9.86 – 64.18 ng/g wet wt. in crab, 4.55 – 14.67 and 5.76 – 15.58 ng/g wet wt. in shrimp, and 1.06 – 36.31 and 5.38 – 69.59 ng/g wet wt. in bivalves from Lake Timsah and Bitter Lakes, respectively. High accumulation of Hg was recorded...
Tipo: Journal Contribution
Palavras-chave: Chemistry Studies; Mercury; Bioaccumulation; Marine organisms; Heavy metals; Bioaccumulation; Mercury; Http://aims.fao.org/aos/agrovoc/c_32389; Http://aims.fao.org/aos/agrovoc/c_4751.
Ano: 2006
URL: http://hdl.handle.net/1834/1451

Assessment of heavy metals and nonessential content of some edible and soft tissues
Provedor de dados: 20
Autores: Ahdy, H.H.H.; Abdallah, A.M.; Tayel, F.T.
The level concentrations of heavy metals (essential and nonessential) were measured in different marine biota including cephalopoda, bivalve, crustacean and fish. The results reveal that these organisms show more or less the same order of distribution for each of the metals studied. The average concentrations of heavy metals exhibited the following decreasing order: cephalopoda &gt; bivalve &gt; crustacean &gt; fish. The levels of metals in all studied samples are still comparable to those in their corresponding in the Mediterranean Sea. K (98-181μg/g) and Ca (547-1472 μg/g) were present at the highest concentrations in all investigated samples. Octopus and Sepia do not follow the general pattern. The highest value of Metal Pollution Index (MPI) in...
Tipo: Journal Contribution
Palavras-chave: Field Study; Heavy metals; Marine crustaceans; Fish; Heavy metals; Fish; Http://aims.fao.org/aos/agrovoc/c_2223; Http://aims.fao.org/aos/agrovoc/c_15903.
Ano: 2007
URL: http://hdl.handle.net/1834/1898

Impacto de los metales contaminantes en la calidad de la tilapia ( oreocromis aureus) cultivada en Cuba
Provedor de dados: 20
Autores: Pis Ramírez, M.A.
Se evaluó el impacto producido por los metales traza sobre ecosistemas acuáticos dedicados al cultivo de peces para la alimentación de la población, a través de la realización de estudios de determinación de los niveles de Pb; Cd; Hg; Fe; Cu; y Zn en el agua, sedimento y tilapias de tres presas de interés comercial para el país; dos situadas en la Ciudad de la Habana (Paso Seco y Niña Bonita) y una en Villa Clara (Palmarito). Los resultados obtenidos mostraron niveles de Pb en agua y de Hg, Pb y Cd en el sedimento de las presas que denotaron contaminación de origen antropogénico, lo que trajo como consecuencia que las tilapias cultivadas presentaran en muchos casos niveles de metales traza tóxicos por encima de los límites máximos permisibles en las normas...
Tipo: Theses and Dissertations
Palavras-chave: Heavy metals; Sample contamination; Freshwater aquaculture; Heavy metals; Http://aims.fao.org/aos/agrovoc/c_2223.
Ano: 1999
URL: http://hdl.handle.net/1834/2869

Seasonal concentrations of some heavy metals in muscle tissues of Siganus rivulatus and Sargus sargus fish from El-mex bay and eastern harbour, Alexandria, Egypt
Provedor de dados: 20
Autores: Khaled, A.
The concentration of seven heavy metals (Cd, Cu, Fe, Mn, Ni, Pb and Zn) were detected seasonally in muscle tissues of two fish species (Siganus rivulatus, Sargus sargus) collected from El-Mex Bay and Eastern Harbour. In both species, levels of the seven metals were significantly higher in summer compared with other seasons. The concentrations of such metals decreased in the order Fe &gt; Zn &gt; Cu &gt; Ni ≥ Pb &gt; Mn &gt; Cd. The metal pollution index (MPI) for the two species fluctuated between 0.9 and 1.8 in El-Mex and Eastern Harbour. Provisional Tolerable Weekly Intake (PTWI) demonstrates that the concentration of the metals (Cd, Cu and Pb) in the muscle of Siganus rivulatus and Sargus sargus from El-Mex Bay and Eastern Harbour are much lower than...
Tipo: Journal Contribution
Palavras-chave: Accumulation; Biological data; Cadmium; Marine environment; Marine fish; Heavy metals; Marine environment; Cadmium; Http://aims.fao.org/aos/agrovoc/c_4610; Http://aims.fao.org/aos/agrovoc/c_1178.
Ano: 2004
URL: http://hdl.handle.net/1834/1149

Determinación experimental del límite de detección, en el análisis de metales pesados en organismos marinos, por espectrofotometría de absorción atómica
Provedor de dados: 20
Autores: Moreno, V.J.; Pérez, A.
The determination limit is defined as the minimum concentration of a substance in a sample that can be distinguished from the background with a given probability, using a particular analytical method. It is assumed that the concept of detention can be used satisfactorily to quality an analytical method. Some criteria which are necessary for intercalibration purpose are given in this paper. An algebraic method to calculate the detection limit easily and with minimum experimental work was developed. A method to determine the number of repetitions needed when the levels of the analyzed substance are near or under the detection limit of the method is also shown.
Tipo: Journal Contribution
Palavras-chave: Heavy metals; Spectroscopic techniques; Marine organisms; Heavy metals; Http://aims.fao.org/aos/agrovoc/c_2223.
Ano: 1984
URL: http://hdl.handle.net/1834/2051

Contenidos de Cadmio, Cobre, Zinc y Plomo en órganos de Rhizophora mangle de la Ciénaga Grande de Santa Marta, Caribe colombiano.
Provedor de dados: 20
Autores: Naranjo-Sánchez, Y.A.; Troncoso-Olivo, W.
Para determinar los contenidos de cadmio, cobre, zinc y plomo en hojas, tallos y raíces de Rhizophora mangle se tomaron muestras en tres parcelas ubicadas en la desembocadura del río Sevilla-Ciénaga Grande de Santa Marta, en octubre de 2003. Las mediciones de las concentraciones de metales, se hicieron mediante la técnica de espectrometría de emisión atómica de plasma inductivamente acoplado (ICP-AES). Los resultados indicaron que la concentración de plomo en órganos de R. mangle estuvo bajo el límite de detección del método utilizado (&lt;2.38 μg/g), a excepción de las raíces absorbentes (16.3 μg/g); y que existen diferencias significativas en los contenidos de cadmio, cobre y zinc entre órganos de R. mangle, encontrándose el siguiente orden de...
Tipo: Journal Contribution
Palavras-chave: Mangroves; Heavy metals; Heavy metals; Mangroves; Http://aims.fao.org/aos/agrovoc/c_2223; Http://aims.fao.org/aos/agrovoc/c_16190.
Ano: 2008
URL: http://hdl.handle.net/1834/3502

Distribution and relationships of heavy metals in the giant clam (Tridacna maxima) and associated sediments from different sites in the Egyptian Red Sea Coast
Provedor de dados: 20
Autores: Madkour, H.A.
The giant clam (Tridacna maxima) and sediments have been collected from clean and contaminated coastal sites of the Egyptian Red Sea. Selected samples of the giant clam shells and the associated surface sediments were analyzed for Fe, Mn, Zn, Cu, Pb, Ni and Cd. Significant spatial differences in metal concentrations in Tridacna maxima and sediments were identified. Copper and lead are greatly enriched in the giant clam shells, which is related to their physiological function. Cd content is higher in Tridacna maxima than in sediments, because of the easy substitution between Cd and Ca. The levels of most metals in the giant clam shells and sediments were higher in the anthropogenic sites than in the uncontaminated sites. Generally, metal variations reflect...
Tipo: Journal Contribution
Palavras-chave: Bioaccumulation; Heavy metals; Giant clam; Tridacna; Red Sea Accumulation Chemical analysis Clam culture Absorption http://aims.fao.org/aos/agrovoc/c_27.
Ano: 2005
URL: http://hdl.handle.net/1834/1307

Distribución de metales en sedimentos costeros del golfo de Guacanayabo
Provedor de dados: 20
Autores: Arencibia Carballo, G.; Isaac, M.; González, H.
Of great importance to our country economy in the coastal zone running along the Gulf of Guacanayabo because of the different species nurseries having commercial interest. Studies on Al, Pb, Zn, and Cu contents within the surface sediments along 210 km of coastal areas, where 42 stations were located are carried out in the work. Results obtained are used for distribution analysis of elements within the zone and their relationships with the domestic and industrial population groups.
Tipo: Journal Contribution
Palavras-chave: Heavy metals; Sediments; Coastal zone; Heavy metals; Http://aims.fao.org/aos/agrovoc/c_2223.
Ano: 1988
URL: http://hdl.handle.net/1834/1883

Estructura de las comunidades de la meiofauna de la Bahía de Nipe, Cuba
Provedor de dados: 20
Autores: Cuervo, Z.; Armenteros, M.; Capetillo, N.; Arencibia, G.; Pérez, I.; González, G.
The structure of meiofaunal communities was surveyed in 17 stations in Nipe Bay, Cuba in July, 2001. Levels of Nickel (all stations) are higher than in several bays in Cuba, probably due to natural causes. The levels of Copper, Zinc, Fe and Manganese indicate a relative low pollution, likely related to the presence of urban settlements. There is decrease in the total density and number of taxa of meiofauna in the stations with higher levels of metals; the copepods appear to be particularly sensitivity to metal pollution. The stations located at the mouth of the bay have the lowest levels of contamination and the highest total density of organisms and taxa richness, probably due to a more intense turnover of the waters in this area and consequent lower...
Tipo: Proceedings Paper
Palavras-chave: Heavy metals; Meiofauna; Meiobenthos; Heavy metals; Meiobenthos.
Ano: 2006
URL: http://hdl.handle.net/1834/2173

Etude d’impact des métaux traces (Hg, Cd, Pb, Cu et Zn) dans les cystes et la biomasse "d’Artemia" exploités dans la saline de Sfax
Provedor de dados: 20
Autores: Aloui, N.; Amorri, M.; Choub., L.
RESUME La saline de Sfax constitue un site potentiel pour l’exploitation et la production de l’Artemia locale. Des quantités importantes d’Artemia sont exploitées chaque année (60 kg de cystes poids sec) et sont utilisées en alimentation larvaire.  Afin de démontrer l’impact de divers rejets industriels, agricoles dans cette saline, nous avons procédé à la détermination de quelques métaux traces toxiques : le mercure (Hg), le cadmium (Cd), le plomb (Pb), le cuivre (Cu) et le zinc (Zn) par une analyse en spectrophotométrie  d’absorption atomique, ce qui nous permettra d’évaluer le degré de contamination par ces métaux dans les cystes et la biomasse d’Artemia.  Les résultats obtenus ont montré que les concentrations aussi bien au niveau des cystes que de la...
Tipo: Journal Contribution
Palavras-chave: Aquatic pollution; Artemia culture; Artemia; Heavy metals.
Ano: 2010
URL: http://hdl.handle.net/1834/4729

XRF analysis of sediments from Nuevitas Bay (Cuba):   assessment of current heavy metal contamination
Provedor de dados: 20
Autores: Díaz Rizo, O.; Rudnikas, A. G.; Lavin Pérez, R. D.; Arencibia Carballo, G.; D´Alessandro Rodríguez, K.
Concentrations of chromium, nickel, copper, zinc and lead in surface sediments from six sta- tions located in Nuevitas Bay (Cuba) were estimated by X-ray fuorescence analysis. The Cr  content in sediments shows a strong variation across the studied stations (89-513 mg.kg-1 ),  in contrast with the other elements studied. The application of modifed degree of contamina- tion (mCd) classifes as moderate the contamination of Nuevitas Bay. The comparison with Se- diment Quality Guidelines and toxicity mean quotients shows that 100 % of the Sediments  are associated with the occasional presence of possible adverse effects to human health.
Tipo: Journal Contribution
Palavras-chave: Pollution control; X-ray fluorescence analysis; Heavy metals.
Ano: 2014
URL: http://hdl.handle.net/1834/5763

Les déchets miniers phosphatés source de la pollution marine au Togo
Provedor de dados: 20
Autores: Gnandi, K.
L'impact environnemental du rejet dans la mer des déchets miniers issus du traitement des phosphates de Hahotoké-Kpogamé(Togo) a été étudié dans ce manuscrit. Les résultats des analyses chimiques rnontrent de fortes concentrations des éléments Cd (2-44 mg/kg), Cr (1 15-753 mg/kg), Cu (22-184 mg/kg), Ni (19-281 mg/kg), V (38-329 mg/kg), Sr (179-643 mg/kg), Pb (22-176 nig/kg), Zn (60-632 mgikg) et du Zr (18-8928 mg/kg) dans la fraction &lt; 63 um des sédiments marins côtiers. Les concentrations du Cd diminuent du grain grossier (silte) au grain fin (argile), alors que celles du Cr, Cu, Ni, V, Sr, Zn et Pb augmentent lorsque la granulométrie évolue vers le grain fin. Les phénomènes de transport par les courants littoraux, de tri par densité et de...
Tipo: Journal Contribution
Palavras-chave: Marine pollution; Phosphates; Heavy metals; Togo; Phosphates; Http://aims.fao.org/aos/agrovoc/c_7801; Http://aims.fao.org/aos/agrovoc/c_35986.
Ano: 2002
URL: http://hdl.handle.net/1834/1442

Heavy metals distribution of soils around mining sites of cadmium-rich marine sedimentary phosphorites of Kpogamé and Hahotoé (Southern Togo)
Provedor de dados: 20
Autores: Gnandi, K.; Tobschall, H.J.
Metal concentrations of 37 soil samples taken from mining areas (abandoned mine pits and transport routes) in Kpogamé and Hahotoé (southern Togo) range from 0.2-43 ppm for Cd, 15-115 ppm for Pb, 182-1,029 ppm for Cr, 18-356 ppm for Cu, 15-342 pm for Ni, 90-513 ppm for V, 35-536 ppm for Zn, 80-469 ppm for Zr and 266-3,161 ppm for Sr. The tropical alteration of the ore waste plays an important role in the distribution of trace elements in the studied soils. Because the alteration affects the element mobility, generally old abandoned mining areas, which , together with soils near the transport routes, show a higher degree of contamination. Under low pH and oxidising conditions in studied soils Cd, Ni and Zn are generally easily mobilised and are thus...
Tipo: Journal Contribution
Palavras-chave: Heavy metals; Mining; Phosphorite; Pollution; Heavy metals; Pollution; Http://aims.fao.org/aos/agrovoc/c_2223; Http://aims.fao.org/aos/agrovoc/c_6077.
Ano: 2002
URL: http://hdl.handle.net/1834/2715

Heavy metal contaminants in some Nigerian marine fishes of commercial importance
Provedor de dados: 20
Autores: Sadik, O. A.
Trace metal levels were determined in tissues of eleven species of marine fishes of commercial importance and in water and sediments taken from six sites located along the Nigerian Coastal waters.  The Study was undertaken to determine the occurrence and the levels of cadmium, nickel, lead, mercury and zinc in fish tissues, water and sediments, and to establish a baseline data to which future studies on the levels of this metals could be referred.  The total concentrations of each element in the samples were determined without regard to chemical form.  Mean levels of each element are presented to relation to the number of species examined.  More detailed analytical data on these elements are given with reference to tissue analysed, size range of fish and...
Tipo: Report
Palavras-chave: Heavy metals; Water pollution; Heavy metals; Water pollution; Http://aims.fao.org/aos/agrovoc/c_2223; Http://aims.fao.org/aos/agrovoc/c_8321.
Ano: 1990
URL: http://hdl.handle.net/1834/2429

Distribution of vanadium in bottom sediments from the marine coastal area of the Egyptian seas
Provedor de dados: 20
Autores: El-Moselhy, K.M.
The present study aims to measure the concentration of vanadium in 73 sediment samples collected along the coastal area of the Egyptian seas (Mediterranean and Red Seas). The results indicated that the mean value of vanadium in Red Sea sediments (52.61 µg/g) was higher than the mean value of the Mediterranean (40.58 µg/g) and the variation between the two means was insignificant (p = 0.241). This result could be attributed to the high petroleum activities of the Red Sea. Along the Mediterranean coast, the sector in front of Port Said area exhibited the highest mean value of vanadium (103.9 µg/g) than other sectors, which suffers from many sources of pollution. While the highest mean value along the Red Sea coast (73.20 µg/g) was found at the sector of Red...
Tipo: Journal Contribution
Palavras-chave: Chemistry analysis of sediments; Sediment analysis; Vanadium; Marine sedimentation; Heavy metals; Vanadium.
Ano: 2006
URL: http://hdl.handle.net/1834/1447

Distribución del mercurio total en los tejidos de un delfín nariz de botella (Tursiops gephyreus Lahille, 1908) de la provincia de Buenos Aires (Argentina)
Provedor de dados: 20
Autores: Malaspina, A.M.; Pérez, A.; Moreno, V.J.; Bastida, R.O.; Aizpun, J.E.
Samples of seventeen different tissues of one specimen of the bottlenose dolphin Tursiops gephyreus, caught accidentally in waters adjacent to Mar del Plata by local fishermen (38°00'S; 57°20'W), were analyzed for total mercury distribution. The analytical procedure employed for total mercury involved a wet acid digestion followed by flameless atomic absorption. The method was based essentially on the one proposed by Armstrong and Uthe (1971).
Tipo: Journal Contribution
Palavras-chave: Heavy metals; Mercury; Methodology; Aquatic mammals; Heavy metals; Mercury; Methodology; Http://aims.fao.org/aos/agrovoc/c_2223; Http://aims.fao.org/aos/agrovoc/c_4751; Http://aims.fao.org/aos/agrovoc/c_12522.
Ano: 1984
URL: http://hdl.handle.net/1834/2050

Etude saisonnière de la contamination métallique des  macroalgues de la lagune nord de Tunis
Provedor de dados: 20
Autores: Chouba, L.; Ajjabi-Chebil, L.; Herry, S.
Dans le but de démontrer la capacité de bioaccumulation métallique des macroalgues et sa variation temporelle, on s’est intéressé à la détermination de la gamme de concentrations en métaux traces (Plomb, Cadmium, Fer, Manganèse et Zinc) dans trois macroalgues vertes (Ulva rigida, Chaetomorpha linum, Caulerpa prolifera) au niveau de la lagune nord et du canal de navigation de Tunis sujettes à d’importants rejets anthropiques. Des collectes saisonnières ont été faites dans la lagune de Tunis durant la période d’avril 2009 au février 2010. Les teneurs métalliques déterminées par spectrophotométrie d’absorption atomique ont montré des variations significatives selon l’espèce et la saison de prélèvement. Les résultats ont montré que les teneurs en différents...
Tipo: Journal Contribution
Palavras-chave: Heavy metals; Algae; Seaweeds; Bioaccumulation; Green algae.
Ano: 2010
URL: http://hdl.handle.net/1834/4733

Determination of P, Ca, Zn, Cd and Pb concentrations in muscle, gills, liver, gonads and skeleton of two natural populations of &lt;Atherina lagunae&gt; in north lake of Tunis (Tunisia)
Provedor de dados: 20
Autores: Ayed, N.; Faure, E.; Quignard, J.P.; Trabelsi, M.
In this study, zinc (Zn), cadmium (Cd), lead (Pb), phosphorus (P) and calcium (Ca) concentrations in muscle, gills, liver, gonads and skeleton of two naturals populations of sand smelt Atherina lagunae (Teleostean, Atherinidae) normal and deformed, as well as bioaccumulation of these elements from the water and the sediment in the North Tunis Lake were investigated. The analysis of calcium was performed with flame atomic absorption spectrometry. The average concentrations of Ca in the different tissues analyzed show higher values in healthy atherines except in gonads where the average concentration of Ca in deformed atherines significantlyexceeds that in normal atherines (p &lt;0.05) and the Ca spine concentrations where the similar in the two populations....
Tipo: Journal Contribution
Palavras-chave: Heavy metals; Calcium; Phosphorus.
Ano: 2013
URL: http://hdl.handle.net/1834/5906

Structure trophique des peuplements de  nématodes libres marins dans un milieu expérimentalement enrichi en cadmium et/ou en hydrocarbures (diesel)
Provedor de dados: 20
Autores: Mahmoudi, E.; Essid, N.; Beyrem, H.; Hedfi, A.; Boufahja, F.; Aissa, P.; Vitiello, P.
Une étude en microcosme a été entreprise pour examiner l’influence d’un métal lourd (le cadmium) et/ou du diesel sur la structure trophique d’une communauté de nématodes libres provenant de la lagune de Ghar El Melh (Tunisie). Trois doses en cadmium [faible : 0,54 mg Cd kg-1 (poids sec, ps), moyenne : 0,90 mg Cd kg-1 (ps) et forte : 1,40 mg Cd kg-1(ps)], une dose de diesel de 0,25 mg kg-1 (ps) et un mélange de cadmium et de diesel [1,40 mg Cd kg-1(ps) + 0,25 mg  kg-1 de diesel (ps)] ont été testées pour évaluer les effets de ces polluants après 90 jours d’exposition. Les résultats des analyses statistiques univariées n’ont montré aucune différence significative pour la plupart des indices des communautés traitées par rapport à l’assemblage témoin. Ainsi,...
Tipo: Journal Contribution
Palavras-chave: Nematoda; Cadmium; Chemical pollution; Heavy metals; Microcosms; Pollution effects; Trophic structure; Heavy metals; Cadmium; Http://aims.fao.org/aos/agrovoc/c_2223; Http://aims.fao.org/aos/agrovoc/c_1178.
Ano: 2005
URL: http://hdl.handle.net/1834/3740

Etude quantitative et qualitative des métallothioneines chez la daurade "Sparus  aurata" exposée aux métaux lourds
Provedor de dados: 20
Autores: Ameur, S.; Ghedira, J.; Guerbej, H.; Jebali, J.; Bouraoui, J.; Boussetta, H.
Dans l’environnement marin, les éléments traces peuvent s’accumuler dans les organismes à des concentrations supérieures à celles présentes dans l’eau. L’étude de la distribution tissulaire des métaux traces au niveau des organismes qui y sont exposés, constitue un aspect très important pour la compréhension de leur devenir. En outre, le suivi de la réponse biologique spécifique de ces organismes sentinelles aux xénobiotiques complète et consolide l’analyse chimique. Ce travail vise à étudier la distribution tissulaire des métaux traces et des métallothionéines (MTs) chez la daurade «Sparus aurata » traitée par un métal essentiel (le cuivre) et un métal non essentiel (le cadmium) à une concentration de 500µg /Kg de poids frais pendant 48 heures....
Tipo: Journal Contribution
Palavras-chave: Animal organs; Bioaccumulation; Cadmium; Gills; Heavy metals; Metals; Pollutants; Pollution effects; Sediment pollution; Toxicity tests; Trace metals; Marine sciences; Biomarkers of exposure (organisms); Metallic elements.
Ano: 2009
URL: http://hdl.handle.net/1834/4448

Elemental concentrations and heavy metal pollution in sediments and suspended matter from the Belgian North Sea and the Scheldt estuary
Provedor de dados: 27
Autores: Van Alsenoy, V.; Bernard, P.; Van Grieken, R.
The elemental composition of sediment and suspended matter samples from the Belgian coastal and offshore regions of the Southern Bight of the North Sea and from the Scheldt estuary has been determined using X-ray fluorescence and atomic absorption spectrometry.Special attention was given to the heavy metals of the black and grey lists. The bulk sediment and the clay/silt fraction were analyzed. The average heavy metal contents in the fraction &lt;63 µm were comparable to the levels in the suspended matter. Different normalization techniques led to the identification of two different populations of sediments. Most of the sediments were enriched in Cd, Cr, Hg, Pb and Zn but no enrichment was found for Cu and Ni. Comparing these data with older data indicates...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Pollution; Sediments; Suspended particulate matter.
Ano: 1993
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2789

Determination of methanesulfonic acid and non-sea-salt sulfate in single marine aerosol particles
Provedor de dados: 27
Autores: Kolaitis, L.N.; Bruynseels, F.; Van Grieken, R.; Andreae, M.O.
In open ocean waters the predominant volatile sulfur compound is dimethyl sulfide (DMS), representing almost 90% of the marine sulfur emissions. Methanesulfonic acid (MSA), one of the oxidation products of DMS, is consequently an important constituent of marine aerosols. Laser microprobe mass analysis (LAMMA) has been used for single-particle analysis of particles collected in the marine boundary layer. MSA, like the non-sea-salt sulfate, is mainly associated with the smallest aerosol particles, whose LAMMA spectra match the reference fingerprint spectra of MSA salts, sodium methanesulfonate and ammonium methanesulfonate. The presence of nitrate and heavy metal ions in the LAMMA spectra can reveal, to a certain extent, the degree of air pollution at the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aerosols; Air pollution; Boundary layers; Heavy metals; Marine environment; Nitrates; Particle size; Sulphates.
Ano: 1989
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3177

Eucalyptus essential oil action on mycorrhizal colonization and the establishment of Eucalyptus grandis in soil contaminated by copper
Provedor de dados: 190
Autores: Steffen, Ricardo Bemfica; Antoniolli, Zaida Inês; Steffen, Gerusa Pauli Kist; Jacques, Rodrigo Josemar Seminoti; da Silva, Rodrigo Ferreira.
The use of eucalyptus essential oil can optimize the growth of ectomycorrhizal isolates, which aid the establishment of forest species in soils contaminated by copper. The study aimed to determine the best application of eucalyptus essential oil in the formation of mycorrhizal seedlings of Eucalyptus grandis and its influence on the establishment of these seedlings in soil contaminated by copper. It was used the ectomycorrhizal fungi (fECM) Pisolithus microcarpus. The application forms of the essential oil were evaluated in a greenhouse, by means of six treatments. Subsequently, the seedlings were transplanted and evaluated in soil contaminated by copper, greenhouse and field. It was determined height, diameter, fresh and dry weight of shoots and roots,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Secondary metabolites; Ectomycorrhizal Metais pesados; Metabólitos secundários; Fungos ectomicorrízicos.
Ano: 2011
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/268

Organic acids in the rhizosphere and phytoavailability of sewage sludge-borne trace elements
Provedor de dados: 86
Autores: Pires,Adriana Marlene Moreno; Marchi,Giuliano; Mattiazzo,Maria Emília; Guilherme,Luiz Roberto Guimarães.
The aim of this work was to quantify low molecular weight organic acids in the rhizosphere of plants grown in a sewage sludge-treated media, and to assess the correlation between the release of the acids and the concentrations of trace-elements in the shoots of the plants. The species utilized in the experiment were cultivated in sand and sewage sludge-treated sand. The acetic, citric, lactic, and oxalic acids, were identified and quantified by high performance liquid chromatography in samples collected from a hydroponics system. Averages obtained from each treatment, concentration of trace elements in shoots and concentration of organic acids in the rhizosphere, were compared by Tukey test, at 5% of probability. Linear correlation analysis was applied to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biosolid; Exudates; Heavy metals; Availability.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2007000700002

Biodiversity of Collembola in urban soils and their use as bioindicators for pollution
Provedor de dados: 86
Autores: Fiera,Cristina.
The objective of this work was to evaluate the effects of pollutants on the abundance and diversity of Collembola in urban soils. The research was carried out in three parks (Cişmigiu, Izvor and Unirea) in downtown Bucharest, where the intense car traffic accounts for 70% of the local air pollution. One site in particular (Cişmigiu park) was highly contaminated with Pb, Cd, Zn and Cu at about ten times the background levels of Pb. Collembola were sampled in 2006 (July, September, November) using the transect method: 2,475 individuals from 34 species of Collembola were collected from 210 samples of soil and litter. Numerical densities differed significantly between the studied sites.The influence of air pollutants on the springtail fauna was visible at the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Soil contamination; Species diversity; Urban parks.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2009000800010

Effects of nitrogen fertilization on heavy metal content of corn grains
Provedor de dados: 85
Autores: Rui,Yu-kui; Zhang,Fu-suo; Shen,Jian-bo.
Nitrogen fertilization has played a significant role in increasing crop yield, and solving problems of hunger and malnutrition worldwide. However, excessive nitrogen inputs do not significantly increase crop yields but may lead to many serious environmental problems. The effects of nitrogen fertilization rate were studied on heavy metal content of corn grains. Our results show that nitrogen fertilization management is beneficial for reducing production costs, protecting the environment, and improving the quality of farm products.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Nitrogen fertilization; Corn grain; Food safety; ICP-MS.
Ano: 2009
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572009000200003

The effects of tin (Sn) additions on the growth of spinach plants
Provedor de dados: 85
Autores: Müller,FL; Cyster,LF; Raitt,LM; Aalbers,J.
An increase in bioavailable tin in the environment could result in bioaccumulation thereof in agricultural crops, and therefore, have adverse health consequences on humans that eat these crops. The aims of the current study were thus to assess the uptake of Sn by spinach plants, and the subsequent efects this will have on the uptake of Na, Zn, K, Ca, and Mg as well as the growth of spinach plants. Spinach plants were grown in sand culture and received tin at concentrations of 0.02, 0.2, 2 and 20 mg/L along with a nutrient solution. The uptake of tin at detectible concentrations only occurred at the highest concentrations (2 and 20 mg/L), and it was mostly retained in the roots of the plants. Tin additions also resulted in no visual toxicity symptoms, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beneficial; Heavy metals; Root allocation; Stannous chloride.
Ano: 2015
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572015000200027

Heavy metal accumulation in Pelargonium hortorum: Effects on growth and development
Provedor de dados: 85
Autores: Orroño,DI; Lavado,RS.
Ornamental plants have been proposed for growing in heavy metal (HM) contaminated soils, and also for phytoremediation. We evaluated (1) biomass production and (2) HM accumulation in Pelargonium hortorum. Plants were grown for 16 weeks on HM (cadmium, chromium, copper, lead, nickel and zinc) enriched soils. Treatments were i) control, non-enriched soil, ii) medium concentration treatment, and iii) high concentration treatment. Four destructive harvests were carried out, and roots, stems, leaves, and flowers were analyzed each time. Concentrations of HM were determined using ICP. Significant reductions in biomass production were observed in HM-enriched soils compared with the control. Different indexes confirmed that P. hortorum was affected by HM. Heavy...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Ornamental plants; Tolerance index; Enriched soils; Plant heavy metal accumulation.
Ano: 2009
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572009000100013

Effectiveness of plant growth promoting rhizobacteria in facilitating lead and nutrient uptake by little seed canary grass
Provedor de dados: 88
Autores: Zaefarian,Faezeh; Vahidzadeh,Samaneh; Rahdari,Parvaneh; Rezvani,Mohammad; Zadeh,Hossein Ghani.
We investigated the effectiveness of Nitroxin inoculation on lead (Pb) and nutrient uptakes by little seed canary grass. The factors tested included inoculation (or not) with Nitroxin and different soil concentrations of Pb (0, 200, 400 and 800mgPbkg-1 soil). Increasing soil concentrations of Pb decreased stem, leaf and root dry weights. Shoot phosphorus concentrations increased in parallel with increasing soil Pb concentrations. Nitroxin inoculation did not alter the phosphorus concentration of the roots. The Pb translocation factor was &amp;gt;1 in inoculated treatments in the Pb soil concentration range of 200 to 400mgkg-1; the translocation factor for 800mgPbkg‑1 with no inoculation of Nitroxin was, however, &lt;1. Our results indicated that the Pb...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bioaccumulation factor; Heavy metals; Phalaris minor; Translocation factor.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042012000300003

Megaspore germination and initial development of Regnellidium diphyllum Lindman (Pteridophyta, Marsileaceae) sporophytes in the presence of cadmium
Provedor de dados: 88
Autores: Wunder,Denise A.; Droste,Annette; Windish,Paulo G.
Regnellidium diphyllum has its distribution restricted to Southern Brazil and adjoining localities in Uruguay and Argentina. Currently it is on the list of threatened species of Rio Grande do Sul. The conversion of wetlands into agricultural areas or soil contamination by the introduction of waste products and fertilizers may compromise the establishment and survival of this species. Among the pollutants are heavy metals, such as cadmium (Cd). Megaspores were germinated in liquid culture medium, with concentrations 0 (control), 0.39; 0.78; 1.56; 3.12; 6.25; 12.5; 25; 50 and 100 mg L-1 of Cd, starting from a standard solution of Titrisol® at 1000 mg L-1. The increase of Cd in the growth medium to 50 mg L-1 resulted in low germinability (58%), and no...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Ecophysiology; Heavy metals; Pollution; Pteridophytes; Reproduction.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042009000100017

Potencial de infectividade de fungos micorrízicos arbusculares oriundos de área de caatinga nativa e degradada por mineração, no Estado da Bahia, Brasil
Provedor de dados: 88
Autores: SILVA,GLADSTONE ALVES DA; MAIA,LEONOR COSTA; SILVA,FÁBIO SÉRGIO BARBOSA DA; LIMA,PAULO CÉSAR FERNANDES.
Os objetivos deste trabalho foram quantificar o número de esporos e o número mais provável de propágulos infectivos de FMA em solos da mineradora Caraíba, verificando influências sazonais na dinâmica desses propágulos e determinando os efeitos da mineração sobre o potencial de infectividade micorrízica. Foram realizadas coletas de solo na estação seca (agosto/98) e na chuvosa (fevereiro/99), em seis sub áreas da mineradora de cobre: 1 - local onde é depositado o rejeito; 2 - arredores da área industrial; 3 - local onde são depositados restos de rocha com pouco minério; 4 - caatinga nativa, não impactada; 5 - interface entre a caatinga e o rejeito; 6 - local onde foi retirada a camada superficial do solo. Foram identificadas 32 espécies de plantas num raio...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Arbuscular mycorrhiza; Heavy metals; Glomales; Mining; Disturbed area.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042001000200002

Plant availability of trace elements in sewage sludge-treated soils: methodology¹
Provedor de dados: 90
Autores: Marchi,Giuliano; Guilherme,Luiz Roberto Guimarães; Chang,Andrew C.
Synthetic root exudates were formulated based on the organic acid composition of root exudates derived from the rhizosphere of aseptically grown corn plants, pH of the rhizosphere, and the background chemical matrices of the soil solutions. The synthetic root exudates, which mimic the chemical conditions of the rhizosphere environment where soil-borne metals are dissolved and absorbed by plants, were used to extract metals from sewage-sludge treated soils 16 successive times. The concentrations of Zn, Cd, Ni, Cr, and Cu of the sludge-treated soil were 71.74, 0.21, 15.90, 58.12, and 37.44 mg kg-1, respectively. The composition of synthetic root exudates consisted of acetic, butyric, glutaric, lactic, maleic, propionic, pyruvic, succinic, tartaric, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Soil extractant; Organic acids; Rhizosphere; Root exudates.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000400039

CHROMIUM IN SOIL ORGANIC MATTER AND COWPEA AFTER FOUR CONSECUTIVE ANNUAL APPLICATIONS OF COMPOSTED TANNERY SLUDGE
Provedor de dados: 90
Autores: Oliveira,Mara Lucia Jacinto; Araujo,Ademir Sérgio Ferreira de; Melo,Wanderley José de.
Tannery sludge contains high concentrations of inorganic elements, such as chromium (Cr), which may lead to environmental pollution and affect human health The behavior of Cr in organic matter fractions and in the growth of cowpea (Vigna unguiculata L.) was studied in a sandy soil after four consecutive annual applications of composted tannery sludge (CTS). Over a four-year period, CTS was applied on permanent plots (2 × 5 m) and incorporated in the soil (0-20 cm) at the rates of 0, 2.5, 5.0, 10.0, and 20.0 Mg ha-1 (dry weight basis). These treatments were replicated four times in a randomized block design. In the fourth year, cowpea was planted and grown for 50 days, at which time we analyzed the Cr concentrations in the soil, in the fulvic acid, humic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil contamination; Humic substances; Solid residue; Heavy metals; Plant growth; Trace elements.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000100297

Cadmium availability and accumulation by lettuce and rice
Provedor de dados: 90
Autores: Pereira,Bruno Fernando Faria; Rozane,Danilo Eduardo; Araújo,Suzana Romeiro; Barth,Gabriel; Queiroz,Rafaela Josemara Barbosa; Nogueira,Thiago Assis Rodrigues; Moraes,Milton Ferreira; Cabral,Cleusa Pereira; Boaretto,Antonio Enedi; Malavolta,Eurípedes.
Among the toxic elements, Cd has received considerable attention in view of its association with a number of human health problems. The objectives of this study were to evaluate the Cd availability and accumulation in soil, transfer rate and toxicity in lettuce and rice plants grown in a Cd-contaminated Typic Hapludox. Two simultaneous greenhouse experiments with lettuce and rice test plants were conducted in a randomized complete block design with four replications. The treatments consisted of four Cd rates (CdCl2), 0.0; 1.3; 3.0 and 6.0 mg kg-1, based on the guidelines recommended by the Environmental Agency of the State of São Paulo, Brazil (Cetesb). Higher Cd rates increased extractable Cd (using Mehlich-3, Mehlich-1 and DTPA chemical extractants) and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lactuca sativa L.; Oryza sativa L.; Soil pollution; Chemical extractants; Heavy metals; Human health.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000200033

EFFECTS OF SILICON ON ALLEVIATING ARSENIC TOXICITY IN MAIZE PLANTS
Provedor de dados: 90
Autores: Silva,Airon José da; Nascimento,Clístenes Williams; Gouveia Neto,Artur da Silva; Silva Junior,Elias Arcanjo.
Arsenic is a metalloid highly toxic to plants and animals, causing reduced plant growth and various health problems for humans and animals. Silicon, however, has excelled in alleviating stress caused by toxic elements in plants. The aim of this study was to investigate the effects of Si in alleviating As stress in maize plants grown in a nutrient solution and evaluate the potential of the spectral emission parameters and the red fluorescence (Fr) and far-red fluorescence (FFr) ratio obtained in analysis of chlorophyll fluorescence in determination of this interaction. An experiment was carried out in a nutrient solution containing a toxic rate of As (68 μmol L-1) and six increasing rates of Si (0, 0.25, 0.5, 1.0, 1.5, and 2.0 mmol L-1). Dry matter...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Metalloids; Photosynthetic pigments; Trace element.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000100289

Reference Values of Soil Quality for the Rio Doce Basin
Provedor de dados: 90
Autores: Guevara,Yang Zumbo Coronel; Souza,José João Lelis Leal de; Veloso,Gustavo Vieira; Veloso,Renato Welmer; Rocha,Pablo Azevedo; Abrahão,Walter Antônio Pereira; Fernandes Filho,Elpídio Inácio.
ABSTRACT: The great geological and soil variation in the state of Minas Gerais, Brazil, indicates the need for regional studies to understand the geochemical background of soils. The Rio Doce Basin became a priority area for geochemical background determination after the rupture of the tailings dam of Fundão in 2015. In this context, the objectives of this study were to propose Reference Values of Soil Quality in the Rio Doce Basin, to define variables that can predict metal(loid) concentrations in the soil, and to examine the correlation between metal(loid) concentrations determined by X-ray fluorescence and by the traditional method. One hundred and seven samples were collected from minimally disturbed areas, representing the main soils and source...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: RDC; Iron Quadrangle; Heavy metals; Soil quality reference values; Mariana.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100515

Copper, zinc and manganese in soils of two watersheds in Santa Catarina with intensive use of pig slurry
Provedor de dados: 90
Autores: Mattias,Jorge Luis; Ceretta,Carlos Alberto; Nesi,Cristiano Nunes; Girotto,Eduardo; Trentin,Eder Efrain; Lourenzi,Cledimar Rogério; Vieira,Renan Costa Beber.
Systematic pig slurry application to crop soils may lead to the accumulation of heavy metals in regions with intensive pig raising. The aim of this study was to evaluate the accumulation of Cu, Zn and Mn in soils under systematic pig slurry application. For this purpose, soil samples were collected from two of the most representative watersheds of Santa Catarina where the predominant activity is pig raising. In each watershed, 12 properties were chosen to evaluate the different systems of pig husbandry (complete cycle (CC), farrowing (FaU) and finishing units (FiU)). Based on information of the producers, soil samples were collected in areas with and without systematic manure application. To determine the total Cu, Zn and Mn content in soils and manure, a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Animal manure; Environmental contamination.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000400040

Influence of digestion methods on the recovery of Iron, Zinc, Nickel, Chromium, Cadmium and Lead contents in 11 organic residues
Provedor de dados: 90
Autores: Abbruzzini,Thalita Fernanda; Silva,Carlos Alberto; Andrade,Daniela Aparecida de; Carneiro,Waldete Japiassú de Oliveira.
There are currently many devices and techniques to quantify trace elements (TEs) in various matrices, but their efficacy is dependent on the digestion methods (DMs) employed in the opening of such matrices which, although "organic", present inorganic components which are difficult to solubilize. This study was carried out to evaluate the recovery of Fe, Zn, Cr, Ni, Cd and Pb contents in samples of composts and cattle, horse, chicken, quail, and swine manures, as well as in sewage sludges and peat. The DMs employed were acid digestion in microwaves with HNO3 (EPA 3051A); nitric-perchloric digestion with HNO3 + HClO4 in a digestion block (NP); dry ashing in a muffle furnace and solubilization of residual ash in nitric acid (MDA); digestion by using aqua...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aqua regia; Heavy metals; Manure; Sewage sludge; Compost; Degree of humification.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000100016

Genesis, Characterization, and Classification of Mangrove Soils in the Subaé River Basin, Bahia, Brazil
Provedor de dados: 90
Autores: Bomfim,Marcela Rebouças; Santos,Jorge Antonio Gonzaga; Costa,Oldair Vinhas; Otero,Xosé Luis; Boas,Geraldo da Silva Vilas; Capelão,Valdinei da Silva; Santos,Edson de Souza dos; Nacif,Paulo Gabriel Soledade.
ABSTRACT Preservation of mangroves, a very significant ecosystem from a social, economic, and environmental viewpoint, requires knowledge on soil composition, genesis, morphology, and classification. These aspects are of paramount importance to understand the dynamics of sustainability and preservation of this natural resource. In this study mangrove soils in the Subaé river basin were described and classified and inorganic waste concentrations evaluated. Seven pedons of mangrove soil were chosen, five under fluvial influence and two under marine influence and analyzed for morphology. Samples of horizons and layers were collected for physical and chemical analyses, including heavy metals (Pb, Cd, Mn, Zn, and Fe). The moist soils were suboxidic, with Eh...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pedogenesis; Hydromorphism; Heavy metals.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000501247

Natural Fertility and Metals Contents in Soils of Rio Grande do Sul (Brazil)
Provedor de dados: 90
Autores: Althaus,Daiana; Gianello,Clesio; Tedesco,Marino José; Silva,Kelly Justin da; Bissani,Carlos Alberto; Felisberto,Regina.
ABSTRACT: The parent geological materials and formation factors influence the chemical, physical, and mineralogical properties and composition of the soil. Therefore, the aims of this study were to determine the chemical and some physical and mineralogical properties of the soil useful for agricultural practice; to determine the natural contents of the semitotal metals in soils of the state of Rio Grande do Sul (Brazil); and to suggest use of the quality reference values (QRVs) in accordance with Resolution 420/2009 of the National Commission for the Environment (Conama). To determine some soil properties useful for agricultural, 254 surface soil samples from areas without known human influence (native grasslands or forests) were analyzed according to the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Native soils; Chemical properties; Heavy metals; Quality reference values.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100502

Assessment of Trace Element Contents in Soils and Water from Cerrado Wetlands, Triângulo Mineiro Region
Provedor de dados: 90
Autores: Ribeiro,Bruno Teixeira; Nascimento,Diogo Costa; Curi,Nilton; Guilherme,Luiz Roberto Guimarães; Costa,Enio Tarso de Souza; Lopes,Guilherme; Carneiro,João Paulo.
ABSTRACT In the Brazilian Cerrado biome, there are wetlands locally known as “Veredas”, which are swampy plains between hills and rivers. Since the 1970’s, the Cerrado biome has been gradually converted to livestock, crop, or forestry production. Until now, very few studies were conducted to evaluate the baseline contents of trace elements in Cerrado wetland soils. Due to their position in the landscape (bottom lands), the wetlands are potentially susceptible to contamination by runoff and/or leaching from surrounding areas at higher altitudes. This work evaluated the As, Cd, Pb, Ni, Zn, Cu, Mn, and Fe contents in soils from six wetlands (undisturbed and disturbed) in the Minas Gerais Triangle region, Brazil. In each wetland, we collected topsoil samples...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Waterlogged soils; Soil contamination; Tropical soils; Heavy metals.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832019000100515

Tolerance to and Accumulation of Cadmium, Copper, and Zinc by Cupriavidus necator
Provedor de dados: 90
Autores: Vicentin,Rayssa Pereira; Santos,Jessé Valentim dos; Labory,Cláudia Regina Gontijo; Costa,Amanda Monique da; Moreira,Fatima Maria de Souza; Alves,Eduardo.
ABSTRACT Preliminary results of in vitro experiments with multicontaminated soils and solid media indicated that nodulating diazotrophic bacteria of the genus Cupriavidus are promising for the remediation of contaminated environments due to their symbiosis with legumes and metal tolerance. Thus, strains of Cupriavidus spp. (LMG 19424T, UFLA 01-659, UFLA 01-663, and UFLA 02-71) were tested for their ability to tolerate and bioaccumulate cadmium (Cd), copper (Cu), and zinc (Zn) in Luria-Bertani broth. Changes in the growth pattern of Cupriavidus strains in the presence or absence of heavy metals were analyzed by scanning electron microscopy and metal allocation by transmission electron microscopy, to clarify the mechanisms of bioremediation. Highest...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Electron microscopy; Diazotrophic bacteria; Bioremediation; Tolerance mechanisms.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100407

Arsenic toxicity in Acacia mangium willd. and mimosa Caesalpiniaefolia benth. seedlings
Provedor de dados: 90
Autores: Cipriani,Henrique Nery; Dias,Luiz Eduardo; Costa,Maurício Dutra; Campos,Naiara Viana; Azevedo,Aristéa Alves; Gomes,Roberto Junio; Fialho,Izabela Ferreira; Amezquita,Sandra Patrícia Montealegre.
Acacia mangium and Mimosa caesalpiniaefolia are fast-growing woody fabaceous species that might be suitable for phytoremediation of arsenic (As)-contaminated sites. To date, few studies on their tolerance to As toxicity have been published. Therefore, this study assessed As toxicity symptoms in A. mangium and M. caesalpiniaefolia seedlings under As stress in a greenhouse. Seedlings of Acacia mangium and M. caesalpiniaefolia were grown for 120 d in an Oxisol-sand mixture with 0, 50, 100, 200, and 400 mg kg-1 As, in four replications in four randomized blocks. The plants were assessed for visible toxicity symptoms, dry matter production, shoot/root ratio, root anatomy and As uptake. Analyses of variance and regression showed that the growth of A. mangium and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Arsenate; Heavy metals; Phytoremediation; Root anatomy; Soil contamination.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000500031

Protective effect of divalent cations against aluminum toxicity in soybean
Provedor de dados: 90
Autores: Silva,Ivo Ribeiro da; Corrêa,Tarcísio Fernando Côrtes; Novais,Roberto Ferreira; Gebrim,Fabrício de Oliveira; Nunes,Flancer Novais; Silva,Eulene Francisco da; Smyth,Thomas Jot.
A large proportion of soybean fields in Brazil are currently cultivated in the Cerrado region, where the area planted with this crop is growing considerably every year. Soybean cultivation in acid soils is also increasing worldwide. Since the levels of toxic aluminum (Al) in these acid soils is usually high it is important to understand how cations can reduce Al rhizotoxicity in soybean. In the present study we evaluated the ameliorative effect of nine divalent cations (Ca, Mg, Mn, Sr, Sn, Cu, Zn, Co and Ba) in solution culture on Al rhizotoxicity in soybean. The growth benefit of Ca and Mg to plants in an acid Inceptisol was also evaluated. In this experiment soil exchangeable Ca:Mg ratios were adjusted to reach 10 and 60 % base saturation, controlled by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Cation amelioration; Soil acidity; Ca:Mg ratio.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832008000500027

Geochemical Signature of Amazon Tropical Rainforest Soils
Provedor de dados: 90
Autores: Souza,José João Lelis Leal de; Fontes,Maurício Paulo Ferreira; Gilkes,Robert; Costa,Liovando Marciano da; Oliveira,Teogenes Senna de.
ABSTRACT: Evaluating soil geochemical diversity in the Amazon Basin has been a challenge largely because most study sites have been at the edge of the basin and it is difficult to get samples in such a region. Here we show that even among the most weathered soils, physicochemical soil properties express lithology. Our results are based on topsoil samples collected from different locations in minimally disturbed areas in the state of Amazonas, Brazil. Soil properties were measured using methods which are suitable for highly developed soils. The Chemical Index Alteration and Weathering Index of Parker was calculated based on the content of metal(loid)s in soils determined by X-ray fluorescence. Descriptive statistics, Pearson correlation, and Principal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Principal component analysis; XRF; Rainforest soils.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100403

Trace elements in Ultisol irrigated with landfill leachate and public-supply water
Provedor de dados: 91
Autores: Coelho,Daniela da C. L.; Batista,Rafael O.; Mesquita,Francisco O.; Silva,Ketson B. da; Alves,Sandra M. C.; Gurgel,Marcelo T.
ABSTRACT Landfill leachates have considerable amounts of organic matter and mineral nutrients and, when applied in environmentally adequate amounts, show fertilizing potential for the soil-plant system. This study aimed to analyze the effect of landfill leachate (LFL) and the public-supply water (PSW) depths on the contents of trace elements in an Ultisol. This work was carried out from April 21 to August 21, 2012, in split-split-plot scheme; LFL and PSW depths (T1 - 0 mm of LFL and 1067 mm of PSW; T2 – 60 mm of LFL and 1067 mm of PSW, T3 - 120 mm of LFL and 1067 of PSW, T4 - 180 mm of LFL and 1067 of PSW, and T5 - 240 mm of LFL and 1067 mm of PSW) in the plots, the analyzed layers (0-0.2 m and 0.2-0.4 m) in the subplots and the sampling times (0, 30, 60,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Liquid waste; Agricultural use; Heavy metals.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000800769

Organic compounds with high Ni content: Effects on soil and strawberry production
Provedor de dados: 91
Autores: Roveda,Luís F.; Cuquel,Francine L.; Motta,Antônio C. V.; Melo,Vander de F.
ABSTRACT The use of organic residues can improve soil chemical and physical conditions and plant growth. However, these residues often contain heavy metals that can interfere with growth. Here, a pot experiment was performed to compare the effects of organic compound (OC) containing a high nickel (Ni) load with those of a mineral Ni source (NiCl2, a soluble salt) on the production, quality and nutritional status of strawberry and on soil chemistry. Six dosages of Ni (0, 9, 18, 36, 72 and 144 mg kg-1) were added to the soil using both OC and NiCl2. The use of high-Ni OC resulted in increased productivity and fruit weight, whereas the soluble NiCl2 salt caused reduction in fruit weight. Application of NiCl2 at concentrations &gt;18 mg kg-1 also caused...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Phytotoxicity; Biosolids; Residues.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000800722

Barium and sodium in sunflower plants cultivated in soil treated with wastes of drilling of oil well
Provedor de dados: 91
Autores: Sampaio Junior,Jésus; Amaral,Nelson M. B. do; Zonta,Everaldo; Magalhães,Marcio O. L.
ABSTRACTThis study aimed to evaluate the effects of the application of two types of oil drilling wastes on the development and absorption of barium (Ba) and sodium (Na) by sunflower plants. The waste materials were generated during the drilling of the 7-MGP-98D-BA oil well, located in the state of Bahia, Brazil. The treatments consisted of: Control – without Ba application, comprising only its natural levels in the soil; Corrected control – with fertilization and without wastes; and the Ba doses of 300, 3000 and 6000 mg kg-1, which were equivalent to the applications of 16.6, 165.9 and 331.8 Mg ha-1 of waste from the dryer, and 2.6, 25.7 and 51.3 Mg ha-1 of waste from the centrifugal. Plants cultivated using the first dose of dryer waste and the second...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Helliantus annus; Salinization.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662015001101100

IS Annona emarginata CAPABLE OF ACCUMULATE ESSENTIAL HEAVY METALS WITHOUT DAMAGES IN THE METABOLISM?
Provedor de dados: 94
Autores: BARON,DANIEL; AMARO,AMANDA CRISTINA ESTEVES; MACEDO,ANA CLAUDIA; BOARO,CARMEN SÍLVIA FERNANDES; FERREIRA,GISELA.
ABSTRACT  This study aimed to evaluate if ionic strength variation causes differential accumulation of heavy metals in plants of Annona emarginata (Schltdl.) H. Rainer var. ‘terra-fria’, modifying gas exchange and dry matter production. The seedlings were cultivated under different ionic strengths of the ‘Hoagland and Arnon’s’ nutrient solution (75% I, 50% I and 25% I). At 180 days after the application of the treatments, the effects of the essential heavy metals on the physiological parameters and foliar ionic concentration were assessed. The leaf gas exchanges and vegetative growth were affected by the variation in the essential heavy metals, with positive effects on the plants that were treated with 75%I. The seedlings that were grown under 75% I...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Ionic strength; Mineral nutrition; Photosynthesis.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452017000400202

Rehabilitation with forage grasses of an area degraded by urban solid waste deposits
Provedor de dados: 96
Autores: Miranda,Vanessa Soares; Ribeiro,Karina Guimarães; Silva,Alexandre Christófaro; Pereira,Rosana Cristina; Pereira,Odilon Gomes; Torrado,Pablo Vidal; Fernandes,José Sebastião Cunha; Oliveira,Maxwel Coura.
Dry matter yield and chemical composition of forage grasses harvested from an area degraded by urban solid waste deposits were evaluated. A split-plot scheme in a randomized block design with four replicates was used, with five grasses in the plots and three harvests in the subplots. The mineral content and extraction and heavy metal concentration were evaluated in the second cut, using a randomized block design with five grasses and four replicates. The grasses were Brachiaria decumbens cv. Basilisk, Brachiaria ruziziensis, Brachiaria brizantha cv. Marandu and cv. Xaraés, and Panicum maximum cv. Tanzânia, cut at 42 days of regrowth. The dry matter yield per cut reached 1,480 kg ha-1; the minimum crude protein content was 9.5% and the average neutral...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria spp.; Dry matter yield; Heavy metals; Mineral extraction; Tanzania grass.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000100003

The effect of physical and chemical parameters on the macroinfaunal community structure of San Vicente bay, Chile
Provedor de dados: 97
Autores: SIEMENS,ROCÍO A.; MUDGE,STEPHEN M.; CANCINO,JUAN M.
San Vicente bay is a heavily industrialised bay located in central Chile, which has a sand beach extending from an area of recreational use in the south to an area of industrial use and discharge in the north. A survey of the macrofauna in the intertidal zone revealed a non-homogeneous distribution; a maximum of five invertebrate species were found with all five only occurring in one of six transects down the beach. The density ranged from 0 to 188 individuals m-2, with the highest density at the recreational end. The most common species, Emerita analoga (Stimpson), was chosen to study the macrofaunal response to beach morphodynamics, physicochemical parameters and metal concentrations. The E. analoga distribution was not significantly correlated with the...
Tipo: Journal article
Palavras-chave: Intertidal macrofauna; Central Chile; Sandy beaches; Beach morphodynamics; Interstitial water; Heavy metals.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000200017

Preliminary observations of cadmium and copper effects on juveniles of the polychaete Capitella sp. Y (Annelida: Polychaeta) from Estero del Yugo, Mazatlán, México
Provedor de dados: 97
Autores: MÉNDEZ,NURIA; GREEN-RUIZ,CARLOS.
The effects of cadmium (Cd) and copper (Cu) on cultured juveniles of Capitella sp. Y were investigated. Seven-day old juveniles were exposed to 13 (control), 60, 160, 240 and 340 mg Cd L-1 and 17 (control), 50, 120 and 150 mg Cu L-1 for 30 days. Mortality significantly increased with increasing Cu concentrations, but in Cd exposures, it was only evident at 340 mg L-1. Body size and faecal pellet production were reduced earlier in juveniles exposed to Cu than those exposed to Cd, especially in the higher Cu concentrations. These facts indicate that juveniles are more sensitive to Cu in terms of mortality, feeding and growth. Haemoglobin production was inhibited due to the scarcity of food in the experimental sediment rather than to metal exposure. Tube...
Tipo: Journal article
Palavras-chave: Bioassays; Marine worms; Mortality; Juveniles; Heavy metals.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2005000400009

Cadmium and copper adsorption on bentonite: effects of pH and particle size
Provedor de dados: 124
Autores: Chaves,Lúcia Helena Garófalo; Tit,Gilvanise Alves.
Reactions of heavy metals with clay minerals are important in determining metal fates in the environment. However, the adsorption process of these metals by the bentonite has been extensively investigated. The objectives of this work were to assess the ability of bentonite clay to adsorb cadmium and copper and to study the effects of pH and particle size upon these metals adsorption. Adsorption isotherms were obtained from batch adsorption experiments, with increasing cadmium and copper concentrations (5-200 mg L-1). To find out the effects of pH and particle size on adsorption, the experiments were conducted at pH 4; 5 and 6 using particles sizes of &lt; 0.5 mm and 0.5 to 2.0 mm . The difference between initial and final cadmium and copper concentrations...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Clay mineral; Heavy metals; Isotherms; Langmuir.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902011000200004

Multivariate analyses to establish reference values for soils in Médio Paraíba, state of Rio de Janeiro, Brazil
Provedor de dados: 124
Autores: Mattos,Amanda Guimarães de; Lima,Erica Souto Abreu; Amaral Sobrinho,Nelson Moura Brasil do; Zoffoli,Hugo José de Oliveira; Pérez,Daniel Vidal.
ABSTRACT Quality Reference Values (QRVs) for potentially toxic elements are obtained from background levels in soils. However, this determination from mean values or percentiles is not appropriate given the variability in the natural distribution of these elements in soils. Therefore, the objective of this study was to propose a new methodology to establish the QRVs, using the Médio Paraíba region (RJ, Brazil) as an example, from groups of soils defined based on the pseudo-total levels of B, Ba, Co, Cr, Cu, Ni, Pb, and Zn through the use of multivariate analyses and discriminant functions. A total of 40 points, collected at depths of 0-20 and 20-40 cm, were used for the determination of pseudo-total contents, according to the EPA 3051A methodology. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Guiding values; Heavy metals; Cluster analysis.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902018000100001

Solute Interactions in Soils in Relation to Bioavailability and Remediation of the Environment
Provedor de dados: 127
Autores: Bolan,N.S; Ko,B.G; Anderson,C.W.N; Vogeler,I.
Tipo: Journal article
Palavras-chave: Phytoremediation; Heavy metals; Soil remediation.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912008000400002

Bioavailability of cadmium and lead in a soil amended with phosphorus fertilizers
Provedor de dados: 63
Autores: Mendes,Alessandra Monteiro Salviano; Duda,Gustavo Pereira; Nascimento,Clístenes Williams Araújo do; Silva,Michelangelo Oliveira.
Phosphorus fertilizers are essential to obtain high productivity, however, they contain heavy metals that can contaminate the soil and threat the health of animals and humans. The present study focused the determination of Cd and Pb concentrations in different phosphorus fertilizers as well as the absorption of these heavy metals by velvet green bean grown on soil amended with such fertilizers. The experiment was set up as a completely randomized design in a factorial scheme. The factors were four phosphorus sources (triple superphosphate-TS, Yorin thermophosphate-YT, Araxa rock phosphate-AP, and Gafsa rock phosphate-GP) applied at five rates (0, 92, 183, 275, and 366 kg ha-1 of P2O5). The data obtained were submitted to variance and regression analysis....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Phytoextraction.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000400003

Routine soil testing to monitor heavy metals and boron
Provedor de dados: 63
Autores: Abreu,Cleide Aparecida de; van Raij,Bernardo; Abreu,Mônica Ferreira de; González,Antonio Paz.
Microelements are an important issue in agriculture, due to their need as micronutrients for plants and also to the possibility of the build-up of toxic levels for plants and animals. Five micronutrients (B, Cu, Fe, Mn, and Zn) are routinely determined in soil analysis for advisory purposes. Other four elements (Cd, Cr, Pb, and Ni) are considered environmentally important heavy metals in farmland soils. Thus high contents of these metals in cropland might go eventually unnoticed. In this paper we present an approach that can be used to monitor the contents of the nine elements in farmland soils using advisory soil testing. A total of 13,416 soil samples from 21 Brazilian states, 58% of them from the state of São Paulo, sent by farmers were analyzed. Boron...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil analyses; Micronutrients; Heavy metals; Deficiency; Toxicity; Interpretation limits.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000600009

Copper, nickel and zinc phytoavailability in an oxisol amended with sewage sludge and liming
Provedor de dados: 63
Autores: Martins,Adão Luiz Castanheiro; Bataglia,Ondino Cleante; Camargo,Otávio Antonio de.
Contents of heavy metal on agricultural soils have been raised by land applications of sewage sludge and may constitute a hazard to plants, animals and humans. A field experiment was carried out from 1983 to 1987, to evaluate the long-term effect of sewage sludge application, with and without liming, on heavy metal accumulation and availability in a Rhodic Hapludox soil grown with maize (HMD 7974 hybrid). Trials were set up in a completely randomized blocks design with four replications. Each block was split in two bands, one with and another without liming. The sludge was applied in each band at rates: 0, 20, 40, 60 and 80 Mg ha-1 (dry basis) in a single application; and 40, 60 and 80 Mg ha-1 split in two, three and four equal yearly applications,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: DTPA; Mehlich-3; Heavy metals; Extractability; Corn.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400021

Background levels of some trace elements in weathered soils from the Brazilian Northern region
Provedor de dados: 63
Autores: Fadigas,Francisco Souza; Amaral Sobrinho,Nelson Moura Brasil do; Anjos,Lucia Helena Cunha dos; Mazur,Nelson.
Soils formed from the Barreiras Group sediments, located mainly along the coast of Brazil Northern and Northeastern regions, generally present low concentrations of iron oxides and total organic carbon, high quantities of quartz in the sand fraction, and kaolinitic clay mineralogy. The objective of the present study was to quantify the pseudo total concentrations of Cd, Co, Cu, Cr, Mn, Ni, Zn and Fe in Xhantic Udox and Xhantic Udult soils derived from these sediments. The reference sites were covered by native vegetation and located in the States of Pará and Amapá, Brazil. Multiple linear regression analysis was applied to determine correlations between soil parameters and the levels of these metals. The best correlation was obtained between Fe, Mn, clay,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Udox; Udult; Heavy metals; Metal soil estimation; Multiple linear regression.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000100008

Phytoextraction: a review on enhanced metal availability and plant accumulation
Provedor de dados: 63
Autores: Nascimento,Clístenes Williams Araújo do; Xing,Baoshan.
Phytoextraction has emerged as a novel approach to clean up metal-polluted soils in which plants are used to transfer toxic metals from soils to shoots. This review provides a synthesis of current knowledge on phytoextraction of metals from soils and their accumulation in plants. The objective is to integrate soil-related (root exudates and chemical amendments) and biological advances to suggest research needs and future directions. As far as can be deduced from the literature, it will be some time before phytoextraction may be established as a commercial technology. For chemically-assisted phytoextraction, research has not shown easily biodegradable compounds to overcome the risks associated with the use of EDTA for poorly available metals in soils. On...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: EDTA; Phytoremediation; Heavy metals; Organic acids.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000300014

Zinc availability for corn grown on an oxisol amended with flue dust
Provedor de dados: 63
Autores: Santos,Gláucia Cecília Gabrielli dos; Berton,Ronaldo Severiano; Camargo,Otávio Antônio de; Abreu,Mônica Ferreira de.
The costs related to the construction and maintenance of industrial landfills, and the environmental risks that they may represent, have increased the interest of several types of industries in studying the possibility of applying residues to agricultural soils. This study evaluates the efficiency of flue dust as a zinc source for corn, and the zinc availability for corn evaluated by four methods. A greenhouse experiment carried out at Campinas, SP, Brazil, evaluated the effect of two zinc sources (flue dust and zinc sulphate), at three rates (5, 50 and 150 mg dm-3), in one soil (Rhodic Hapludox) under two pH conditions (5.0 and 6.0). The treatments were arranged in a randomized factorial scheme design with three replications. Zinc availability indexes...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: DTPA; Heavy metals; Industrial wastes; Speciation; Soil pH.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000600008

Chemical amendment and phytostabilization of an industrial residue contaminated with Zn and Cd
Provedor de dados: 63
Autores: Santos,Fabiana Soares dos; Magalhães,Márcio Osvaldo Lima; Mazur,Nelson; Amaral Sobrinho,Nelson Moura Brasil do.
Phytostabilisation of a contaminated soil with heavy metals is considered a very appropriate technology to reduce erosion and dispersion of contaminants. A greenhouse study was conducted to evaluate the effects of both chemical amendments (calcium silicate and brewery sludge), and phytoremediation using the grass Brachiaria decumbens, on an industrial residue contaminated with Zn and Cd (industrial residue). Industrial residue samples placed into 30 L containers were amended with 20% brewery sludge, calcium silicate (2%, 3%), and 20% of brewery sludge + calcium silicate (2.5%, 4%), and were compared to the control treatment (non-amended residue). After pH stabilization, B. decumbens plants were grown on all treatments in order to evaluate the ability of...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Phytoremediation; Inertization; Contamination; Heavy metals.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000500008

Adsorption of Cd, Cu, Ni and Zn in tropical soils under competitive and non-competitive systems
Provedor de dados: 63
Autores: Moreira,Cindy Silva; Alleoni,Luís Reynaldo Ferracciú.
The adsorption of heavy metals in soils affects their behavior in the environment and their bioavailability to plants. The knowledge of the adsorption mechanisms in competitive systems allows a more realistic evaluation of the metals' behavior in the soil than the single metal adsorption. The objectives of this study were (i) to evaluate Cd, Cu, Ni, and Zn adsorption in 14 surface samples (0-0.2 m) of representative soils of the Brazilian humid-tropical region, in competitive and non-competitive systems, and (ii) to establish metal affinity sequences for each soil, based in the maximum adsorption capacity (MAC) estimated by the Langmuir model. The Rhodic Eutrudox, the Kandiudalf Eutrudox, the Arenic Hapludalf, the Arenic Hapludult and the Typic Argiudoll...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Competition; Tropical soil.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000300008

Determining the geographical origin of lettuce with data mining applied to micronutrients and soil properties
Provedor de dados: 63
Autores: Maione,Camila; Araujo,Eloá Moura; Santos-Araujo,Sabrina Novaes dos; Boim,Alexys Giorgia Friol; Barbosa,Rommel Melgaço; Alleoni,Luís Reynaldo Ferracciú.
ABSTRACT Lettuce (Lactuca sativa) is the main leafy vegetable produced in Brazil. Since its production is widespread all over the country, lettuce traceability and quality assurance is hampered. In this study, we propose a new method to identify the geographical origin of Brazilian lettuce. The method uses a powerful data mining technique called support vector machines (SVM) applied to elemental composition and soil properties of samples analyzed. We investigated lettuce produced in São Paulo and Pernambuco, two states in the southeastern and northeastern regions in Brazil, respectively. We investigated efficiency of the SVM model by comparing its results with those achieved by traditional linear discriminant analysis (LDA). The SVM models outperformed the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: ICP–OES; Traceability; Tropical soils; Heavy metals; Feature selection.
Ano: 2022
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162022000100901

Cadmium voltametric quantification in table chocolate produced in Chiquinquira-Boyaca, Colombia
Provedor de dados: 109
Autores: Chaparro-Acuña,Sandra Patricia; Vargas-Moreno,Paola Andrea; Silva-Gómez,Leonardo Andrés; Cárdenas,Oswaldo Eliécer.
Abstract: Bioaccumulation of heavy metals such as cadmium has been a major concern in scientific communities and international food organizations, given the great toxicological risk to the consumer, and in many places there is no detailed record of its actual content. In this way, the need arises to carry out a study and registration of the concentration of this metal in products such as table chocolate, of great consumption at regional and national level. Likewise, we seek to have effective quantification tools and a reliable and affordable method to achieve the aim of this research. In this research, Cadmium content in powdered and granulated table chocolate was determined, elaborated and commercialized in the municipality of Chiquinquira,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Food; Cocoa; Electrochemistry; Heavy metals; Validation.
Ano: 2017
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122017000200172

Soil bacteria that precipitate calcium carbonate: mechanism and applications of the process
Provedor de dados: 109
Autores: Chaparro-Acuña,Sandra Patricia; Becerra-Jiménez,Mónica Liliana; Martínez-Zambrano,José Jobanny; Rojas-Sarmiento,Hugo Alfonso.
Abstract Bacteria with ureasic activity are microorganisms found in soil that in presence of urea and calcium, they can produce calcium carbonate, a process known as microbiologically induced calcium carbonate precipitation (MICP). This article discusses this process and its mechanism, as well as bacterial urease, calcium carbonate crystals formed, and factors that affect the efficiency of MICP, as type of bacteria, bacterial cell concentrations, pH, temperature and calcium and urea concentrations. In addition, applications as removal of heavy metals in water, bioconsolidation, biocement and CO2 sequestration are also discussed.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biomineralization; Bacillus; Urease; Carbonates; Heavy metals; Bioconsolidation; Biocementation.
Ano: 2018
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122018000200277

Total mercury in wild felids occurring in protected areas in the central Brazilian Amazon
Provedor de dados: 36
Autores: LOPES,Marcelly Castello Branco; CARVALHO,Gabriel Oliveira de; BERNARDO,Robson Roney; MACEDO,Joana; LINO,Adan Santos; RAMALHO,Emiliano Esterci; KASPER,Daniele; MEIRE,Rodrigo Ornellas; TORRES,João Paulo Machado; MALM,Olaf.
ABSTRACT This is the first study to investigate mercury (Hg) contamination in felid species in the Brazilian Amazon. We collected 26 fur samples from wild felids of four species (Puma concolor, Panthera onca, Leopardus pardalis and Leopardus wiedii) occurring in the Mamirauá and Amanã sustainable development reserves, in the state of Amazonas. Samples were from museum specimens, except for five P. onca samples collected from free-living individuals. Total Hg concentrations ranged from 0.12 to 48.1 µg g-1. Concentrations of Hg did not differ significantly between museum specimens and live individuals of P. onca, but varied significantly among species, with significantly higher concentrations for P. onca and L. pardalis, which could be related to factors...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conservation; Mammals; Bioaccumulation; Fur; Heavy metals.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672020000200142

Mercury Levels in Eggs, Embryos, and Neonates of Trachemys callirostris (Testudines, Emydidae)
Provedor de dados: 37
Autores: RENDÓN-VALENCIA,BEATRIZ; ZAPATA,LINA M; C. BOCK,BRIAN; PÁEZ,VIVIAN P.; PALACIO,JAIME A.
We quantified total mercury concentrations in eggshells, egg yolks, and embryos from 16 nests of the Colombian Slider (Trachemys callirostris). Nests were collected in different stages of development, but estimated time of incubation in natural substrates was not correlated with mercury levels in the eggs, suggesting that mercury was not absorbed from the substrate, but more likely passed on to the embryos during folliculogenesis by the reproductive females who had bioaccumulated the mercury from environmental sources. Mean mercury concentrations were higher in embryos than in eggshells or egg yolks, indicating that embryos also bioaccumulate mercury present in other egg tissues. Intra-clutch variation in egg yolk mercury concentrations was relatively...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bioaccumulation; Colombian slider; Heavy metals; Mercury; Yolk.
Ano: 2014
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2014000300016

Germination and sporophytic development of Regnellidium diphyllum Lindm. (Marsileaceae) in the presence of copper
Provedor de dados: 39
Autores: Cassanego,Mara Betânia Brizola; Goldoni,Angélica; Heldt,Fágner Henrique; Osório,Daniela Montanari Migliavacca; Windisch,Paulo Günter; Droste,Annette.
Regnellidium diphyllum Lindm. is a heterosporous fern growing in wetlands and humid soils that are being converted to agricultural activities. Many products that are used in agriculture contain copper, resulting in surface and groundwater contamination. Germination and initial development tests were performed using Meyer's solution containing copper sulphate at concentrations of 0 (control), 1, 5, 10, 50 and 100 mg L-1. The experiment was conducted in a growth chamber at 25 ± 1ºC for 28 days, with a 12/12-hour light/dark cycle and a photon flux density of 100 µmol m-2 s-1. The lowest germination rate (6%) was observed at 100 mg L-1. Primary root growth was significantly reduced at &gt; 10 mg L-1. Secondary leaves of sporophytes grown in concentrations &gt;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fern; Heavy metals; Pollution; Reproduction; Species conservation; Wetlands.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000100004

Mosses as indicators of atmospheric metal deposition in an industrial area of southern Brazil
Provedor de dados: 39
Autores: Mazzoni,Aline Correa; Lanzer,Rosane; Bordin,Juçara; Schäfer,Alois; Wasum,Ronaldo.
Caxias do Sul hosts the second largest metal-mechanic pole in Brazil, which increases the risk of atmospheric contamination. With the aim of identifying species that might be useful as indicators of atmospheric deposition of metals, 15 species of mosses from an urban and a rural setting were analyzed and compared with specimens deposited at the Herbarium of the Universidade de Caxias do Sul. Metal concentrations (Zn, Ni, Cd, Cr, Cu and Pb) were determined using Atomic Absorption Spectrometry (AAS). The Mann-Whitney test indicated concentrations of Zn, Cu, Pb and Cr that were significantly different between the urban and rural areas. Additionally, Concentrations of Zn, Cd, Cu and Pb were significantly higher in recently collected samples. The species...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atmospheric pollution; Bioindicators; Bryophyta; Heavy metals; Rio Grande do Sul.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062012000300005

Concentrations of major and trace elements in the soils, edible parts of crops and urine of farmers in agroecological communities
Provedor de dados: 1
Autores: Silva, João Paulo Siqueira da; Nascimento, Clístenes Williams Araújo do; Nascimento, Alexsandra Xavier do; Silva, Yuri Jacques Bezerra da; Biondi, Caroline Miranda.
The relationship between soil and health is important for populations that depend on the local environment to meet their nutritional needs. This study aimed to evaluate the concentrations of major and trace elements in the soils, edible parts of crops and urine of farmers in agroecological communities. We collected samples of soil, edible parts of crops and urine of farmers and family members in 23 crop fields in agroecological communities from northeast Brazil. These samples were analyzed to concentrations of Al, As, Ca, Cr, Cu, Fe, Hg, Mg, Zn, and Pb in urine and discriminant analysis and principal component analysis were used to assess the data. Concentrations of potentially toxic elements in soils and crops of agroecosystems were below regulatory...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Agroecossystems; Biomonitoring.
Ano: 2019
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/42623

Concentrations of major and trace elements in the soils, edible parts of crops and urine of farmers in agroecological communities
Provedor de dados: 1
Autores: Silva, João Paulo Siqueira da; Nascimento, Clístenes Williams Araújo do; Nascimento, Alexsandra Xavier do; Silva, Yuri Jacques Bezerra da; Biondi, Caroline Miranda.
The relationship between soil and health is important for populations that depend on the local environment to meet their nutritional needs. This study aimed to evaluate the concentrations of major and trace elements in the soils, edible parts of crops and urine of farmers in agroecological communities. We collected samples of soil, edible parts of crops and urine of farmers and family members in 23 crop fields in agroecological communities from northeast Brazil. These samples were analyzed to concentrations of Al, As, Ca, Cr, Cu, Fe, Hg, Mg, Zn, and Pb in urine and discriminant analysis and principal component analysis were used to assess the data. Concentrations of potentially toxic elements in soils and crops of agroecosystems were below regulatory...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Agroecossystems; Biomonitoring.
Ano: 2019
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/42623

Unveiling neotropical serpentine flora: a list of Brazilian tree species in an iron saturated environment in Bom Sucesso, Minas Gerais
Provedor de dados: 3
Autores: Guimarães, Aretha Franklin; Querido, Luciano Carramaschi de Alagão; Coelho, Polyanne Aparecida; Santos, Paola Ferreira; Santos, Rubens Manoel dos.
Serpentine soils are those holding at least of 70% iron-magnesium compounds, which make life intolerable for many species. Although plant's adaptation to environmental toughness is widely studied in tropics, virtually nothing is known about Brazilian serpentine flora. Our aim was to bring up and characterize the serpentine flora in Bom Sucesso, Minas Gerais state, Brazil. We performed expeditions utilizing rapid survey sampling method to identify the arboreal compound in the area. Plants within circumference at breast high (CBH) up to 15,7 cm were included in our study. A specialist identified all the individuals to species level. We found 246 species located in 59 botanical families. Fabaceae, Myrtaceae and Melastomataceae were the most representative...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ultramafic vegetation; Trace elements; Heavy metals; Serpentine soil.
Ano: 2019
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/44594

Cd, Cu, and Mn from Uruguay River Basin in Uruguaiana, RS, Brazil, and their toxicological potential for human leukocyte
Provedor de dados: 3
Autores: Costa, Gislaine Rezer; Rocha, Mariana Balhego; Querol, Marcus Vinicius Morini; Dal Magro, Jacir; Machado, Michel Mansur; Oliveira, Luís Flávio Souza de.
This study assessed the limnology from the Medium Uruguay River Basin in Uruguaiana, Brazil, with a focus on the concentration of heavy metals (Cd, Cu, and Mn), to assess the toxicological potential (cytotoxicity and genotoxicity) for humans using as biological matrix of study human leukocyte cells. The conductivity, resistivity, and dissolved O2 levels exceeded the limits recommended by the National Environmental Council (Conselho Nacional do Meio Ambiente - CONAMA). The percentage of non-viable human leukocyte cells exposed to water samples was approximately 20% higher than that of the negative control (&lt;3%), but similar to the positive control. The DNA damage index was high for all heavy metal concentrations assayed when compared to the negative...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 2.00.00.00-6 ecotoxicology; Genotoxicity; Limnology; Heavy metals; Uruguay River Basin Ecotoxicologia.
Ano: 2016
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/31998

Ecotoxicological Effects of Three Heavy Metals on the Root Growth of Four Vascular Plants
Provedor de dados: 113
Autores: Iannacone O.,José; Alvariño F.,Lorena.
Environmental risk assessment (ERA) of terrestrial environments polluted by heavy metals in Peru requires standardized biological organisms, the use of which is simple, practical, sensitive and repeatable, such as seeds of higher plants used in eco-toxicological bioassays. The aim of this research was to evaluate the phytotoxic effects of Cr6+, Hg2+ and Pb2+ as potassium dichromate (K2Cr(2)0(7)), mercury chloride (Cl2Hg) and lead acetate ((CH3C00)2Pb), respectively, on growing roots of four species of higher terrestrial plants: onions (Allium cepa L., Liliaceae), red beets (Beta vulgaris L., Chenopodiaceae), rice (Oriza sativa L., Poaceae) and radishes (Raphanus sativus L., Brassicaceae) at 192 h (8 days) exposure. Bioassays of static sub-lethal toxicity...
Tipo: Journal article
Palavras-chave: Heavy metals; Peru; Seeds; Vascular plants; Seeds; Mining waste; Chromium; Mercury; Lead.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072005000200009

Eco-genetic study on water hyacinth, Eichhornia crassipes (Mart.) Solms, the world's most invasive aquatic plant
Provedor de dados: 111
Autores: El-Shahawy, Tarek Abd El-Ghafar.
Water hyacinth is a complicated, multifaceted problem disturbs all interested and concerned entities in aquatic weed management. Water hyacinth, which is the world's most aggressive and destructive aquatic freshwater species, extends over vast areas of the world creating serious ecological and cultural problems. So far, water quality does not represent a dilemma against water hyacinth growth. The objective of the current work is to study the potential genetic differences between water hyacinth populations growing under different aquatic ecosystems in Egypt. Water and plant samples were collected from three different sites namely irrigation water, drainage water and sewage water at Al-Buhayrah Governorate, Damanhour District. The physicochemical properties...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Botany; Weed biology and control Aquatic weeds; Aquatic ecosystems; Genetic variation; Heavy metals; Invasive plants; Water quality.
Ano: 2018
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/4392

Lead tolerance of water hyacinth (Eichhornia crassipes Mart. - Pontederiaceae) as defined by anatomical and physiological traits
Provedor de dados: 42
Autores: PEREIRA,FABRICIO J.; CASTRO,EVARISTO M. DE; OLIVEIRA,CYNTHIA DE; PIRES,MARINÊS F.; PEREIRA,MARCIO P.; RAMOS,SILVIO J.; FAQUIN,VALDEMAR.
This study aimed at verifying the lead tolerance of water hyacinth and at looking at consequent anatomical and physiological modifications. Water hyacinth plants were grown on nutrient solutions with five different lead concentrations: 0.00, 0.50, 1.00, 2.00 and 4.00 mg L–1 by 20 days. Photosynthesis, transpiration, stomatal conductance and the Ci/Ca rate were measured at the end of 15 days of experiment. At the end of the experiment, the anatomical modifications in the roots and leaves, and the activity of antioxidant system enzymes, were evaluated. Photosynthetic and Ci/Ca rates were both increased under all lead treatments. Leaf anatomy did not exhibit any evidence of toxicity effects, but showed modifications of the stomata and in the thickness of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Ecophysiology; Plant anatomy; Macrophytes.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301423

The contribution of heavy metal pollution derived from highway runoff to Guanabara Bay sediments: Rio de Janeiro / Brazil
Provedor de dados: 42
Autores: Pereira,Edisio; Baptista-Neto,José A.; Smith,Bernard J.; Mcallister,John J.
In this study, geochemical and particle size analyses of thirty-four street sediment samples collected from an urban environment around Guanabara Bay, shows highway run-off to be a potential source of heavy metals for the pollution of near-shore sedimentary deposits. Concentrations of Fe, Mn, Zn, Cu, Pb, Cr and Ni were found to be higher in these sediments when compared to concentrations found in samples from the natural environment, where an Enrichment Factor (EF) index was used to distinguish between natural and anthropogenic sources. Particle size analysis shows these sediments to be predominantly composed of sand and no distribution pattern was observed between the sand, silt and clay fractions. High levels of organic matter and heavy metals would...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Urban runoff; Guanabara Bay.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000400013

Environmental risk increase due to heavy metal contamination caused by a copper mining activity in Southern Brazil
Provedor de dados: 42
Autores: BIDONE,EDISON D.; LAYBAUER,LUCIANO; CASTILHOS,ZULEICA C.; MADDOCK,JOHN L.
The Camaquã Copper Mines (CCM) were the main sulphide deposit in Southern Brazil and have been in operation from last century to 1996. To evaluate water contamination and environmental risk increase by heavy metals from mining operations, two points on the João Dias Creek were sampled (Station 1, background area and Station 2, contaminated area). Mining activity increased the natural weakly heavy metal fluxes by approximately 5424 kg. ( ~ 60%) of the total metal flux, 1542 kg. ( ~ 49%) of dissolved and 3881 kg ( ~ 66%) of particulate metal flux. Total metal flux of anthropic origin was mostly due to Fe followed by Cu &gt; Zn &gt; Mn whereas Cd, As and Pb fluxes were negligible. The potential human health hazards and risk assessment related to daily intake...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water contamination; Environmental risk; Heavy metals; Copper mining.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000200011

Elemental composition of vegetables cultivated over coal-mining waste
Provedor de dados: 42
Autores: ZOCCHE,JAIRO J.; ROHR,PAULA; DAMIANI,ADRIANI P.; LEFFA,DANIELA D.; MARTINS,MIRIAM C.; ZOCCHE,CAROLINE M.; TEIXEIRA,KARINA O.; BORGES,GABRIELA D.; JESUS,MAIELLEN M. DE; SANTOS,CARLA E.I. DOS; DIAS,JOHNNY F.; ANDRADE,VANESSA M. DE.
ABSTRACT We assessed elemental composition of the liver in mice subjected to one-time or chronic consumption of the juice of vegetables cultivated in a vegetable garden built over deposits of coal waste. Lactuca sativa L. (lettuce), Beta vulgaris L. (beet), Brassica oleracea L. var. italica (broccoli) and Brassica oleracea L. var. acephala (kale) were collected from the coal-mining area and from a certified organic farm (control). Elemental composition was analyzed by particle-induced X-ray emission (PIXE) method. Concentrations of Mg, S, and Ca of mice subjected to one-time consumption of broccoli and concentrations of these same elements plus Si of mice receiving kale were higher in the coal-mining area. Concentrations of P, K, and Cu were increase after...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coal; Anthropogenic soil; Trace elements; Heavy metals; Plants; PIXE.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502383

Heavy metal concentrations in soils from a remote oceanic island, Fernando de Noronha, Brazil
Provedor de dados: 42
Autores: Oliveira,Sonia M.B. de; Pessenda,Luiz C.R.; Gouveia,Suzy E.M.; Favaro,Deborah I.T.
This paper examines the role of parent rock, pedogenetic processes and airborne pollution in heavy metal accumulation in soils from a remote oceanic island, Fernando de Noronha, Brazil. We studied five soil profiles developed from different volcanic rocks. Mineralogical composition and total concentrations of major and trace elements were determined in 43 samples. The obtained concentrations range for heavy metals were: Co: 26-261 ppm; Cu: 35-97 ppm; Cr: 350-1446 ppm; Ni: 114-691 ppm; Zn: 101-374 ppm; Hg: 2-150 ppb. The composition of soils is strongly affected by the geochemical character of the parent rock. Pedogenesis appears to be responsible for the accumulation of Zn, Co, and, to a lesser extent, of Ni and Cu, in the upper, Mn- and organic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Soils; Anthropogenic mercury; Fernando de Noronha.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400007

Changes in the phenylalanine ammonia lyase activity, total phenolic compounds, and flavonoids in Prosopis glandulosa treated with cadmium and copper
Provedor de dados: 42
Autores: GONZÁLEZ-MENDOZA,DANIEL; TRONCOSO-ROJAS,ROSALBA; GONZALEZ-SOTO,TANIA; GRIMALDO-JUAREZ,ONECIMO; CECEÑA-DURAN,CARLOS; DURAN-HERNANDEZ,DAGOBERTO; GUTIERREZ-MICELI,FEDERICO.
ABSTRACT The aim of the present work is to evaluate the changes on the phenylalanine ammonia lyase (PAL) activity, phenolic compounds accumulation and photochemical efficiency in leaves of P. glandulosa treated with Cd2+ (0.001 M) and Cu2+ (0.52 M) concentrations for 96 h under hydroponic conditions. The results showed that only leaves treated with copper had a decrease in photochemical efficiency and leaf epidermal polyphenols in P. glandulosa leaves after 96 h of exposure. On the other hand the reverse-phase HPLC analysis revealed higher levels of phenolic compound (gallic, vanillic and caffeic acids) and flavonoids (rutin and kaempferol-3-O-glucosides) in plant leaves from Cu and Cd-treatments with respect to control plants. Finally, highest increments...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Prosopis glandulosa; Flavonoids; Chlorophyll a fluorescence.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401465

The Role of the Humic Substances in the Fractioning of Heavy Metals in Rodrigo de Freitas Lagoon, Rio de Janeiro - Brazil
Provedor de dados: 42
Autores: FONSECA,ESTEFAN M. DA; BAPTISTA NETO,JOSÉ A.; MCALISTER,JOHN; SMITH,BERNARD; FERNANDEZ,MARCOS A.; BALIEIRO,FABIANO C.
One of the main results of the processes related to urbanization is the contamination of the adjacent water bodies. Inserted in this context, the Rodrigo de Freitas lagoon is situated in the south zone of the city of Rio de Janeiro. This ecosystem receives several inputs containing all sorts of pollutants, including heavy metals. The present work aimed to study the partitioning of heavy metals in the sediments of Rodrigo de Freitas and the influence of organic matter in this fractionation dynamic. The results of these analyses presented the contents of organic matter as an important metal-capturing agent. Fractionation of organic matter resulted in a predominance of humine. Heavy metal partitioning showed that the metals bound by the water-soluble phase...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil; Rio de Janeiro; Rodrigo de Freitas lagoon; Heavy metals; Humic acids.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401289

Geochemical behavior of heavy metals in differents environments in Rodrigo de Freitas lagoon - RJ/Brazil
Provedor de dados: 42
Autores: Fonseca,Estefan M; Baptista Neto,José A; Fernandez,Marcos A; Mcalister,John; Smith,Bernard.
The accelerated urbanisation without a planning, brought several environmental problems to Rio de Janeiro coastal zone, especially in areas such as Rodrigo de Freitas lagoon, which receives a great amount of untreated sewage every day. To assess the nature, potentially sources and extent of heavy metal pollution in the lagoon, sediments from the surrounding streets, from the entrance of the main canal that drains to the lagoon and from the bottom of the lagoon were collected and analysed by a modified selective extraction procedure in order to study the geochemical partitioning and bioavailability of Zn, Cu, Cr, Ni and Pb in these three compartments. The present study verified an increase in the Cu, Pb and Zn concentrations in the north of the Rodrigo de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Rodrigo de Freitas lagoon; Sediments.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000200008

Air quality assessment in different urban areas from Rio Grande do Sul state, Brazil, using lichen transplants
Provedor de dados: 42
Autores: KOCH,NATÁLIA MOSSMANN; LUCHETA,FABIANE; KÄFFER,MÁRCIA ISABEL; MARTINS,SUZANA MARIA DE AZEVEDO; VARGAS,VERA MARIA FERRÃO.
Abstract Based on the need to monitor air pollution and on the importance of doing it with biological organisms, the present work had as main objective to assess air quality in urban areas through lichen transplants. Besides, we also tested whether there were differences among the studied sites, aiming to point out the main pollution characteristics of the areas. The monitoring was carried out in seven cities, which varied from mainly rural to mainly industrial, in Rio Grande do Sul, southern Brazil. The foliose lichen Parmotrema tinctorum was used as the biomonitor species. Physiological tests and contents of sulphur and heavy metals were measured in the lichen thalli. Other pollutants assessed through air samplers were available for some cities, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Air pollution; Biomonitoring; Greenhouse gases; Heavy metals; Lichenized fungi; Particulate matter.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502233

Mercury content in the fur of jaguars (Panthera onca) from two areas under different levels of gold mining impact in the Brazilian Pantanal
Provedor de dados: 42
Autores: MAY JÚNIOR,JOARES A.; QUIGLEY,HOWARD; HOOGESTEIJN,RAFAEL; TORTATO,FERNANDO R.; DEVLIN,ALLISON; CARVALHO JÚNIOR,RUI M. DE; MORATO,RONALDO G.; SARTORELLO,LEONARDO R.; RAMPIM,LILIAN E.; HABERFELD,MARIO; PAULA,ROGÉRIO C. DE; ZOCCHE,JAIRO JOSÉ.
ABSTRACT The Pantanal is the largest inland wetland in the world and is under increasing anthropogenic threats, including long-term regionally intensive gold mining practices. Gold mining activities are known to cause the release of harmful pollutants such as mercury (Hg) to the surrounding environment. Jaguars (Panthera onca (Linnaeus, 1758)) are apex predators, and therefore show great potential to accumulate Hg by biomagnification. We hypothesize that total Hg content in the fur of jaguars from two sites within the Brazilian Pantanal would be significantly different as a function of distance from active gold mining operations. The Hg content was determined by fluorescence spectrometry. The mean ± SD Hg content in jaguars from the study site influenced...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biomagnification; Heavy metals; Mammal; Wetland.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502129

Ecotoxicological studies on the pejerrey (Odontesthes bonariensis, Pisces Atherinopsidae)
Provedor de dados: 47
Autores: Carriquiriborde,Pedro; Ronco,Alicia.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Odontesthes bonariensis; Ecotoxicology; Environmental pollution; Heavy metals; Pesticides.
Ano: 2006
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452006000100012

Study of potential impacts of using sewage sludge in the amendment of desert reclaimed soil on wheat and jews mallow plants
Provedor de dados: 52
Autores: Mazen,Ahmed; Faheed,Fayza A; Ahmed,Atef F.
This investigation was conducted to study the impacts of using sewage sludge at different concentrations (0, 10, 25, 50, 75%) in amendment of desert reclaimed soil properties and some physiological aspects in wheat and jews mallow plants. Generally adding sewage sludge to desert soil improved the soil texture, raised the organic matter contents, water holding capacity and lowered pH value. The contents of NPK gradually increased as the ratio of sewage sludge increased. The fresh and dry weights and biosyntheses of pigment contents of the variously treated test plants were increased by increasing the sewage sludge levels in the soil. Also, total carbohydrate and protein contents of sewage sludge-treated test plants were positively affected. With respect to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Protein; Proline; Free amino acids.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132010000400022

Heavy Metals and 2,4-Dinitrophenol Impact on Some Physiological and Biochemical Parameters in Capsicum Species
Provedor de dados: 52
Autores: Todirascu-Ciornea,Elena; Dumitru,Gabriela.
Abstract The accumulation of heavy metals and of pesticides in the soil have a negative impact on Capsicum chinense var. Aji Mochero and Capsicum baccatum var. pendulum Bishop's Crown species, the present work highlighting the exerted influence on the superoxid-dismutase activity, catalase and peroxidase - as enzymes implied in the removal of H2O2, of O2- radical and of ion HO- that have devastating effects on the vegetable cell, on the Krebs cycle’s dehydrogenases - as main way to produce energy, respectively of the chlorophyll a, b and carotenes - as photoassimilatory pigments, but also as biologic antioxidants.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dinitrophenol; Heavy metals; Capsicum; Oxidative stress.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132019000100413

Heavy metal accumulation in the leaves, stem and root of the invasive submerged macrophyte Myriophyllum spicatum L. (Haloragaceae): an example of Kadin Creek (Mugla, Turkey)
Provedor de dados: 52
Autores: Yabanli,Murat; Yozukmaz,Aykut; Sel,Fatma.
In this study, the existence of heavy metals such as chromium (Cr), arsenic (As), cadmium (Cd), mercury (Hg) and lead (Pb) their distribution in the organs of plant and their bioaccumulation rates in water samples and Myriophyllum spicatum which were collected from the Kadin Creek in seasonal periods between 2011 and 2012 were analyzed. Heavy metal concentrations in the mineralized plant and water samples were determined with Inductive coupled plasma with mass spectroscopy (ICP-MS). Results showed the maximum heavy metal concentrations, in the root and minimum heavy metal concentrations, except chromium, in the stem. The distribution of heavy metals As, Cd, Hg and Pb was in the form of root &gt; leaf &gt; stem; the distribution of Cr was in the root &gt;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Myriophyllum spicatum; Kadin Creek.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132014000300018

Transition metal rates in latosol twice treated with sewage sludge
Provedor de dados: 52
Autores: Pigozzo,Ana Tereza Jordão; Lenzi,Ervim; Luca Junior,Jorge de; Scapim,Carlos Alberto; Costa,Antonio Carlos Saraiva da.
Agricultural recycling of sewage sludge has been a source of accumulation of heavy metals in the environment which may reach toxic levels and cause serious damage to the biota. Field experiments were undertaken for two agricultural years (2000 and 2002) and effects of two sewage sludge applications were evaluated through the extraction of (essential and non-essential) transition metals by diethylenetriaminepentaacetic acid (DTPA) extractor in a medium texture dystrophic Dark Red Latosol. Cd, Ni, Co, Pb and Cr were not detected. Application of sewage sludge initially caused a slight pH rise in the soil; later pH lowered and kept itself close to the starting level. It could be concluded that through consecutive sludge application, extractable rates of Fe and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Sewage sludge; DTPA; Biosolid; Nutrient rates.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000400020

Characterization and Metal Detoxification Potential of Moderately Thermophilic Bacillus cereus from Geothermal Springs of Himalaya
Provedor de dados: 52
Autores: Ghalib,Aslam Khan; Yasin,Muhammad; Faisal,Muhammad.
Two thermophilic Bacillus cereus strains (B. cereus-TA2 and B. cereus-TA4) used in the present study were isolated from the geothermal spring of Hunza valley, Gilgit, Pakistan. They showed the ability to withstand and grow at high temperature (85°C). Both these strains could resist multiple metals (copper, cadmium, mercury, manganese, zinc, arsenic, chromium and selenium). Strain B. cereus-TA4 reduced Cr (VI) at pH 5.0 to 9.0 but maximum reduction (83%) was observed at pH 7.0 after 48 h when initially supplied with 200 µg mL-1of K2CrO4. Lower initial concentrations such as 100 µg mL-1 supported higher reduction (90 to 95%) than that of high concentration such as 500 µg mL-1 (20 to 30%). Both the strains reduced nearly 70% of Se (IV) after 48 h of growth at...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromium; Bioremediation; Selenium; Heavy metals.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132014000400554

Estimation of some heavy metals in polluted well water and mercury accumulation in broiler organs
Provedor de dados: 52
Autores: Hussein,Hussein Khamis; Abu-Zinadah,Osama Abdullah; EL-Rabey,Haddad Abdulsameih; Meerasahib,Mohammed Fareez.
The aim of this study was to investigate the relationship between the concentrations of heavy metals in well water and bioaccumulation of the most abundant metals in chicken tissues in some areas in the province of Mecca Almokaramah, Saudi Arabia. Among the heavy metals (Cd, Zn, Cr, Mn, Cu Hg, Pb and Ni) studied, mercury (Hg) revealed highest in concentration in well waters. The concentration of mercury in the ground water, beside in liver, kidney, muscle and blood samples of ten chickens from each of four poultry- production farms were estimated using atomic absorption spectrophotometer. The results showed that the kidney followed by liver had the highest bioaccumulation of mercury in all farm samples. The level of mercury in the ground water was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Environmental toxicology; Ground water; Heavy metals; Mercury; Bioaccumulation-chicken histopathology.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132013000500007

Temporal and spatial variation on heavy metal concentrations in the bivalve Perna perna (LINNAEUS, 1758) on the northern coast of Rio de Janeiro State, Brazil
Provedor de dados: 52
Autores: Ferreira,Alexandre Gomes; Machado,André Luís dos Santos; Zalmon,Ilana Rosental.
Heavy metal (Cd, Cr, Cu, Fe, Mn, Ni, Pb and Zn) concentrations were studied in Perna perna from three beaches (Barra do Furado, Buena and Ponta do Retiro) on the northern coast of Rio de Janeiro State by ICP-AES. The average concentration was 0.3 ± 0.04 (Cd); 1.9 ± 0.6 (Cr); 6.1 ± 0.7 (Cu); 1,130 ± 113 (Fe); 22 ± 3.2 (Mn); 9.3 ± 4.6 (Ni); 0.4 ± 0.2 (Pb); 44 ± 5.8 (Zn) µg.g-1 dry weight. There were no significant difference for almost all the studied metals in relation to sex. Although, significant spatial variations (p &lt; 0.05) occurred for Cr, Pb and Ni with higher values for Barra do Furado. Temporal variations were significant (p &lt; 0.05) at the three beaches, however, no trends of accumulation were observed. The metal concentrations were similar to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Mollusk; Spatial variation; Temporal variation.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000200020

Uptake of cadmium by Pseudokirchneriella supcapitata
Provedor de dados: 52
Autores: Casiraghi,Magela Paula; Luporini,Samuel; Silva,Eduardo Mendes da.
In this work the microalgae Pseudokirchneriella supcapitata was used for the removal of the cadmium in liquids. The accumulations of metal ions by the alga occur in two stages: a very fast absorption (passive adsorption) proceeded by a slower absorption (activate absorption). A mathematical model based on the surface absorption and on the transport into the interior of the cellular membrane was developed. The simulation model kinetic parameters were experimentally obtained. Through the results observed, the mathematical model was shown to be suitable when compared to the experimental results, confirming the validation of the mathematical model.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cadmium; Microalgae; Heavy metals; Mathematical model.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000800019

Effect of Heavy Metals on Liver, Kidney, Gills and Muscles of Cyprinus carpio and Wallago attu inhabited in the Indus
Provedor de dados: 52
Autores: Mahboob,Shahid; Kausar,Shazia; Jabeen,Farhat; Sultana,S.; Sultana,T.; Al-Ghanim,K.A.; Hussain,Bilal; Al-Misned,Fahad; Ahmed,Z.
ABSTRACT: The present study was aimed to evaluate the effect of heavy metals on an important tissue of two fish species Cyprinus carpio and Wallago attu, sampled from the Indus river, Mianwali District, Pakistan. The concentration of selected heavy metals Fe, Cr, Cu, and in gills, muscles, kidney and liver was compared with an International standard of food fish. The overall metal concentrations among different weight categories in C. carpio were in the order of Fe &gt; Cu &gt; Cr &gt;. In W. attu the overall accumulation of these metals were, in order of Fe &gt; Cu &gt; Cr &gt; Pb The order of accumulation of metals in gills and muscle of C. carpio was Fe &gt; Cr &gt; Pb &gt; Cu; kidney and muscles of W. attu was Fe &gt; Cr &gt; Cu &gt; Pb; liver Fe &gt;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: River; Heavy metals; Fish; Weight; Pollution.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132016000100334

Zinc detoxification by a cyanobacterium from a metal contaminated bay in Brazil
Provedor de dados: 52
Autores: Andrade,Luciana; Keim,Carolina N.; Farina,Marcos; Pfeiffer,Wolfgang C.
We describe here the trapping of zinc in polyphosphate granules of the cyanobacterium Synechocystis aquatilis NPBS-3. Cells were cultured in 25 µM of zinc chloride and prepared for electron microscopy and energy-dispersive X-ray analysis. Some ultrastructural features were changed by zinc exposure, the increase of glycogen granules number being the main change. The polyphosphate granules contained phosphorus, sulphur, calcium, iron and zinc. The trapping of zinc in polyphosphate granules seemed to be an effective way of detoxifying the metal and surviving in the bay. As a non-specific mechanism, these polyphosphate granules could also be effective in trapping other metals in excess.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Zinc; Sepetiba Bay; Polyphosphate granules; Glycogen granules; Detoxification.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000100020

Biomonitoring of Pb and Cd in two impacted watersheds in Southeast Brazil, using the freshwater mussel Anodontites trapesialis (Lamarck, 1819) (Bivalvia : Mycetopodidae) as a biological monitor
Provedor de dados: 52
Autores: Tomazelli,Andréa C.; Martinelli,Luiz A.; Avelar,Wagner E. P.; Camargo,Plínio B. de; Fostier,Anne-Helene; Ferraz,Epaminondas S. B.; Krug,Francisco J.; Santos Júnior,Dário.
Studies were carried out to investigate the contamination of Piracicaba and Mogi-Guaçu River basins (São Paulo State, Southeastern, Brazil) for heavy metals (Cd and Pb), using the limnic bivalve Anodontites trapesialis as a biological monitor. The results showed that the concentrations of Pb were higher than the control group in both basins, showing the bioavailability of this non-essential element in the basins. The concentrations were higher in the Mogi-Guaçu than in the Piracicaba basin, and in the slightly contaminated sites in both basins. There was no correlation between the degree of human impact and Cd and Pb concentrations, it was not possible to infer about concentrations of these heavy metals in the bivalves based only in a broad evaluation of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biomonitoring; Heavy metals; Mussels; Piracicaba; Mogi-Guaçu; Brazil.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132003000400022

Heavy Metal Bioaccumulation in Enteromorpha intestinalis, (L.) Nees, a Macrophytic Algae: The Example of Kadin Creek (Western Anatolia)
Provedor de dados: 52
Autores: Yozukmaz,Aykut; Yabanli,Murat; Sel,Fatma.
ABSTRACT This study aims to specify the amount of ten heavy metals (Al, Cr, Mn, Ni, Cu, Zn, As, Cd, Hg, Pb) in water, sediment and Enteromorpha intestinalis samples gathered from Kadin Creek in seasonal periods in 2011 and 2012 and to reveal bioaccumulation capability of this macrophytic algae. In this regard, heavy metal concentrations in the gathered samples were determined first with mineralization and then via inductively coupled plasma mass spectroscopy (ICP-MS) method. Findings suggested that algae could be used as an indicator in freshwater ecosystems in terms of studied heavy metals. With regard to bioconcentration factor values, in terms of water, algae accumulated aluminum the most and cadmium the least (Al &gt; Cu &gt; As &gt; Zn &gt; Cr &gt; Mn...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Enteromorpha intestinalis; Kadın Creek.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132018000100701

Bioaccumulation and chemical forms of cadmium, copper and lead in aquatic plants
Provedor de dados: 52
Autores: Hu,JinZhao; Zheng,AiZhen; Pei,DongLi; Shi,GuoXin.
The cadmium(Cd), copper(Cu) and lead(Pb) accumulation, as well as their relative content of different chemical forms in Sagittaria sagittifolia L. and Potamogeton crispus L. were determined. The results showed that both the plants had the ability to accumulate large amounts of Cd, Cu and Pb, and they absorbed metals in dose-dependent manners. The roots of S. sagittifolia appeared more sensitive to Cd and Pb than the leaves of P. crispus. The potential of Cu uptake by these two plant tissues was similar. Under the same concentration, the uptake of Cu for both the plants was higher than Pb and Cd, while that of Pb was lowest. The Cd, Cu and Pb existed with various forms in the plants. Cd and Pb were mainly in the NaCl extractable form in S. sagittifolia and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Phytoextraction; Macrophytes; Sagittaria sagittifolia L.; Potamogeton crispus L.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132010000100029

Preliminary assessment of heavy metal levels in Mytella falcata (Bivalvia, Mytilidae) from Bacanga River estuary, São Luis, State of Maranhão, Northeastern Brazil
Provedor de dados: 57
Autores: CARVALHO,G. P. de; CAVALCANTE,P. R. S.; CASTRO,A. C. L. de; ROJAS,M. O. A. I.
The concentrations of Cu, Zn, Pb, and Cd were determined in the mussel Mytella falcata from the Bacanga River estuary, in order to evaluate the potential role of domestic effluents released "in natura" on the quality of the estuarine environment with consequences to shellfish resources. Cu concentrations ranged from 5.2 mg.g-1 to 13.1 mg.g-1, while Zn concentrations ranged from 49.1 mg.g-1 to 76.3 mg.g-1. Pb and Cd showed concentrations lower than 2 mg.g-1. The results showed low concentrations of Cu, Pb and Cd in the filter-feeding Mytella falcata in the study area in comparison with the maximum values stablished to foods by the Brazilian Government (Decree Law Nº 55,871). Finally, Zn presented slightly higher values than the maximum ones stablished by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Bivalves; Mytella falcata; Estuary; Pollution.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000100003

Peripheral markers of oxidative stress in chronic mercuric chloride intoxication
Provedor de dados: 56
Autores: Gutierrez,L.L.P.; Mazzotti,N.G.; Araújo,A.S.R.; Klipel,R.B.; Fernandes,T.R.G.; Llesuy,S.F.; Belló-Klein,A.
The present study was designed to evaluate the time course changes in peripheral markers of oxidative stress in a chronic HgCl2 intoxication model. Twenty male adult Wistar rats were treated subcutaneously daily for 30 days and divided into two groups of 10 animals each: Hg, which received HgCl2 (0.16 mg kg-1 day-1), and control, receiving the same volume of saline solution. Blood was collected at the first, second and fourth weeks of Hg administration to evaluate lipid peroxidation (LPO), total radical trapping antioxidant potential (TRAP), and superoxide dismutase (Cu,Zn-SOD), glutathione peroxidase (GPx), glutathione-S-transferase (GST), and catalase (CAT). HgCl2 administration induced a rise (by 26%) in LPO compared to control (143 ± 10 cps/mg...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Heavy metals; Antioxidant enzymes; Lipid peroxidation; Total radical-trapping antioxidant potential; HgCl2.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2006000600009

Evaluation and enhancement of heavy metals bioremediation in aqueous solutions by Nocardiopsis sp. MORSY1948, and Nocardia sp. MORSY2014
Provedor de dados: 58
Autores: El-Gendy,Mervat Morsy Abbas Ahmed; El-Bondkly,Ahmed Mohamed Ahmed.
ABSTRACT An analysis of wastewater samples collected from different industrial regions of Egypt demonstrated dangerously high levels of nickel (0.27-31.50 mg L-1), chromium (1.50-7.41 mg L-1) and zinc (1.91-9.74 mg L-1) in the effluents. Alarmingly, these heavy metals are among the most toxic knownones to humans and wildlife. Sixty-nine Actinomycete isolates derived from contaminated sites were evaluated under single, binary, and ternary systems for their biosorption capacity for Ni2+, Cr6+ and Zn2+ from aqueous solutions. The results of the study identified isolates MORSY1948 and MORSY2014 as the most active biosorbents. Phenotypic and chemotypic characterization along with molecular phylogenetic evidence confirmed that the two strains are members of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biosorption; Heavy metals; Dead and live biomass; Nocardiopsis; Nocardia; Wastewater.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822016000300571

Susceptibility of Arcobacter butzleri to heavy metals
Provedor de dados: 58
Autores: Otth,Laura; Solís,Gabriela; Wilson,Myra; Fernández,Heriberto.
The susceptibility of 50 strains of Arcobacter butzleri isolated from chicken liver [12], mussels [18], river water [6] and bovine [5], duck [2] and pelicans [7] feces to mercury (Hg), chromium (Cr), silver (Ag), nickel (Ni), cobalt (Co), iron (Fe), manganese (Mn), molybdenum (Mo) and lead (Pb) was determined.All the strains were resistant to Mo, Mn, Ni, Co, Pb and Fe and susceptible to Hg, Ag and Cr. MIC values showed high variability, indicating a non homogeneous behavior among the strains.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Arcobacter butzleri; Heavy metals; Resistance.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822005000300015

Enrichment of arbuscular mycorrhizal fungi in a contaminated soil after rehabilitation
Provedor de dados: 58
Autores: Lopes Leal,Patrícia; Varón-López,Maryeimy; Gonçalves de Oliveira Prado,Isabelle; Valentim dos Santos,Jessé; Fonsêca Sousa Soares,Cláudio Roberto; Siqueira,José Oswaldo; de Souza Moreira,Fatima Maria.
Abstract Spore counts, species composition and richness of arbuscular mycorrhizal fungi, and soil glomalin contents were evaluated in a soil contaminated with Zn, Cu, Cd and Pb after rehabilitation by partial replacement of the contaminated soil with non-contaminated soil, and by Eucalyptus camaldulensis planting with and without Brachiaria decumbens sowing. These rehabilitation procedures were compared with soils from contaminated non-rehabilitated area and non-contaminated adjacent soils. Arbuscular mycorrhizal fungi communities attributes were assessed by direct field sampling, trap culture technique, and by glomalin contents estimate. Arbuscular mycorrhizal fungi was markedly favored by rehabilitation, and a total of 15 arbuscular mycorrhizal fungi...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glomeromycota; Heavy metals; Soil contamination; Mycorrhiza; Revegetation.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822016000400853

Application of a bacterial extracellular polymeric substance in heavy metal adsorption in a co-contaminated aqueous system
Provedor de dados: 58
Autores: Martins,Paula Salles de Oliveira; Almeida,Narcisa Furtado de; Leite,Selma Gomes Ferreira.
The application of a bacterial extracellular polymeric substance (EPS) in the bioremediation of heavy metals (Cd, Zn and Cu) by a microbial consortium in a hydrocarbon co-contaminated aqueous system was studied. At the low concentrations used in this work (1.00 ppm of each metal), it was not observed an inhibitory effect on the cellular growing. In the other hand, the application of the EPS lead to a lower concentration of the free heavy metals in solution, once a great part of them is adsorbed in the polymeric matrix (87.12% of Cd; 19.82% of Zn; and 37.64% of Cu), when compared to what is adsorbed or internalized by biomass (5.35% of Cd; 47.35% of Zn; and 24.93% of Cu). It was noted an increase of 24% in the consumption of ethylbenzene, among the gasoline...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: EPS; Co-contamination; Heavy metals; Natural attenuation.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822008000400034

Bioaccumulation of copper, zinc, cadmium and lead by Bacillus sp., Bacillus cereus, Bacillus sphaericus and Bacillus subtilis
Provedor de dados: 58
Autores: Costa,Antonio Carlos Augusto da; Duta,Flavia Pereira.
This work presents some results on the use of microbes from the genus Bacillus for uptake of cadmium, zinc, copper and lead ions. Maximum copper bioaccumulations were 5.6 mol/g biomass for B. sphaericus, 5.9 mol/g biomass for B. cereus and B. subtilis, and 6.4 mol/g biomass for Bacillus sp. Maximum zinc bioaccumulations were 4.3 mol/g biomass for B. sphaericus, 4.6 mol/g biomass for B. cereus, 4.8 mol/g biomass for Bacillus sp. and 5.0 mol/g biomass for B. subtilis. Maximum cadmium bioaccumulations were 8.0 mol/g biomass for B. cereus, 9.5 mol/g biomass for B. subtilis, 10.8 mol/g biomass for Bacillus sp. and 11.8 mol/g biomass for B. sphaericus. Maximum lead biomaccumulations were 0.7 mol/g biomass for B. sphaericus, 1.1 mol/g biomass for B. cereus, 1.4...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bioaccumulation; Bacillus; Heavy metals.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822001000100001

Bioemulsifier production by Microbacterium sp. strains isolated from mangrove and their application to remove cadmiun and zinc from hazardous industrial residue
Provedor de dados: 58
Autores: Aniszewski,Erick; Peixoto,Raquel Silva; Mota,Fábio Faria; Leite,Selma Gomes Ferreira; Rosado,Alexandre Soares.
The contamination of ecosystems with heavy metals is an important issue in current world and remediation technologies should be in according to environmental sustainability concept. Bioemulsifier are promising agents to be used in metal removal and could be effective to many applications in environmental industries. The aims of this work was screening the potential production of bioemulsifier by microorganisms isolated from an oil contaminated mangrove, and evaluate cadmium and zinc removal potential of those strains from a hazardous industrial residue. From that, bioemulsifier-producing bacteria were isolated from urban mangrove sediments. Four isolates were identified as Microbacterium sp by 16S rRNA analysis and were able to reduce up to 53.3% of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biosemulsifier; Heavy metals; Zinc; Cadmium; Microbacterium; Bioremediation.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822010000100033

Draft genome sequence of Exiguobacterium aurantiacum strain PN47 isolate from saline ponds, known as “Salar del Huasco”, located in the Altiplano in the North of Chile
Provedor de dados: 58
Autores: Strahsburger,Erwin; Zapata,Felipe; Pedroso,Inti; Fuentes,Derie; Tapia,Paz; Ponce,Raul; Valdes,Jorge.
ABSTRACT In this report, we present a draft genome of 2,886,173 bp of an Exiguobacterium aurantiacum strain PN47 isolate from the sediment of a saline pond named “Salar del Huasco” in the Altiplano in the North of Chile. Strain PN47 encodes adaptive characteristics enabling survival in extreme environmental conditions of high heavy metal and salt concentrations and high alkalinity.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alkaline; Arsenic; Heavy metals; Pigments.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822018000100007

Screening of Trichoderma isolates for their potential of biosorption of nickel and cadmium
Provedor de dados: 58
Autores: Nongmaithem,Nabakishor; Roy,Ayon; Bhattacharya,Prateek Madhab.
Abstract Fourteen Trichoderma isolates were evaluated for their tolerance to two heavy metals, nickel and cadmium. Three isolates, MT-4, UBT-18, and IBT-I, showed high levels of nickel tolerance, whereas MT-4, UBT-18, and IBT-II showed better tolerance of cadmium than the other isolates. Under nickel stress, biomass production increased up to a Ni concentration of 60 ppm in all strains but then decreased as the concentrations of nickel were further increased. Among the nickel-tolerant isolates, UBT-18 produced significantly higher biomass upon exposure to nickel (up to 150 ppm); however, the minimum concentration of nickel required to inhibit 50% of growth (MIC50) was highest in IBT-I. Among the cadmium-tolerant isolates, IBT-II showed both maximum biomass...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Biosorption; Trichoderma; MIC50; Fungistasis.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822016000200305

Microbial activity, arbuscular mycorrhizal fungi and inoculation of woody plants in lead contaminated soil
Provedor de dados: 58
Autores: Gattai,Graziella S; Pereira,Sônia V; Costa,Cynthia M. C; Lima,Cláudia E. P; Maia,Leonor C.
The goals of this study were to evaluate the microbial activity, arbuscular mycorrhizal fungi and inoculation of woody plants (Caesalpinia ferrea, Mimosa tenuiflora and Erythrina velutina) in lead contaminated soil from the semi-arid region of northeastern of Brazil (Belo Jardim, Pernambuco). Dilutions were prepared by adding lead contaminated soil (270 mg Kg-1) to uncontaminated soil (37 mg Pb Kg soil-1) in the proportions of 7.5%, 15%, and 30% (v:v). The increase of lead contamination in the soil negatively influenced the amount of carbon in the microbial biomass of the samples from both the dry and rainy seasons and the metabolic quotient only differed between the collection seasons in the 30% contaminated soil. The average value of the acid phosphatase...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: AMF; Contaminated soil; Heavy metals; Mycorrhizae; Semi-arid.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822011000300004

Inoculation with mycorrhizal fungi modifies proline metabolism and increases chromium tolerance in pepper plants (Capsicum annuum L.)
Provedor de dados: 61
Autores: Ruscitti,Marcela; Arango,María; Ronco,Marta; Beltrano,José.
In general, heavy metals interfere with several physiological processes and reduce plant growth. Plants naturally establish symbiotic associations with soil microorganisms, such as mycorrhizal fungi. The aim of this research was to determine if inoculation with mycorrhizal fungi increases tolerance to Cr, evidenced by growth and biochemical parameters and the effect on roots membranes in Capsicum annum. Plants were either non-inoculated or inoculated with Glomus mosseae or Glomus intraradices, and grown in the presence of different concentration of Cr (K2Cr2O4) in soil. Pepper plants grown without Cr behaved as mycotrophic species. At the highest concentration (200 μM K2Cr2O4), Cr reduced root colonization by G. mosseae or G. intraradices (to 23 and 20%...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Electrolytes leakage; Glomus intraradices; Glomus mosseae; Heavy metals.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202011000100004

Photosynthetic performance of Salvinia natans exposed to chromium and zinc rich wastewater
Provedor de dados: 61
Autores: Dhir,Bhupinder; Sharmila,P.; Saradhi,P. Pardha.
Investigations were carried out to evaluate alterations in photosynthetic performance of Salvinia natans (L.) exposed to chromium (Cr) and zinc (Zn) rich wastewater. Accumulation of high levels of Cr and Zn in plants affected photosynthetic electron transport. Photosystem- (PS) II-mediated electron transport was enhanced in plants exposed to Cr rich wastewater while a decline was observed in Zn-exposed plants. Photosystem-I-mediated electron transport increased in plants exposed to Cr and Zn rich wastewater. Efficiency of photosystem II (Fv/Fm) measured by fluorescence did not show any significant change in Cr-exposed plants but a decrease was observed in Zn-exposed plants as compared to the control. The enhancement in PS I-induced cyclic electron...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carbon assimilation; Electron transport; Heavy metals; Photophosphorylation; Redox status.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202008000100007

Response of Crotalaria juncea to nickel exposure
Provedor de dados: 61
Autores: Cardoso,Patrícia Felippe; Gratão,Priscila Lupino; Gomes-Junior,Rui Alberto; Medici,Leonardo Oliveira; Azevedo,Ricardo Antunes.
The response of Crotalaria juncea seedlings to nickel (Ni) was investigated. Ni was shown to accumulate mainly in the root system, with little being translocated to the shoots. Catalase (CAT) and glutathione reductase (GR) responses to Ni were also analyzed. CAT activity did not exhibit a clear trend in response to Ni exposure, whereas GR activity appeared to respond to the stress induced by Ni. The results suggest that in C. juncea GR participates in the detoxification of Ni-induced reactive oxygen species via the glutathione-ascorbate cycle.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidant enzymes; Heavy metals; Nickel; Reactive oxygen species.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202005000200010

Dietary intake and health effects of selected toxic elements
Provedor de dados: 61
Autores: Silva,André Luiz Oliveira da; Barrocas,Paulo R.G.; Jacob,Silvana do Couto; Moreira,Josino Costa.
Anthropogenic activities have being contributing to the spread of toxic chemicals into the environment, including several toxic metals and metalloids, increasing the levels of human exposure to many of them. Contaminated food is an important route of human exposure and may represent a serious threat to human health. This mini review covers the health effects caused by toxic metals, especially Cd, Hg, Pb and As, the most relevant toxic elements from a human health point of view.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bioavailability; Contamination; Heavy metals; Metal toxicity.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202005000100007

Cadmium toxicity in plants
Provedor de dados: 61
Autores: Benavides,María P.; Gallego,Susana M.; Tomaro,María L.
Heavy metals are important environmental pollutants and their toxicity is a problem of increasing significance for ecological, evolutionary, nutritional, and environmental reasons. Plants posses homeostatic cellular mechanisms to regulate the concentration of metal ions inside the cell to minimize the potential damage that could result from the exposure to nonessential metal ions. This paper summarizes present knowledge in the field of higher plant responses to cadmium, an important environmental pollutant. Knowledge concerning metal toxicity, including mechanisms of cadmium homeostasis, uptake, transport and accumulation are evaluated. The role of the cell wall, the plasma membrane and the mycorrhizas, as the main barriers against cadmium entrance to the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cadmium; Heavy metals; Metal toxicity; Phytochelatins; Oxidative stress.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202005000100003

Tolerance and prospection of phytoremediator woody species of Cd, Pb, Cu and Cr
Provedor de dados: 61
Autores: Almeida,Alex-Alan F. de; Valle,Raúl R.; Mielke,Marcelo S.; Gomes,Fábio P.
High concentrations of Cd, Pb, Cu and Cr can cause harmful effects to the environment. These highly toxic pollutants constitute a risk for aquatic and terrestrial life. They are associated with diverse bioavailable geochemical fractions, like the water-soluble fraction and the exchangeable fraction, and non-available fractions like those associated with the crystalline net of clays and silica minerals. Depending upon their chemical and physical properties we can distinguish different mechanisms of metal toxicity in plants, such as production of reactive oxygen species from auto-oxidation, blocking and/or displacement of essential functional groups or metallic ions of biomolecules, changes in the permeability of cellular membranes, reactions of sulphydryl...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Decontamination; Heavy metals; Hyperaccumulation; Phytodegradation; Phytostabilization; Phytotoxicity.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202007000200001

Mycorrhiza influence on maize development under Cd stress and P supply
Provedor de dados: 61
Autores: Andrade,Sara A. L. de; Silveira,Adriana P. D. da.
The role of arbuscular mycorrhizal fungi (AMF) on cadmium (Cd) accumulation and on the possible attenuation of Cd stress was studied in maize plants (Zea mays L. var. Exceller). Plants inoculated or not with Glomus macrocarpum were exposed to Cd (0-20 µmol L-1), at two P levels (5 and 10 mg L-1) in the nutrient solution. The experiment was conducted in a hydroponic system, using a randomized 2 x 2 x 2 factorial design. The mycorrhiza-Cd interaction on plant growth, nutrients and Cd accumulation, AMF root colonization and on extra-radical mycelium was investigated. Mycorrhiza promoted plant growth whereas Cd addition reduced plant biomass production. No difference in plant Cd concentrations was found between mycorrhizal (M) and non-mycorrhizal (NM) plants,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Arbuscular mycorrhizal fungi; Cd distribution; Extra-radical mycelium; Heavy metals; Peroxidase; Phosphorus.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202008000100005

Changes in the antioxidative enzyme activities and lipid peroxidation in wheat seedlings exposed to cadmium and lead stress
Provedor de dados: 61
Autores: Dey,Surjendu K.; Dey,Jayashree; Patra,Sanjukta; Pothal,Debasmita.
Wheat seedlings were grown in presence of CdCl2 (0-200 µM) and Pb(NO3)2 (0-2000 µM) separately. The growth of metal-treated seedlings was significantly depressed. The activities of antioxidative enzymes namely superoxide dismutase (SOD), catalase (CAT) and guaiacol peroxidase (POX) were altered both in root and shoot tissues of 7-d-old seedlings. Under Cd stress, SOD activity in roots was undetectable even at the lowest Cd concentration (50 µM) whereas in shoots it declined sharply with increasing Cd levels. The activity of CAT declined to a greater extent in roots than in shoots. Even though the POX activity increased nine times in shoots, a decreasing trend was observed in root tissues due to Cd stress. Under Pb stress, the induction in SOD activity and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Catalase; Heavy metals; Peroxidase; Superoxide dismutase; Triticum.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202007000100006

Changes in growth and superoxide dismutase activity in Hydrilla verticillata L. under abiotic stress
Provedor de dados: 61
Autores: Panda,Sanjib Kumar; Khan,Mohammad Hussain.
A study was made of the role of various heavy metals (chromium, zinc, copper and cadmium) together with the effects of NaCl-salinity, PEG-mediated water stress and temperature on growth and superoxide dismutase (SOD) activity in hydrilla (Hydrilla verticillata L.). Almost all metals studied reduced growth but presented a modulatory effect at lower concentrations. NaCl-salinity, water stress and temperature treatments also reduced growth. SOD activity was inhibited by both chromium and zinc but increased by copper and cadmium. NaCl-salinity increased SOD activity while water stress decreased it. SOD showed thermostability with a higher activity being recorded at 45ºC.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Growth; Heavy metals; NaCl; PEG; Superoxide dismutase; Temperature.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202004000200007

Transport and detoxification of manganese and copper in plants
Provedor de dados: 61
Autores: Ducic,Tanja; Polle,Andrea.
Heavy metals like Mn and Cu, though essential for normal plant growth and development, can be toxic when present in excess in the environment. For normal plant growth maintenance of metal homeostasis is important. Excess uptake of redox active elements causes oxidative destruction. Thus, uptake, transport and distribution within the plant must be strongly controlled. Regulation includes precisely targeted transport from the macro-level of the tissue to the micro-level of the cell and organelles. Membrane transport systems play very important roles in metal trafficking. This review provides a broad overview of the long distance and cellular transport as well as detoxification and homeostasis mechanisms of Mn and Cu, which are essential micronutrients but...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Copper; Heavy metals; Manganese; Phytoremediation; Transport.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202005000100009

Chemical and physical characterization of Opuntia spp. seeds grown in Hidalgo State, Mexico
Provedor de dados: 118
Autores: Prieto-García,Francisco; Prieto Méndez,Judith; Acevedo Sandoval,Otilio A; Canales Flores,Roberto A; Marmolejo Santillán,Yolanda.
Nopal fruits (Opuntia spp.) represent a valuable food in various Latin America countries. Typically, the seeds are discarded. However, they could contain basic components that might enable their use as a nutritional supplement or as another product convenient for the food industry. The objective of this paper was to perform a physical and chemical characterization of the seeds of three species of Opuntia (O. Heliabravoana, O. Xoconostle, and O. ficus-indica) to provide data that will help determine their potential use. Fruits were collected in different municipalities of Hidalgo State, Mexico; its seeds were extracted, dried, and analyzed. The results reveal that, except for small differences, the seeds had similarity in the physical characteristics of...
Tipo: Journal article
Palavras-chave: Cactaceae; Electron microscope; Heavy metals; Particle size; Prickly pear; Proximal analysis.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202016000100013

Pb and Cd on growth, leaf ultrastructure and essential oil yield mint (Mentha arvensis L.)
Provedor de dados: 65
Autores: Jezler,Caroline Nery; Mangabeira,Pedro Antônio Oliveira; Almeida,Alex-Alan Furtado de; Jesus,Raildo Mota de; Oliveira,Rosilene Aparecida de; Silva,Delmira da Costa; Costa,Larissa Correa do Bomfim.
Contamination of medicinal plants with heavy metals as Pb and Cd can affect the growth and the essential oil production of the plants and represent a risk to those who consume as medicine. This study aimed to evaluate the effects of absorption and localization of Pb and Cd on growth, ultrastructural aspects of leaves and essential oil yield and composition of Mentha arvensis, applied on the soil with increasing concentrations (8, 16, 32, 64 and 128mg kg-1). There was a differential absorption of Pb and Cd by M. arvensis mainly concentrated in the roots. Pb was found in small amounts in the leaves while Cd largely exceeded the safety limit without symptoms of toxicity. The ultrastructural analysis revealed the metal accumulation on vesicles surrounding the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Contamination; Heavy metals; Medicinal plant; Menthol.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782015000300392

Contribution of organic bulking materials on chemical quality of sewage sludge vermicompost
Provedor de dados: 64
Autores: Hashemimajd,Kazem; Jamaati-e-Somarin,Shahzad.
Vermicomposting is at suitable methods for stabilization and converting of sewage sludge into useful products. To investigate the effects of bulking material on vermicompost quality, an experiment was conducted in a factorial design with three replications. In this experiment, the final dried sludge in lagoons was mixed with bulking materials (woodchips, three leaves, and wheat straw) in four mixing proportion with swage sludge (0, 15, 30 and 45%, V/V). Chemical properties of bulking materials, sewage sludge, and produced vermicomposts were determined. Vermicomposts had relatively low pH and electrical conductivity (EC). The nutrients content of vermicompost, especially N, P, Fe, and Zn, were high. These properties showed its suitable quality for use in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vermicompost; Sewage sludge; Bulking materials; Heavy metals; Eisenia foetid.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542011000600006

COMPOSITION, HOT-WATER SOLUBILITY OF ELEMENTS AND NUTRITIONAL VALUE OF FRUITS AND
Provedor de dados: 64
Autores: Barbosa,Julierme Zimmer; Zambon,Leandro Moraes; Motta,Antonio Carlos Vargas; Wendling,Ivar.
ABSTRACT Yerba mate leaves are the most studied and used parts of the tree, while fruits have been little investigated as to their elemental composition. The objective of this study was to characterize the composition, the hot-water solubility of the elements and the nutritional value of yerba mate (Ilex paraguariensis St. Hill) fruits and leaves. Both fruits and leaves were collected from four yerba mate provenances (cities of Cascavel, Quedas do Iguaçu and Ivaí in Paraná state and Barão de Cotegipe in Rio Grande do Sul state) 17 years of age, grown in the city of Pinhais, Paraná state, Brazil. The total and hot water-soluble contents of 22 and 20 elements, respectively, were determined. The elemental composition of the fruits presented the following...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ionome; Heavy metals; Medicinal plants.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542015000600593

Nutritional status and physiological parameters of maize cultivated with sewage sludge
Provedor de dados: 64
Autores: Moreira,Rodrigo Santos; Lense,Guilherme Henrique Expedito; Fávero,Leonardo Ferreira; Oliveira Junior,Benedito Majela de; Mincato,Ronaldo Luiz.
ABSTRACT The use of sewage sludge as a source of nutrients and organic matter for agricultural soils is a well-established practice. However, few reports highlight the effect of the nutrients and potentially toxic elements provided by organic wastes application on the plant physiological parameters, such as photosynthetic activity and stomatal conductivity. We performed a greenhouse experiment with maize exposed to a dystrophic red Latosol amended with mineral fertilizer and different rates of sewage sludge with the following objectives: i) assess the nutrients and metal uptake translocation and distribution in plants and ii) evaluate the relationship between plant physiological parameters and yield indicators under the study conditions. The application of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biosolids; Zea mays; Agricultural production; Heavy metals.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542020000100203