Consulta: subjectFacets:"Trace element"
Registros recuperados: 15
Data/hora: 02/06/2024 15:53:19

MERCURY IN THE SEDIMENT OF PELOTAS RIVER BASIN, BRAZIL
Provedor de dados: 70
Autores: Remor,Marcelo B.; Sampaio,Silvio C.; Model,Kathleen J.; Falco,Thais D.; Prudente,Victor H. R.
ABSTRACT Many studies have determined the concentration of trace elements in river sediments in Brazil. Notwithstanding, mercury assessments are scarce, especially because of exclusive extraction techniques and expensive analysis techniques. Still, this element is known for its toxicity, persistence, and bioaccumulation, making its presence in the environment an important factor for biota and human health. For this reason, the objective of this study was to determine the mercury concentration in the sediment of the Pelotas River basin, located on the border of the states of Santa Catarina and Rio Grande do Sul. The sediment was collected at eight locations of the Pelotas basin and, after drying, the mercury was quantified by atomic absorption spectrometry...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metal; Trace element; Multivariate statistics.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162018000100117

Etrace Express: software for risk analysis of trace elements in inorganic fertilizers - user's manual and reference guide.
Provedor de dados: 14
Autores: MARCHI, G.; GUILHERME, L. R. G.; SILVA, A. B. DA; GONÇALVES, V. C.; PINHO, P. J. DE; PIERANGELI, M. A. P.; DANTAS, O. D.
bitstream/item/77800/1/doc-300.pdf
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Software; Elementos-traço; Contaminação do solo; Fertilizer; Trace element; Soil contamination.; Fertilizante; Segurança Alimentar.; Food security; Risk analysis.
Ano: 2010
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/898281

Etrace Express: manual de programa para análisis de riesgo de elementos traza en fertilizantes inorgánicos.
Provedor de dados: 14
Autores: MARCHI, G.; GUILHERME, L. R. G.; SILVA, A. B. DA; GONÇALVES, V. C.; PINHO, P. J. DE; PIERANGELI, M. A. P.; DANTAS, O. D.; HURTADO, S. M. C.
bitstream/item/77789/1/doc-291.pdf
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Software; Elemento-traço; Contaminação do solo; Fertilizer; Trace element; Soil contamination.; Fertilizante; Segurança Alimentar.; Food security; Risk analysis.
Ano: 2010
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/898139

Variation of heavy metal concentrations (Ag, Cd, Co, Cu, Fe, Pb, V, and Zn) during the life cycle of the common cuttlefish Sepia officinalis
Provedor de dados: 5
Autores: Miramand, Pierre; Bustamante, Paco; Bentley, Daniel; Koueta, Noussithe.
The developmental changes in the concentration of 8 essential and non-essential heavy metals (Ag, Cd, Cu, Co, Fe, Pb, V, Zn) in the tissues (digestive gland, cuttlebone and whole animal) of the common cuttlefish Sepia officinalis collected in the bay of the river Seine were monitored from the end of the embryogenesis until the adult reproductive stage. Compared to embryos, juveniles after hatching displayed much higher concentrations of Ag, Cu, Fe and Zn, suggesting an efficient incorporation from seawater. Conversely, the amounts of Cd, Pb and V in hatchlings remained constant suggesting that these metals are barely bioavailable for juveniles. Once the juveniles start to feed, the digestive gland appears to play a major role in the storage of all metals....
Tipo: Text
Palavras-chave: Embryogenesis; Sexual maturity; Cephalopods; Detoxification; Bioaccumulation; Trace element.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-2330.pdf

Hydrological and biogeochemical dynamics of the minor and trace elements in the St. Lawrence River
Provedor de dados: 5
Autores: Rondeau, B; Cossa, Daniel; Gagnon, P; Pham, T; Surette, C.
Surface water samples from the St. Lawrence River were collected in order to study the processes controlling minor and trace elements concentrations (Al, Fe, Mn, Cd, Co, Cu, Ni and Zn), and to construct mass balances allowing estimates of the relative importance of their natural and anthropogenic sources. The two major water inputs, the upper St. Lawrence River, which drains waters originating from the Lake Ontario, and the Ottawa River were collected fortnightly over 18 months. In addition, other tributaries were sampled during the spring floods. The output was monitored near Quebec City at the river mouth weekly between 1995 and 1999. Dissolved metal concentrations in the upper St. Lawrence River carbonated waters were lower than in the acidic waters of...
Tipo: Text
Palavras-chave: St. Lawrence; Mass balance; River; Biogeochemistry; Trace element.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-1357.pdf

Significance of metallothioneins in differential cadmium accumulation kinetics between two marine fish species
Provedor de dados: 5
Autores: Le Croizier, Gael; Lacroix, Camille; Artigaud, Sebastien; Le Floch, Stephane; Raffray, Jean; Penicaud, Virginie; Coquille, Valerie; Autier, Julien; Rouget, Marie-laure; Le Bayon, Nicolas; Lae, Raymond; De Morais, Luis Tito.
Impacted marine environments lead to metal accumulation in edible marine fish, ultimately impairing human health. Nevertheless, metal accumulation is highly variable among marine fish species. In addition to ecological features, differences in bioaccumulation can be attributed to species-related physiological processes, which were investigated in two marine fish present in the Canary Current Large Marine Ecosystem (CCLME), where natural and anthropogenic metal exposure occurs. The European sea bass Dicentrarchus labrax and Senegalese sole Solea senegalensis were exposed for two months to two environmentally realistic dietary cadmium (Cd) doses before a depuration period. Organotropism (i.e., Cd repartition between organs) was studied in two storage...
Tipo: Text
Palavras-chave: Metal; Trace element; Dicentrarchus labrax; Solea senegalensis; Chronic dietary exposure.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00437/54810/56480.pdf

Subcellular distribution of Ag, Cd, Co, Cu, Fe, Mn, Ph, and Zn in the digestive gland of the common cuttlefish Sepia officinalis
Provedor de dados: 5
Autores: Bustamante, Paco; Bertrand, M; Boucaud Camou, E; Miramand, Pierre.
The subcellular fractionation of the digestive gland cells of the common cuttlefish Sepia officinalis was performed to investigate the distribution of metals between organelles and cytosol and the different cytosolic fractions separated by gel-filtration chromatography. Total metal concentrations vary over 3 orders of magnitude, ranging from dwt for Pb to dwt for Zn. With the exception of Cd, Co, and Cu, metals were mostly bound to the organelles. Whereas no specific organelle compartment was found for Mn, Ph, and Zn, Fe was mainly associated with nucleus, brown body, and "boule" fraction (i.e., 52%) and 44% of the total Ag was contained in the lysosomal and mitochondria enriched fraction. The link of metals with hydrosoluble proteins in the cytosolic...
Tipo: Text
Palavras-chave: Sepia officinalis; Chromatography; Metallothionein; Detoxification; Trace element; Metal; Cephalopod.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-2532.pdf

An evaluation of Mg/Ca, Sr/Ca, and Ba/Ca ratios as environmental proxies in aragonite bivalve shells
Provedor de dados: 5
Autores: Poulain, C.; Gillikin, D. P.; Thebault, Julien; Munaron, Jean-marie; Bohn, M; Robert, Rene; Paulet, Yves-marie; Lorrain, Anne.
The influence of salinity and water chemistry on Mg/Ca, Sr/Ca and Ba/Ca ratios in the aragonitic shells of the Manila clam were investigated. Clams were reared at constant temperature (20 °C) under different controlled conditions of salinity, commonly encountered in their natural habitat. Clams were held in three tanks with a constant salinity of 35 for the first 35 days and then two tanks were changed to lower salinities (20 and 28) for the next 29 days. Individual shell Mg/Ca, Sr/Ca and Ba/Ca ratios were studied through time. Despite stable conditions (temperature, salinity, and Mg/Cawater) for clams reared at salinity 35 during the experiment, Mg/Ca shell ratios increased through the time. Moreover the salinity decrease at t35 slowed the increase of...
Tipo: Text
Palavras-chave: Ruditapes philippinarum; Aragonite; Sclerochronology; Bivalved mollusk; Trace element; Proxy.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00245/35649/34158.pdf

Root biomass production in populations of six rooted macrophytes in response to Cu exposure: Intra-specific variability versus constitutive-like tolerance
Provedor de dados: 5
Autores: Marchand, L.; Nsanganwimana, F.; Lamy, Jean-baptiste; Quintela-sabaris, C.; Gonnelli, C.; Colzi, I.; Fletcher, T.; Oustriere, N.; Kolbas, A.; Kidd, P.; Bordas, F.; Newell, P.; Alvarenga, P.; Deletic, A.; Mench, M.
Intra-specific variability of root biomass production (RP) of six rooted macrophytes, i.e. Juncus effusus, Phragmites australis, Schoenoplectus lacustris, Typha latifolia, Phalaris arundinacea, and Iris pseudacorus grown from clones, in response to Cu exposure was investigated. Root biomass production varied widely for all these macrophytes in control conditions (0.08 μM) according to the sampling site. Root biomass production of T. latifolia and I. pseudacorus in the 2.5–25 μM Cu range depended on the sampling location but not on the Cu dose in the growth medium. For P. australis, J. effusus, S. lacustris, and P. arundinacea, an intra-specific variability of RP depending on both the sampling location and the Cu-dose was evidenced. This intra-specific...
Tipo: Text
Palavras-chave: Copper tolerance; Phytoremediation; Root biomass; Trace element; Wetland.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00201/31183/29869.pdf

Trace element contamination in fish impacted by bauxite red mud disposal in the Cassidaigne canyon (NW French Mediterranean)
Provedor de dados: 5
Autores: Bouchoucha, Marc; Chekri, R.; Leufroy, A.; Jitaru, P.; Millour, S.; Marchond, N.; Chafey, C.; Testu, C.; Zinck, J.; Cresson, Pierre; Mirallès, F.; Mahe, A.; Arnich, N.; Sanaa, M.; Bemrah, N.; Guérin, T.
From 1966 to 2015, the Gardanne alumina refinery discharged some 20 million tons of bauxite residue (called red mud) into the Cassidaigne Canyon (northwest French Mediterranean) with impacts on local ecosystem functioning. Although these red muds contained high levels of trace elements (TE), in particular titanium (Ti), vanadium (V), aluminum (Al) and arsenic (As), surprisingly, their impacts on fish contamination levels and the risk related to fish consumption have been little studied until now. Here, 11 trace elements (Al, As, Cd, Cr, Co, Cr, Mn, Ni, Pb, Ti and V) were analyzed in muscle and, when possible, liver, from 1308 fish of 26 species from an impacted zone in the vicinity of the Cassidaigne Canyon and a reference zone, unaffected by red mud...
Tipo: Text
Palavras-chave: Trace element; Bioaccumulation; Arsenic speciation; ICP-MS; Fish; Industrial discharge.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00505/61618/65529.pdf

Isolating coccoliths from sediment for geochemical analysis
Provedor de dados: 5
Autores: Halloran, Paul R.; Rust, Nigel; Rickaby, Rosalind E. M.
Trace element analysis of open-marine sedimentary carbonates provides a wealth of paleoclimate data. At present, the majority of this data is obtained from foraminifera tests. Complications regarding the variability of conditions experienced by foraminifera throughout test formation and the influence of diagenetic processes on sample chemistry limit the value of foraminifera samples in certain situations. Coccoliths, the calcium carbonate plates produced by coccolithophores, represent a second major pelagic open-marine carbonate source with the potential to provide a wide range of valuable trace element proxy data but which have, until now, been unavailable for analysis of many trace elements because of clay contamination. Here we describe a novel...
Tipo: Text
Palavras-chave: Coccolith; Coccolithophore; Clay; Sorting; Trace element; Geochemistry.
Ano: 2009
URL: https://archimer.ifremer.fr/doc/00220/33080/31542.pdf

Mercury and stable isotopes (δ15N and δ13C) as tracers during the ontogeny of Trichiurus lepturus
Provedor de dados: 83
Autores: Beneditto,Ana Paula Madeira Di; Bittar,Vanessa Trindade; Rezende,Carlos Eduardo de; Camargo,Plínio Barbosa; Kehrig,Helena Amaral.
This study applies total mercury (THg) concentration and stable isotope signature (δ15N and δ13C) to evaluate the trophic status and feeding ground of Trichiurus lepturus during its ontogeny in northern Rio de Janeiro, south-eastern Brazil. The trophic position of T. lepturus is detected well by THg and δ15N as the sub-adult planktivorous specimens are distinct from the adult carnivorous specimens. The δ13C signatures suggest a feeding ground associated with marine coastal waters that are shared by fish in different ontogenetic phases. The diet tracers indicated that the fish feeding habits do not vary along seasons of the year, probably reflecting the prey availability in the study area. This fish has economic importance and the concentration of THg was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carbon; Diet tracers; Nitrogen; Trace element; Trichiurus lepturus.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000100211

Zinc adsorption in highly weathered soils
Provedor de dados: 86
Autores: Casagrande,José Carlos; Soares,Marcio Roberto; Mouta,Ernesto Rinaldi.
The objective of this work was to assess the effects of pH and ionic strength upon zinc adsorption, in three highly weathered variable charge soils. Adsorption isotherms were elaborated from batch adsorption experiments, with increasing Zn concentrations (0-80 mg L-1), and adsorption envelopes were constructed through soil samples reactions with 0.01, 0.1 and 1 mol L-1 Ca(NO3)2 solutions containing 5 mg L-1 of Zn, with an increasing pH value from 3 to 8. Driving force of reaction was quantified by Gibbs free energy and separation factor. Isotherms were C-, H- and L-type and experimental results were fitted to nonlinear Langmuir model. Maximum adsorption ranged from 59-810 mg kg-1, and Zn affinity was greater in subsoil (0.13-0.81 L kg-1) than in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: PH; Adsorption envelope; Adsorption isotherm; Ionic strength; Trace element.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2008000100017

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

HEAVY METALS IN VINEYARDS AND ORCHARD SOILS
Provedor de dados: 94
Autores: BRUNETTO,GUSTAVO; FERREIRA,PAULO ADEMAR AVELAR; MELO,GEORGE WELLINGTON; CERETTA,CARLOS ALBERTO; TOSELLI,MORENO.
ABSTRACT  The application of foliar fungicides in vineyards and orchards can increase soil concentration of heavy metals such as copper (Cu) and zinc (Zn), up to the toxicity threshold for fruit trees and cover crops. However, some agronomic practices, such as liming, addition of organic fertilizers, cultivation of soil cover crops and inoculation of young plants with arbuscular mycorrhizal fungi can decrease the availability and the potential of heavy metal toxicity to fruit trees. This review aims to compile and present information about the effects of increasing concentrations of heavy metals, especially Cu and Zn, on soils cultivated with fruit trees and provides some agronomic practices of remediation. Information about the sources of heavy metals...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trace element; Phytotoxicity; Growth; Fruit trees.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452017000203001