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| Registros recuperados: 198 | |
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| 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 |
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| 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 |
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| 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 < 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 <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 |
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| 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 |
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| 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 <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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| Registros recuperados: 198 | |
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