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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
13/08/1998 |
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Data da última atualização: |
28/03/2017 |
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Autoria: |
MALM, O.; GUIMARAES, J. R. D.; CASTRO, M. B.; BASTOS, W. R.; VIANA, J. P.; BRANCHES, F. J. P.; SILVEIRA, E. G.; PFEIFFER, W. C. |
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Título: |
Follow-up of mercury levels in fish, human hair and urine in the Madeira and Tapajos basins, Amazon, Brazil. |
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Ano de publicação: |
1997 |
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Fonte/Imprenta: |
Water, Air and Soil Pollution, v.97, n.1/2, p.45-51, 1997. |
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Idioma: |
Inglês |
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Conteúdo: |
Informal economy of gold mining has contamined some importyant river basins in Amazon. Follow-up studies on critical compartments showed some areas with Hg levels in fish as well as in human hair samples. Average Hg in piscivorous fish in the Madeira river itself was 846 ppb (N=284) with a maximum of 3921 ppb. Mercury in fish from non polluted areas in this basin shows high variability, even for single species. A seasonal variation in Hg content was observed, with higher values at the end of the dry season. In the upper Tapajos basin comparable values were found for fish but with a definite decreasing trend downstream. Average value for piscivorous fish in the whole Tapajos basin is 482 ppb (N=122) with a maximum value of 3770 ppb. Hair Hg was higher in fishing villages in the Tapajos (average: 17 ppm; with N=432 and maximum value of 176 ppm) than in the Madeira (average: 9 ppm; N=169; maximum 71 ppm) and data from some areas of the Tapajos suggest a decrease with time. Mercury was much higher in urine of goldshop workers in Santarem (low Tapajos) than in Alta Floresta (high Tapajos) and show a decreasing trend in both cases, probably related to the significant decline in gold mining activities during the study period (1986-1994). |
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Palavras-Chave: |
Amazon river basin; Bacia Amazonica; Brasil. |
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Thesagro: |
Meio Ambiente; Mercúrio; Peixe; Poluição. |
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Thesaurus Nal: |
Brazil; environment; fish; mercury; pollution. |
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Categoria do assunto: |
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Marc: |
LEADER 02176naa a2200349 a 4500
001 1792814
005 2017-03-28
008 1997 bl --- 0-- u #d
100 1 $aMALM, O.
245 $aFollow-up of mercury levels in fish, human hair and urine in the Madeira and Tapajos basins, Amazon, Brazil.
260 $c1997
520 $aInformal economy of gold mining has contamined some importyant river basins in Amazon. Follow-up studies on critical compartments showed some areas with Hg levels in fish as well as in human hair samples. Average Hg in piscivorous fish in the Madeira river itself was 846 ppb (N=284) with a maximum of 3921 ppb. Mercury in fish from non polluted areas in this basin shows high variability, even for single species. A seasonal variation in Hg content was observed, with higher values at the end of the dry season. In the upper Tapajos basin comparable values were found for fish but with a definite decreasing trend downstream. Average value for piscivorous fish in the whole Tapajos basin is 482 ppb (N=122) with a maximum value of 3770 ppb. Hair Hg was higher in fishing villages in the Tapajos (average: 17 ppm; with N=432 and maximum value of 176 ppm) than in the Madeira (average: 9 ppm; N=169; maximum 71 ppm) and data from some areas of the Tapajos suggest a decrease with time. Mercury was much higher in urine of goldshop workers in Santarem (low Tapajos) than in Alta Floresta (high Tapajos) and show a decreasing trend in both cases, probably related to the significant decline in gold mining activities during the study period (1986-1994).
650 $aBrazil
650 $aenvironment
650 $afish
650 $amercury
650 $apollution
650 $aMeio Ambiente
650 $aMercúrio
650 $aPeixe
650 $aPoluição
653 $aAmazon river basin
653 $aBacia Amazonica
653 $aBrasil
700 1 $aGUIMARAES, J. R. D.
700 1 $aCASTRO, M. B.
700 1 $aBASTOS, W. R.
700 1 $aVIANA, J. P.
700 1 $aBRANCHES, F. J. P.
700 1 $aSILVEIRA, E. G.
700 1 $aPFEIFFER, W. C.
773 $tWater, Air and Soil Pollution$gv.97, n.1/2, p.45-51, 1997.
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Embrapa Pantanal (CPAP) |
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