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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
21/11/2000 |
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Data da última atualização: |
31/03/2017 |
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Autoria: |
RODRIGUES FILHO, S.; MADDOCK, J. E. L. |
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Afiliação: |
CETEM/CNPq. Centro de Tecnologia Mineral (Rio de Janeiro, RJ); Universidade Federal Fluminense. Departamento de Geoquimica. Instituto de Quimica (Niteroi, RJ). |
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Título: |
Mercury pollution in two gold mining areas of the Brazilian Amazon. |
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Ano de publicação: |
1997 |
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Fonte/Imprenta: |
Journal of Geochemical Exploration, v.58, p.231-240, 1997. |
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Idioma: |
Inglês |
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Conteúdo: |
Gold has been exploited intensively in the Brazilian Amazon during the past fifteen years using garimpo methods (small-scale gold mining). In this study, two gold mining areas were investigated, the municipalities of Pocone and Alta Floresta located in the state of Mato Grosso, Central Brazil. The elemental mercury (Hg) used in amalgamating the gold, the final stage of the ore dressing process, has caused abnormal Hg concentrations in waterways. This has occurred principally in the Amazon region, where most of the ore prospected is alluvial. Background levels of metals were determined by analyzing sediments and soils located upstream of the anthropogenic inputs and unaffected by mining activities. The study aimed to evaluate the pollution level in sediments and soils, taking into account drainage waters directly affected by gold mining. Geoaccumulation indexes (Igeo) of Hg in sediments from both study areas were used to assesses the pollution level in the aquatic environment. The geoaccumulation indexes of Hg in sediments of the Bento Gomes River in Pocone indicate a relatively high degree of pollution at some sites, even reaching class 4 (1.8 mg/kg). However, when the river reaches the Pantanal swamps, Hg concentrations drog considerably to 0.30 mg/kg. This drop seems to be due to accumulation of metals in the sediments of a lake (sampling site PG-24), which retains most of the sediments transported by the Bento Gomes River. Accumulation of metals in the lake also occurred for Cu, Pb, Zn, Fe and Mn. In the region of Alta Floresta, total Hg concentrations in sediments of the Teles Pires River were studied in the grain size fractions < 74 um and > 74 um. Hg concentrations in bottom sediments of this river were higher than those found in the Pocone region, with increases of 1.5 to 30 times the background, and thus reaching an Igeo up to class 5. MenosGold has been exploited intensively in the Brazilian Amazon during the past fifteen years using garimpo methods (small-scale gold mining). In this study, two gold mining areas were investigated, the municipalities of Pocone and Alta Floresta located in the state of Mato Grosso, Central Brazil. The elemental mercury (Hg) used in amalgamating the gold, the final stage of the ore dressing process, has caused abnormal Hg concentrations in waterways. This has occurred principally in the Amazon region, where most of the ore prospected is alluvial. Background levels of metals were determined by analyzing sediments and soils located upstream of the anthropogenic inputs and unaffected by mining activities. The study aimed to evaluate the pollution level in sediments and soils, taking into account drainage waters directly affected by gold mining. Geoaccumulation indexes (Igeo) of Hg in sediments from both study areas were used to assesses the pollution level in the aquatic environment. The geoaccumulation indexes of Hg in sediments of the Bento Gomes River in Pocone indicate a relatively high degree of pollution at some sites, even reaching class 4 (1.8 mg/kg). However, when the river reaches the Pantanal swamps, Hg concentrations drog considerably to 0.30 mg/kg. This drop seems to be due to accumulation of metals in the sediments of a lake (sampling site PG-24), which retains most of the sediments transported by the Bento Gomes River. Accumulation of metals in the lake also occurred ... Mostrar Tudo |
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Palavras-Chave: |
Amazon; Brasil; Gold mining; Mercury pollution; Mina; Ouro; Riverine sediments. |
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Thesagro: |
Mercúrio; Poluição; Sedimento. |
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Thesaurus Nal: |
Amazonia; Brazil. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02580naa a2200277 a 4500
001 1804291
005 2017-03-31
008 1997 bl --- 0-- u #d
100 1 $aRODRIGUES FILHO, S.
245 $aMercury pollution in two gold mining areas of the Brazilian Amazon.
260 $c1997
520 $aGold has been exploited intensively in the Brazilian Amazon during the past fifteen years using garimpo methods (small-scale gold mining). In this study, two gold mining areas were investigated, the municipalities of Pocone and Alta Floresta located in the state of Mato Grosso, Central Brazil. The elemental mercury (Hg) used in amalgamating the gold, the final stage of the ore dressing process, has caused abnormal Hg concentrations in waterways. This has occurred principally in the Amazon region, where most of the ore prospected is alluvial. Background levels of metals were determined by analyzing sediments and soils located upstream of the anthropogenic inputs and unaffected by mining activities. The study aimed to evaluate the pollution level in sediments and soils, taking into account drainage waters directly affected by gold mining. Geoaccumulation indexes (Igeo) of Hg in sediments from both study areas were used to assesses the pollution level in the aquatic environment. The geoaccumulation indexes of Hg in sediments of the Bento Gomes River in Pocone indicate a relatively high degree of pollution at some sites, even reaching class 4 (1.8 mg/kg). However, when the river reaches the Pantanal swamps, Hg concentrations drog considerably to 0.30 mg/kg. This drop seems to be due to accumulation of metals in the sediments of a lake (sampling site PG-24), which retains most of the sediments transported by the Bento Gomes River. Accumulation of metals in the lake also occurred for Cu, Pb, Zn, Fe and Mn. In the region of Alta Floresta, total Hg concentrations in sediments of the Teles Pires River were studied in the grain size fractions < 74 um and > 74 um. Hg concentrations in bottom sediments of this river were higher than those found in the Pocone region, with increases of 1.5 to 30 times the background, and thus reaching an Igeo up to class 5.
650 $aAmazonia
650 $aBrazil
650 $aMercúrio
650 $aPoluição
650 $aSedimento
653 $aAmazon
653 $aBrasil
653 $aGold mining
653 $aMercury pollution
653 $aMina
653 $aOuro
653 $aRiverine sediments
700 1 $aMADDOCK, J. E. L.
773 $tJournal of Geochemical Exploration$gv.58, p.231-240, 1997.
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Registro original: |
Embrapa Pantanal (CPAP) |
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Registro Completo
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Biblioteca(s): |
Embrapa Semiárido. |
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Data corrente: |
08/01/2007 |
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Data da última atualização: |
07/05/2024 |
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Tipo da produção científica: |
Capítulo em Livro Técnico-Científico |
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Autoria: |
CARVALHO, A. P. de; SANTOS, H. G. dos; GOMES, I. A.; OLIVEIRA, J. B. de; LUMBRERAS, J. F.; ANJOS, L. H. C. dos; COELHO, M. R.; JACOMINE, P. K. T.; FASOLO, P. J.; CUNHA, T. J. F.; OLIVEIRA, V. A. de. |
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Afiliação: |
AMERICO PEREIRA DE CARVALHO, CNPF; HUMBERTO GONCALVES DOS SANTOS, CNPS; IDARE AZEVEDO GOMES, CNPS; JOÃO BERTOLDO DE OLIVEIRA, INSTITUTO AGRONÔMICO DE CAMPINAS; JOSE FRANCISCO LUMBRERAS, CNPS; LÚCIA HELENA CUNHA DOS ANJOS, UNIVERSIDADE FEDERAL RURAL DO RIO DE JANEIRO; MAURICIO RIZZATO COELHO, CNPS; PAULO KLINGER TITO JACOMINE, UNIVERSIDADE FEDERAL RURAL DE PERNAMBUCO; PEDRO JORGE FASOLO, CNPF; TONY JARBAS FERREIRA CUNHA, CPATSA; VIRLEI ÁLVARO DE OLIVEIRA, INSTITUTO BRASILEIRO DE GEOGRAFIA E ESTATÍSTICA. |
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Título: |
Latossolos. |
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Ano de publicação: |
2006 |
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Fonte/Imprenta: |
In: SANTOS, H. G. dos; JACOMINE, P. K. T.; ANJOS, L. H. C. dos; OLIVEIRA, V. A. de; OLIVEIRA, J. B. de; COELHO, M. R.; LUMBRERAS, J. F.; CUNHA, T. J. F. ( Ed.). Sistema brasileiro de classificação de solos. 2. ed. Rio de Janeiro: Embrapa Solos, 2006. |
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Páginas: |
cap. 10, p. 161-175. |
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Idioma: |
Português |
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Conteúdo: |
Classes do 2° nível categórico (subordens); Classes do 3° nível categórico (grandes grupos). |
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Palavras-Chave: |
Classificação; Nível categórico. |
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Thesagro: |
Solo. |
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Thesaurus NAL: |
Soil. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/196850/1/Latossolos.pdf
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Marc: |
LEADER 01065naa a2200301 a 4500
001 1158082
005 2024-05-07
008 2006 bl uuuu u00u1 u #d
100 1 $aCARVALHO, A. P. de
245 $aLatossolos.
260 $c2006
300 $acap. 10, p. 161-175.
520 $aClasses do 2° nível categórico (subordens); Classes do 3° nível categórico (grandes grupos).
650 $aSoil
650 $aSolo
653 $aClassificação
653 $aNível categórico
700 1 $aSANTOS, H. G. dos
700 1 $aGOMES, I. A.
700 1 $aOLIVEIRA, J. B. de
700 1 $aLUMBRERAS, J. F.
700 1 $aANJOS, L. H. C. dos
700 1 $aCOELHO, M. R.
700 1 $aJACOMINE, P. K. T.
700 1 $aFASOLO, P. J.
700 1 $aCUNHA, T. J. F.
700 1 $aOLIVEIRA, V. A. de
773 $tIn: SANTOS, H. G. dos; JACOMINE, P. K. T.; ANJOS, L. H. C. dos; OLIVEIRA, V. A. de; OLIVEIRA, J. B. de; COELHO, M. R.; LUMBRERAS, J. F.; CUNHA, T. J. F. ( Ed.). Sistema brasileiro de classificação de solos. 2. ed. Rio de Janeiro: Embrapa Solos, 2006.
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Embrapa Semiárido (CPATSA) |
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