Your browser doesn't support javascript.
loading
Hydrogeochemistry of arsenic pollution in watersheds influenced by gold mining activities in Paracatu (Minas Gerais State, Brazil).
Bidone, Edison; Castilhos, Zuleica; Cesar, Ricardo; Santos, Maria Carla; Sierpe, Ricardo; Ferreira, Marcos.
Afiliação
  • Bidone E; Department of Environmental Geochemistry, Fluminense Federal University, UFF, Outeiro São João Batista, s/n. Centro, Niterói, RJ, Brazil. ebidone@yahoo.com.br.
  • Castilhos Z; Department of Environmental Geochemistry, Fluminense Federal University, UFF, Outeiro São João Batista, s/n. Centro, Niterói, RJ, Brazil.
  • Cesar R; Center for Mineral Technology, CETEM/MCTI, Cidade Universitária, Av. Pedro Calmon, 900, Rio de Janeiro, RJ, Brazil.
  • Santos MC; Department of Geography, Federal University of Rio de Janeiro, UFRJ, Av. Athos da Silveira Ramos, 274-Cidade Universitária, Rio de Janeiro, RJ, Brazil.
  • Sierpe R; Department of Environmental Geochemistry, Fluminense Federal University, UFF, Outeiro São João Batista, s/n. Centro, Niterói, RJ, Brazil.
  • Ferreira M; Department of Environmental Geochemistry, Fluminense Federal University, UFF, Outeiro São João Batista, s/n. Centro, Niterói, RJ, Brazil.
Environ Sci Pollut Res Int ; 23(9): 8546-55, 2016 May.
Article em En | MEDLINE | ID: mdl-26797944
The aim of this study is to evaluate total arsenic (As) concentrations in drinking water (main pathway of human exposure) and its hydrogeochemical controls in the "Morro do Ouro" gold mine region, which is the largest gold mine in Brazil, characterized by gold-arsenopyrite association. Arsenic concentration was generally below the detection limit (LOD < 0.5 µg L(-1)). Thus, water ingestion may not be a significant exposure pathway to local population. Low groundwater As concentrations (<1 µg L(-1)) are likely due to ore body structural setting, which plunges from 10° to >20°, being readily covered by thick phyllites that are poor in As some hundreds of meters away from the mine. Thirty-five percent of As levels in superficial waters (<0.5 to 40 µg L(-1)) were >10 µg L(-1), which is the maximum permissible value for human ingestion. The highest concentrations were found nearby mine facilities and old artisanal mining areas surrounding the mine, decreasing downstream. Undisturbed watersheds showed As concentrations close to LOD. Hydrogeochemical data stress the sorption (adsorption and co-precipitation) of As role, mainly by Fe oxyhydroxides, as a geochemical filter that retains As, attenuating its concentration in both superficial and groundwater. Such minerals are abundant in the region oxisols, sediments, and phyllites and may form stable mineral complexes with As under the pH (mostly neutral) and Eh (reduced environment) conditions found in the field. It has been demonstrated that As(III) (more toxic) and As(V) co-exist in the analyzed waters and that As(V) predominates in superficial water.
Assuntos
Palavras-chave
Texto completo
Adicionar na Minha BVS
Imprimir
XML
PubMed Links
Buscar no Google

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Arsênio / Poluentes Químicos da Água / Poluição Química da Água / Monitoramento Ambiental / Mineração Limite: Humans País/Região como assunto: America do sul / Brasil Idioma: En Revista: Environ Sci Pollut Res Int Assunto da revista: SAUDE AMBIENTAL / TOXICOLOGIA Ano de publicação: 2016 Tipo de documento: Article País de afiliação: Brasil País de publicação: Alemanha
Texto completo
Adicionar na Minha BVS
Imprimir
XML
PubMed Links
Buscar no Google

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Arsênio / Poluentes Químicos da Água / Poluição Química da Água / Monitoramento Ambiental / Mineração Limite: Humans País/Região como assunto: America do sul / Brasil Idioma: En Revista: Environ Sci Pollut Res Int Assunto da revista: SAUDE AMBIENTAL / TOXICOLOGIA Ano de publicação: 2016 Tipo de documento: Article País de afiliação: Brasil País de publicação: Alemanha