Estudo da contaminação por mercurio e metais pesados em garimpo de ouro primario : o estudo de caso da região de Pilar de Goias e Guarinos, Goias

AUTOR(ES)
DATA DE PUBLICAÇÃO

1990

RESUMO

The main concepts of mercury water chemistry and the environmental contamination by this metal as a by product of mining of primary gold at "Pilar de Goiás" and "Guarinos" regions, state of Goias. Brazil, are here discussed. The heavy metals of lithogenie origin (Cd, Zn, Cu, As, Pb) liberated into the water by the extraction and processing of gold are also deal t with here. The influence of these metals and their toxicities with respect to background areas free from human contamination have a1so been verified. The mercury contents both in sediment samp1es and in water from streams and from the general drainage system were quantitatively analyzed in samples collected on two field trips. The other metals were analyzed only in samples collected during the first trip. Mercury was found in sediments up to a distance of around 100 m from the point that the contaminated waste was introduced into the drainage basin. The content of mercury dissolved in the water ( 1,85 to 4,45 ng/ml) is independent of its concentration in the sediments. High concentrations of As, were noted in the sediments. The heavy metals in the river sediments are potentially dangerous both to water quality and to water life when eventually liberated through physical-chemical and environmental changes. According to theoretical considerations drawn from the geochemistry of the analyzed elements the main occupational and environmental problem (not studied here) is the liberation mercury vapors during the burning of the Hg-Au pasta

ASSUNTO(S)

metais pesados - contaminação garimpagem - pilar (go) mercurio - contaminação garimpagem - guarinos (go)

ACESSO AO ARTIGO

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