Arsenic and Mercury mobility in brazilian sediments from the São Francisco River Basin

Journal of the Brazilian Chemical Society

Patrícia S Rezende¹  Priscila A. S Moura¹  Walter A Durão Jr¹  Clésia C Nascentes¹  Cláudia C Windmöller¹  Letícia M Costa¹ 

[1] ,Universidade Federal de Minas Gerais ICEx Departamento de QuímicaBelo Horizonte MG ,Brazil

关键词: arsenic;    mercury;    sediment samples;    environmental monitoring;    São Francisco River;   

DOI  :  10.1590/S0103-50532011000500014

来源: SciELO

【 摘 要 】

Sediments have metal accumulation properties, then, an evaluation of their geochemistry cycle is feasible via toxic element determination of these samples. Arsenic and mercury determinations were accomplished in 28 sediment samples from the São Francisco River Basin, Minas Gerais, Brazil. For sample pretreatment were employed a pseudo-total digestion procedure with HCl:HNO3 (3:1 v/v) and a partial extraction procedure with 1 mol L-1 HCl. Arsenic and mercury were analysed by hydride generator atomic absorption spectrometry (HG AAS). Mercury determination was realized in the solid samples by direct mercury analyzer (DMA). It was observed that 46% of the samples presented arsenic concentrations above Brazil's legal limits, and 14% of samples exceeded the established mercury limit. The samples with high mercury content were also analysed by thermodesorption coupled to atomic absorption spectrometry (TDAAS) and only Hg(II) was identified

【 授权许可】

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