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

Journal of the Brazilian Chemical Society

Universidade Federal de Minas Gerais, Belo Horizonte, Brazil¹  Windmöller, Cláudia C¹  Moura, Priscila A. S¹  Costa, Letícia M¹  Rezende, Patrícia S¹  Nascentes, Clésia C¹  Durão Jr, Walter A¹ 

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

DOI  :  10.1590/S0103-50532011000500014

学科分类：化学（综合）

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】

Unknown