Arsenic and Mercury Mobility in Brazilian Sediments from the Sao Francisco River Basin

作者：Rezende Patricia S; Moura Priscila A S; Durao Walter A Jr; Nascentes Clesia C; Windmoeller Claudia C; Costa Leticia M^*

来源：Journal of the Brazilian Chemical Society, 2011, 22(5): 910-U135.

DOI：10.1590/S0103-50532011000500014

• arsenic
• mercury
• sediment samples
• environmental monitoring
• Sao Francisco River

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 Sao Francisco River Basin, Minas Gerais, Brazil. For sample pretreatment were employed a pseudo-total digestion procedure with HCl:HNO(3) (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.

• 出版日期2011-5