Distribution, fractional and mobility of trace elements in stream sediments

Química Nova

Pacheco-Silva, Érica¹  Universidade Federal de Ouro Preto, Ouro Preto, Brasil¹  Nalini Júnior, Hermínio Arias¹  Guimarães-Silva, Aline Kelly¹  Lena, Jorge Carvalho de¹  Centro Federal de Educação Tecnológica de Minas Gerais, Belo Horizonte, Brasil¹  Pereira, Janice Cardoso¹ 

关键词: sediments;    trace elements;    fractionation.;   

DOI  :  10.1590/S0100-40422007000500037

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

The gold and iron mining activities in the Velhas River yield considerable amounts of suspended solids as well as metals to the hydrological system of the region. The risks were assessed by sequential extraction procedures. They were carried out in sediment samples, aiming to evaluate the presence of Co, Cr, Cu, Ni, Zn and As. Although being at high levels in some parts of the river (e.g. As 527 mg g-1 and Cr 475 mg g-1) they are associated with the residual fraction. Mobility factors were also calculated and show that these species are enriched along the river, e.g. for As 0.02 at the spring and 0.33 at the high course of the river.

【 授权许可】

Unknown