Study of heavy metal concentration and partitioning in the Estrela River: implications for the pollution in Guanabara Bay - SE Brazil

Anais da Academia Brasileira de Ciências

Carlos M. A. Rangel²  José A. Baptista Neto²  Estefan M. Fonseca²  John Mcalister¹  Bernard J. Smith¹ 

[1] ,Universidade Federal Fluminense Departamento de Geologia Niterói RJ ,Brasil

关键词: Estrela River;    Guanabara Bay;    heavy metal;    fractionation;    Rio Estrela;    Baía de Guanabara;    metais pesados;    fracionamento;   

DOI  :  10.1590/S0001-37652011005000020

来源: SciELO

【 摘 要 】

In this study, the geochemical analysis of ten sediment samples collected along the fluvial system of the Estrela River, which flows into the northern portion of Guanabara Bay, shows the presence of anthropogenic impacts in this area. Concentrations of Fe, Mn, Zn, Cu, Pb, Cr and Ni obtained were slightly higher, when compared with values found innatural environments. The particle size and organic matter content in most of the analyzed stations showed featuresnot conducive to the accumulation of pollutants due to the low organic matter content and the strong presence ofsand fraction. There was also the fractionation of heavy metals in sediments and it was found the prominence ofresidual and reducible phase, besides the significant occurrence of organic fractions in some analyzed stations. Thesefactors, thus, highlight the potential risks of contamination, where the metals associated with the organic phase canbecome bioavailable in processes of dissolution, provided by physico-chemical changes that can occur in this aquaticenvironment.

【 授权许可】

CC BY   
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