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

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

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 sli...

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Bibliographic Details
Published in:Anais da Academia Brasileira de Ciências Vol. 83; no. 3; pp. 801 - 816
Main Authors: Rangel, Carlos M A, Neto, José A Baptista, Fonseca, Estefan M, McAlister, John, Smith, Bernard J
Format: Journal Article
Language:English
Portuguese
Published: Brazil Academia Brasileira de Ciências 01-09-2011
Subjects:
Baía de Guanabara
Brackish
Brazil
Chromium
Environmental Monitoring - methods
Estrela River
fracionamento
fractionation
Geologic Sediments - chemistry
Guanabara Bay
heavy metal
Heavy metals
metais pesados
Metals, Heavy - analysis
MULTIDISCIPLINARY SCIENCES
Partitioning
Rio Estrela
Risk
Rivers
Rivers - chemistry
Sediments
Stations
Water Pollutants, Chemical - analysis
Brazil
ASW, Brazil
ASW, Brazil, Rio de Janeiro, Guanabara Bay
fractionation
Baía de Guanabara
Rio Estrela
Estrela River
Guanabara Bay
heavy metal
metais pesados
fracionamento
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Summary: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 in natural environments. The particle size and organic matter content in most of the analyzed stations showed features not conducive to the accumulation of pollutants due to the low organic matter content and the strong presence of sand fraction. There was also the fractionation of heavy metals in sediments and it was found the prominence of residual and reducible phase, besides the significant occurrence of organic fractions in some analyzed stations. These factors, thus, highlight the potential risks of contamination, where the metals associated with the organic phase can become bioavailable in processes of dissolution, provided by physico-chemical changes that can occur in this aquatic environment.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
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content type line 23
ISSN:0001-3765
1678-2690
1678-2690
DOI:10.1590/S0001-37652011005000020