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Evaluation of trace metal levels in surface sediments of the Sergipe River Hydrographic Basin, Northeast Brazil

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      Abstract

      The distributions of Co, Cr, Cu, Mn, Ni, Pb, Fe and Al were investigated in surface sediments collected at 19 sites in the Sergipe River Hydrographic Basin of Northeast Brazil. A regional geochemical baseline (RGB) was defined using iron as a reference element. Enrichment factors (EF) and geoaccumulation indices (Igeo) were used to determine the extent of anthropogenic metal pollution. EF values showed that sediments from sites 1, 5 and 13 could be considered contaminated by Pb, Cr and Cu, respectively. Igeo values showed that only site 13 could be considered contaminated. For other sites, results indicated that naturally occurring metals predominated in the sediments. Possible toxicity related to these metals was examined using the comparing sediment chemical data with sediment quality guidelines (SQG) PEC-TEC values. Principal component analysis (PCA) clearly separated the sites into two groups and hierarchical cluster analysis (HCA) confirmed the interpretations made from the PCA results.

      Translated abstract

      As distribuições de Co, Cr, Cu, Mn, Ni, Pb, Fe e Al foram investigadas em sedimentos superficiais coletados em 19 sítios da Bacia Hidrográfica do Rio Sergipe, Nordeste do Brasil. Foi definida uma base geoquímica para a região (RGB) usando o ferro como elemento de referência. Fatores de enriquecimento (EF) e índice de geoacumulação (Igeo) foram empregados para determinar a contribuição por origem antropogênica. Valores de EF mostraram que os sedimentos dos sítios 1, 5 e 13 podem ser considerados contaminados por Pb, Cr e Cu, respectivamente. Valores de Igeo mostraram que o sítio 13 pode ser considerado contaminado. Há uma grande predominância nos sedimentos de metais de origem natural. A possível toxicidade foi avaliada comparando com os valores PEC-TEC dos guias de qualidade de sedimentos (SQG). Análise de componentes principais (PCA) separou claramente os pontos em dois grupos e a análise de agrupamento hierárquico (HCA) confirmou as interpretações feitas pela PCA.

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      Most cited references 51

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         RB Clark,  B. Clark,  R Clark (1997)
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            Author and article information

            Affiliations
            [1] Universidade Federal de Sergipe Brazil
            [2] Instituto Tecnológico e de Pesquisa do Estado de Sergipe Brazil
            Contributors
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            Journal
            jbchs
            Journal of the Brazilian Chemical Society
            J. Braz. Chem. Soc.
            Sociedade Brasileira de Química (São Paulo)
            1678-4790
            September 2012
            : 23
            : 9
            : 1669-1679
            S0103-50532012000900012

            http://creativecommons.org/licenses/by/4.0/

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            Product Information: SciELO Brazil
            Categories
            CHEMISTRY, MULTIDISCIPLINARY
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