Elemental composition of sediment cores from a mangrove environment using neutron activation analysis |
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| Authors: | Julio Cesar Wasserman Ana Maria G Figueiredo Fabio Pellegatti Emmanoel V Silva-Filho |
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| Institution: | a Depto. de Geoquı́mica, UFF, Outeiro de São João Batista, s/no. Centro, CEP 24020-150, Niterói, RJ, Brazil;b Instituto de Pesquisas Energéticas e Nucleares — IPEN-CNEN/SP, Caixa Postal 11049, CEP 05422-970, São Paulo, SP, Brazil |
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| Abstract: | The geochemistry of Sepetiba Bay was studied in four sediment cores using a multi-element approach. Two cores were sampled in the more contaminated eastern part of the bay and two cores were sampled in the western region. The aim was to determine whether less common elements like the rare earths or the actinides are associated with contaminant metals like zinc in the Bay. Samples were analysed by instrumental neutron activation analysis that permits the quantification of total concentrations of metals (Ba, Co, Cr, Cs, Fe, Hf, Rb, Sc, Zn), rare earth elements (Ce, Eu, La, Lu, Sm and Yb), actinides (Th, U), non-metals and semi-metals (As, Br). Organic carbon and total sulphur were also analysed. The results show very strong zinc contamination in the top layers (more than 1000 μg g−1) and background concentrations in the bottom (15 μg g−1). Elements like chromium which would be expected to be released by the heavy industries of Sepetiba Bay, did not show a contamination profile, and concentrations remained close to those of natural environments. No evidence of any association between the zinc and other potential contaminant elements could be identified in this work. |
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| Keywords: | Sediment profiles Multi-element approach Geochemistry Instrumental neutron activation analyses Tropics Sepetiba Bay |
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