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1 July 2005 Concentration and Bioavailability of Heavy Metals in Sediments from Niterói Harbour (Guanabara Bay/S.E. Brazil)
José Antônio Baptista Neto, Mirian Crapez, John J. McAlister, Claudia Gutterres Vilela
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Abstract

The coastal area of Niterói is marked by intensive naval activities and holds one of the countries main naval estates. The harbour and dockyards have been sited in the international literature as potential sources and sinks for accumulation of heavy metals and hence contaminated sediments. The aim of this paper is to assess the concentrations of heavy metals in Niterói Harbour and verify their bioavailability by determining the catalytic effects of the bacteria using esterase activity (EST) and electron transport system activity (ETSA). Samples were analysed for Ni, Zn, Pb, Cr and Cu and normalisation procedures were used to assess whether their concentrations represent background or contamination of the sediment. Heavy metal concentrations, especially for Cu, Zn and Pb were found to be much higher than natural background levels and the index of “geoaccumulation” shows moderate to extreme contamination. However, the absence of the inhibition of dehydrogenase activity indicated that the analysed heavy metals are not bioavailable in the EC50 values.

José Antônio Baptista Neto, Mirian Crapez, John J. McAlister, and Claudia Gutterres Vilela "Concentration and Bioavailability of Heavy Metals in Sediments from Niterói Harbour (Guanabara Bay/S.E. Brazil)," Journal of Coastal Research 2005(214), 811-817, (1 July 2005). https://doi.org/10.2112/012-NIS.1
Received: 8 March 2004; Accepted: 8 March 2004; Published: 1 July 2005
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bacteria
bioavailability
heavy metals
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