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Title: Acumulação de metais-traço em sedimentos de áreas adjacentes ao Porto de Niterói (enseada de São Lourenço, Baía de Guanabara, RJ.)
Keywords: Contaminação;  Sedimentos costeiros;  Fatores de enriquecimento;  Inventários;  Critérios de qualidade de sedimento;  Contamination;  Coastal sediments;  Enrichment factors;  Inventories;  Sediment quality criteria
Issue Date: 3-Mar-2009
Abstract: The whole São Lourenço harbour area is located in the southeast of Guanabara Bay (RJ Brazil). Furthermore, it also houses Porto de Niterói (Niterói Harbour), which is the only cargo harbour in Niterói and other several shipyards. Apart from receiving domestic sewage discharges and possibly other unknown contribution sources from the Bay s surrounding area, the Bay is contaminated by trace metals. This study shows the results of an accumulation evaluation as follows: Cd, Cr, Cu, Ni, Pb and Zn in short cores collected from three different sample stations in that harbour. Possible correlations involving indicating parameters of geochemichal processes such as granulometry, Total Carbon Concentrations (TOC), total sulphur (S), iron (Fe) and manganese (Mg) were evaluated. Enrichment factors (EFs) in relation to background and inventories (metal storage per sediment area) were calculated, and a comparison with international sediment quality values adopted by a local jurisdiction (Resolução CONAMA 344/2004) was conducted. The inventories which always showed the highest accumulation were collected from PN3 Station and the EF showed different trends among the stations. Both the inventories and the EF presented high levels of Cu, Pb and Zn contamination. On the other hand, Ni and Cr concentrations did not reach worrying levels. Higher concentrations of Cr, Cu, Pb and Zn were found at the station which was located at the external part of the harbour. There, Cd, Cr, Cu, Pb and Zn concentrations presented a correlation with Fe. At the station located at the internal area of the harbor, Pb had a correlation with Mn. TOC and S did not seem to affect directly trace metal distribution, but they were used as a marine influence gradient indicator to sediment quality, which affects biogeochemical processes that retain metals. The concentration comparison of Cd, Cr, Cu, Ni, Pb and Zn levels with international sediment quality criteria adopted by the Brazilian jurisdiction (Resolução CONAMA 344/2004) showed that Zn, Cu and Pb concentrations generate environmental concerns related to human activities, such as the management of dredged sediment, if such sediment dredging occurs in the studied areas.
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