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1 July 2005 Distribution and Geochemical Partitioning of Heavy Metals in Sediments of the Bahía Blanca Estuary, Argentina
Jorge Marcovecchio, Laura Ferrer
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A long-term study programme has evaluated heavy metals in the Bahía Blanca estuary, considering occurrence, concentration and distribution in the estuarine sediments, as well as their corresponding geochemical partitioning in the <62 µm grain size fraction of the sediment. Total concentrations of heavy metals (Cd, Zn, Cu, Cr, Pb, Fe) have been determined through flameless atomic absorption spectrophotometry (AAS). Geochemical partitioning of these metals was determined following a sequential extraction technique. Furthermore, heavy metal distribution was studied against organic matter concentration within the sediments.

The results allow the characterization of the spatial distribution of the metals, together with their accumulation areas and potential sources. Bahía Blanca estuarine sediments have low to medium heavy metal concentrations. The geochemical partitioning indicated that many bioavailable species occur within the system, including those of highly toxic elements such as cadmium. Moreover, a theoretical scheme of transference of these metals to other compartments within the system was proposed. Finally, the environmental status of the estuary was addressed within the described framework.

Jorge Marcovecchio and Laura Ferrer "Distribution and Geochemical Partitioning of Heavy Metals in Sediments of the Bahía Blanca Estuary, Argentina," Journal of Coastal Research 2005(214), 826-834, (1 July 2005).
Received: 8 March 2004; Accepted: 8 March 2004; Published: 1 July 2005

accumulation processes
anthropic sources
estuarine sediments
heavy metals
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