Distribution of Heavy Metals in Marine Sediments of Palermo Gulf (Sicily, Italy)
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Concentrations of Cr, Cu, Hg, Pb and Zn have been measured, by atomic absorption spectrophotometry, in the fine fraction (<63 μm) of surface sediments collected in 30 sites in the Palermo Gulf (Sicily, Italy) in order to assess the levels and the spatial distribution of these elements. Enrichment factors calculated with respect to clean areas have been considered to discriminate between levels due to background or to pollution contributions. The sampling stations, which form a grid inside these areas, are characterized by geographic proximity and by the presence of pollution sources. Ratio matching technique along with hierarchical clustering, minimum spanning tree and principal component analysis have been used for the statistical analysis of data, allowing to better describe the spatial distribution of metal levels. Our work allowed to assess the anthropogenic contribution to the pollution of the area under investigation through industrial and domestic wastes, presence of an harbour area and river inflow.
KeywordsMarine sediments Heavy metals Enrichment factors Ratio matching Hierarchical analysis Marine pollution Sicilian coast
This research has been supported by ARPA Sicilia, Italy, under project DDG 229/2002. Technical support for sample collection by Mario Badami is gratefully acknowledged. We also thank Clare Hampton for her help in revising the manuscript.
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