2008•Marine Environmental ScienceRequires access

Speciation characteristics and potential ecological risk of heavy metals in surface sediments of Jinzhou Bay

Deng Baoshan

Abstract

The speciation distribution and bioavailability of 6 metals in 14 sediment samples from Jinzhou Bay were analyzed by a sequential extraction procedure.The results showed that Cd was predominantly found in the exchangeable and carbonate phase.Pb and Zn were mainly associated with carbonate and Fe-Mn oxidation phase.Cu was higher in organic phase,and Cr and Ni were mainly associated with residual phase.Hakanson's potential risk index method is improved by the considering heavy metals biological toxicity.The results were good agreement with the assessment of RSP method.The potential ecological risk of Cd,Zn,Pb and Cu was rather high around the southwest of this bay.The order of pollution contents and ecological risk followed by CdZnCuPb.The Jinzhou Bay was divided into four areas according to the degree of ecological risk,which is gradually decreased from Southwest to Northeast.

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Key concepts: Bay, Genetic algorithm, Environmental chemistry, Sediment, Carbonate, Environmental science, Pollution, Heavy metals