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Effect of chloride on heavy metal mobility of harbour sediments

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Abstract

To evaluate the environmental impact of polluted sediments, several operationally defined sequential extraction procedures (SEPs) have been described. Salinity has long been recognised as an important variable determining the physicochemical behaviour of heavy metals in marine sediments. Thus, in the present paper, the modified BCR-SEP has been applied to harbour sediments in order to assess to what extent trace metal mobility (Cd, Cr, Cu, Ni, Pb and Zn) could be influenced by chloride content in sediments. For this, washed (W) and non-washed (NW) sediments were compared. The relative mobility order observed for the six trace metals studied was not seen to be influenced by the presence of chloride in the sediments, but an increase of mobility was observed for Cd and Zn (the most mobile metals) when chloride was present in the sediments. Characterisation of the sediments and of the pseudo-total metal contents by means of an aqua regia extraction was also assessed.

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Acknowledgements

The authors thank the DGICYT under project BQU2003-02951 for the financial help received in support of this study. A. Guevara-Riba thanks the Universitat de Barcelona for a PhD training Grant in Research and Teaching and A. Sahuquillo thanks MCYT for financial support. The authors would also like to express their gratitude to the Environmental Department of Barcelona Harbour Authority for the facilities used in the sampling of harbour sediments.

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Correspondence to A. Sahuquillo.

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Guevara-Riba, A., Sahuquillo, A., Rubio, R. et al. Effect of chloride on heavy metal mobility of harbour sediments. Anal Bioanal Chem 382, 353–359 (2005). https://doi.org/10.1007/s00216-005-3103-x

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  • DOI: https://doi.org/10.1007/s00216-005-3103-x

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