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The Scientific World Journal
Volume 2012, Article ID 125608, 11 pages
http://dx.doi.org/10.1100/2012/125608
Research Article

Chemical Speciation and Potential Mobility of Heavy Metals in the Soil of Former Tin Mining Catchment

1Department of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia
2Department of Geology, University of Malaya, 50603 Kuala Lumpur, Malaysia

Received 22 October 2011; Accepted 14 December 2011

Academic Editor: María Carmen Yebra-Biurrun

Copyright © 2012 M. A. Ashraf et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This study describes the chemical speciation of Pb, Zn, Cu, Cr, As, and Sn in soil of former tin mining catchment. Total five sites were selected for sampling and subsequent subsamples were collected from each site in order to create a composite sample for analysis. Samples were analysed by the sequential extraction procedure using optical emission spectrometry (ICP OES). Small amounts of Cu, Cr, and As retrieved from the exchangeable phase, the ready available for biogeochemical cycles in the ecosystem. Low quantities of Cu and As could be taken up by plants in these kind of acidic soils. Zn not detected in the bioavailable forms while Pb is only present in negligible amounts in very few samples. The absence of mobile forms of Pb eliminates the toxic risk both in the trophic chain and its migration downwards the soil profile. The results also indicate that most of the metals have high abundance in residual fraction indicating lithogenic origin and low bioavailability of the metals in the studied soil. The average potential mobility for the metals giving the following order: Sn > Cu > Zn > Pb > Cr > As.