Abstract
The distribution of heavy metals (Cu and Zn) and their geochemical speciation (exchangeable fraction, carbonate fraction, Fe/Mn oxide fraction, organic fraction and residual fraction) in wetland soils of Poyang Lake were examined by modified Tessier sequential extraction methods. The results showed that the Cu and Zn concentrations in the wetland soils were 6.83–342.54 mg·kg−1 and 34.39–195.36 mg·kg−1, respectively. The highest heavy metal concentrations were found in the wetland soils located in the lower reaches of mines and metal smelters. The metal speciation analysis showed that Cu and Zn were mainly linked to the residual fraction in all samples which account for 65.64% and 68.14%, respectively. The content of the exchangeable fraction (Cu 1.00%, Zn 3.60%) and carbonate fraction (Cu 2.09%, Zn 1.53%) was generally lower. Assessments of pollution levels revealed that Cu and Zn were much higher than their background value and heavy metal pollution in the wetland soils located in the lower reaches of mines and metal smelters was often more severe. The sites Duchang and Hukou were least polluted by Cu and Zn.
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