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Speciation and Ecological Risk Assessment of Heavy Metals in Soil from Anxi Tieguanyin Tea Garden
Pages: 359-369
Year: Issue:  3
Journal: Geology-Geochemistry

Keyword:  soilheavy metalspeciationecological risk assessment;
Abstract: Modified BCR sequential extraction procedure was applied to extract the speciation of heavy metals( Li,Fe,Zn,Ba,Sr,Ti,Co,Cr,Cd,Mn,Mg,Cu,Ni,Pb,and V) in soil from Anxi Tieguanyin Tea Garden. The bioavailability and ecological risk of heavy metals were evaluated. Results of extraction test show that the speciation of Cd decreases in the order of acid soluble>residual>reducible>oxidizable; the speciation of Pb decreases in the order of reducible>oxidizable>acid soluble>residual; the speciation of Cu decreases in the order of reducible>oxidizable>residual>acid soluble; and the other heavy metals are mainly residual state. Bioavailability analysis results show that the potential bioavailability of Pb,Cd,Cu,Mn,Ni,and Sr is higher,with percentage compositions of90. 4%,73. 0%,36. 6%,32. 8%,36. 6% and 22. 9%,respectively. Both the geo-accumulation index and potential ecological risk assessment for heavy metals in garden soil show that majority soil are clean and safe but some garden soil have suffered the pollution of Cd,reaching moderate pollution level.
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