JIANG Songhe1, HU Gongren1,2, YU Ruilian1, BIAN Kai1, HUANG Xiaoshuang1
(1.Department of Environmental Science and Engineering, Huaqiao University, Xiamen 361021 China;
2. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081 China; )
Abstract: Modified BCR sequential extraction procedure was applied to extract and examine 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, analyze its biological effectiveness and make an ecological risk assessment. Results of extraction test show that the forms of Cd decreases in the order of acid soluble> residual> reducible> oxidizable; the forms of Pb decreases in the order of reducible> oxidizable> acid soluble> residual; the forms of Cu decreases in the order of reducible> oxidizable> residual> acid soluble; and the rest of the 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 of 90.4%, 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, and reach the moderate pollution leave.
Key words: soil; heavy metal; speciation; ecological risk assessment
EARTH AND ENVIRONMENT Vol. 44, No.3 Tot No.311, 2016, Page 359-369
