摘要
Sixty-two soil samples collected from different functional zones of Guiyang were analyzed for total con-centrations and sequential extraction of Cr,Cu,Pb,Zn and Cd by ICP spectrometry. The average total concentrations of Cr,Cu,Pb,Zn and Cd in the soils of Guiyang were 92.9,51.6,44.1,139.3 and 0.28 mg/kg,respectively. The soils have been polluted by Cr,Cu,Pb,Zn and Cd to some extent in comparison with the background values of Guiyang. Significant differences were recognized in the concentrations of Cr,Cu,Pb,Zn and Cd in different functional zones. As for the sequential extraction,Cr,Cu and Zn were present mainly in the residual fraction,and Pb was present mainly in the oxidizable fraction. The reducible fraction of Cd accounts for 47.5%,and the residual fraction is lowest. The mobility and bioavailability of heavy metals follow the order of Cd>Pb>Cu>Cr>Zn.
Sixty-two soil samples collected from different functional zones of Guiyang were analyzed for total concentrations and sequential extraction of Cr, Cu, Pb, Zn and Cd by ICP spectrometry. The average total concentrations ofCr, Cu, Pb, Zn and Cd in the soils of Guiyang were 92.9, 51.6, 44.1,139.3 and 0.28 mg/kg, respectively. The soils have been polluted by Cr, Cu, Pb, Zn and Cd to some extent in comparison with the background values of Guiyang. Significant differences were recognized in the concentrations of Cr, Cu, Pb, Zn and Cd in different functional zones. As for the sequential extraction, Cr, Cu and Zn were present mainly in the residual fraction, and Pb was present mainly in the oxidizable fraction. The reducible fraction of Cd accounts for 47.5%, and the residual fraction is lowest. The mobility and bioavailability of heavy metals follow the order of Cd〉Pb〉Cu〉Cr〉Zn.
基金
financially supported by the Ministry of Science and Technology of China through National Program on Key Basic Research Project (Grant No.2006 CB403200)
关键词
贵州
土壤
重金属
物种形成
soil
heavy metal
speciation
Guiyang City
