WANG Yiqun1, XU Duanping1, XUE Yang1, WANG Jifeng1, MA Fujun2
(1. College of Environmental Science and Engineering, Liaoning Engineering Technology University, Liaoning Fuxin 123000, China;
2.State Key Laboratory of Environmental Criteria and Risk Assessment，Chinese Research Academy of Environmental Sciences，Beijing 100012，China)
Abstract: 14 soil samples contaminated with heavy metal in China were collected. Physico-chemical properties (pH, CEC, OM, powder and clay)of the soil samples were determined.4 fractionations percentage of Pb and Cd were also detected through improved BCR sequential extraction process.The correlation between the fractionation percentage of Pb, Cd and the physico-chemical properties of the soil samples and stepwise regression model were studied and built by SPSS 20.0. The results indicated that the acid-soluble fraction content of Pb and Cd were negatively correlated with pH, and correlation coefficient are -0.80 and -0.78, The acid-soluble fraction of Pb and Cd have a positive correlation with CEC, r=0.54 and 0.61; The acid-soluble fraction of Pb and Cd have no correlation with OM、powder and clay;The reducible fraction of Cd has a positive correlation with OM, r=0.56;There was also no significant correlation of reducible fraction of Cd with other properties; the oxidizable fraction of Pb and Cd has a positive correlation with OM and clay extremely, however has no correlation with other properties; No significant correlation of the residual fraction of Pb and Cd with pH, Eh, CEC, OM, powder content and clay content was identified.Good Stepwise regression results of acid-soluble fraction,reducible fraction,the oxidizable fraction and properties were discovered.
Key Words：soils; heavy metal; fractionation; stepwise regression
EARTH AND ENVIRONMENT Vol.46, No.5, Tot No.325, 2018, Page 451-455
