Abstract:

Chemical stabilization was a practical technique which uses inexpensive amendments to reduce heavymetal availability in polluted soil.This paper evaluated the effects of application of several amendments (lime,furnace slag and straw) on the immobile efficiency of heavy metals such as Cu，Cd and Zn and soil respiration rate (index for soil microbial activity) in a mine tailing soil in Tongling City.The results showed the application of the amendments significantly increased soil respiration rate(p<0.05) and enhanced soil microbial activity,and decreased the amount of available heavy metals such as Cu，Cd and Zn (p<0.05) except the weak immobile efficiency of lime and furnace slag on Cu,and straw on Cd and Zn,individually.Of all selected amendments,lime,furnace slag and straw coexisted in soil displayed the most satisfactory immobile efficiency of about 94.28%,78.10% and 98.57% for Cu，Cd and Zn,respectively.Analysis with Pearson’s correlation coefficient further indicated that amendment of alkaline materials and organic matters both in soil had better immobile ability for heavy metals,advancing soil microbial activity,and improved microbial toxicitytolerance ability on heavy metals. It could be a good choice to use mixed alkaline materials and organic matters to restore heavymetals contaminated soil in practice