Abstract
Chemical contamination is an important issue for large-scale soils in China, especially the contamination of chemical heavy metals. Under this background, this paper focuses on the experimental method to explore the effects of two soil amendments (lime and phosphate) on reducing soil heavy metal activity and improving soil quality. In this paper, the biological evaluation method was used to test the effects of different soil amendments by taking the soil conductivity, chlorophyll and heavy metal content in the plant as the main evaluation indicators. The research results show that the effect of different soil amendments is greatly related to the concentration of the soil amendment solution, of which 5% of lime water can effectively reduce the activity of heavy metal Zn in soil, but not effective on Pb; the concentration 7.5% of the phosphate solution can effectively reduce the activity of heavy metal Pb in soil but cannot reduce the activity of Zn. This provides an effective solution to the problem of heavy metal pollution in Chinese soil chemistry, especially the pollution of Pb and Zn.
