DISTRIBUTION AND GEOLOGY ACCUMULATION CONTAMINATION ANALYSIS OF HEAVY METAL CADMIUM IN AGRICULTURAL SOIL OF ZUNYI COUNTY

The pollution of heavy metal Cd in agricultural soils of Zunyi County,Guizhou Province,was investigated and assessed by using geology accumulation indices(igeo) and pollution index method in this study.Results showed that the average content of Cd is 0.356 mg/kg,and the geochemistry baseline content of Cd was 0.147 mg/kg.The Igeos of Cd was 0.691,which suggested that non-contaminated soil accounts for 13.84%,59.17% of tested soils was between non-polluted and mid-level polluted,21.37% with mid-level polluted and 5.17% was between mid-level polluted and severely polluted,0.45% of which was severely polluted.Contamination degree analysis indicated that non-contaminated soil was only 10.57%,54.44% was influenced by Cd and 34.98% was seriously influenced by Cd.