遵义县农业土壤重金属镉分布特征及地质累积污染分析

采用地质累积指数法和污染程度指数法对贵州省遵义县农业土壤表层镉（Cd）污染现状进行调查和分析,结果表明,该县0～15cm表层土壤中Cd平均含量为0.356mg/kg。通过地球化学基线理论分析,该区域土壤中Cd的环境地球化学基线含量为0.147mg/kg;地质累积污染分析显示Cd的Igeo为0.691,该区域13.84%...

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.