Taking south Baotou's urban vicinity,Inner Mongolia as research area,945 surface soil samples were collected to measure total concentrations of cadmium(Cd)and lead(Pb).According to"Determination of Land Quality Geochemical Evaluation"(DZ/T 0295-2016),investigation areas were divided into polluted areas and non-polluted areas,and 137 combined samples were selected to analyze existence state of soil Cd and Pb forms.Results indicated that Cd had an average concentration of 0.38 mg/kg,while Pb was 151.56 mg/kg on average in research soil.Compared with other combinations,binding states of Pb with humic acid and iron manganese oxides were notably stronger.Analysis based on potential ecological risk index indicated that Cd posed a substantial risk while Pb repres-ented a minor risk.Through the RAC method,it was determined that Cd carried an exceptionally high risk in 65.69%,with a signific-ant risk in 34.31%.Proportion of low risk in Pb elements reached 64.96%,and proportion of high risk or above was 35.04%.To sum up,potential ecological risk of Cd in investigation area was the highest,so it was necessary to reduce Cd content in the soil.Potential ecolo-gical risk of Pb was relatively high,and enough attention should be paid to it.
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