农用地土壤中重金属水平及潜在生态风险评价——以宁夏石嘴山地区为例

Evaluation on Heavy Metal Levels and Potential Ecological Risks in Agricultural Soils——A case study of Shizuishan region of Ningxia

分析宁夏石嘴山地区农用地土壤中As,Cd,Cr,Hg,Pb 5种重金属的含量及其累计状况.依据GB 15618—2018,通过地累积指数分析和土壤重金属潜在生态风险评价潜在生态指数法,对石嘴山地区农用地土壤的质量状况和潜在生态风险进行分析和评价.结果表明,As,Cd,Cr,Hg,Pb 5种重金属的平均质量含量均未超过风险筛选值;地累积指数均小于零,污染程度为无污染;单一金属潜在生态风险指数中Hg的为49.23,潜在生态风险程度为中等,其他元素潜在生态风险程度为低微;5种金属潜在生态风险综合指数为100.56,潜在生态风险程度为轻微.

The article analyzed the content and cumulative status of five heavy metals:As,Cd,Cr,Hg,Pb in agricultural soils in Shizuishan,Ningxia.The soil quality status and potential ecological risks of agricultural land in the Shizuishan region was analyzed and evaluated by geographical cumulative index analysis and potential ecological index method for potential ecological risk assessment of heavy metals in soil,according to soil environmental quality risk control standard for soil contamination of agricultural land(GB 15618—2018).The results show that the average mass content of the five heavy metals:As,Cd,Cr,Hg and Pb did not exceed the risk screening values;the ground accumulation index was less than zero,and the pollution degree none pollution;the potential ecological risk index Hg of single metal was 49.23,the potential ecological risk degree medium,and the potential ecological risk degree of other elements low;the comprehensive index of potential ecological risk for five metals was 100.56,presenting slight potential ecological risk.