北京地区农用地土壤重金属污染与健康风险评价

为系统了解北京地区农用地土壤重金属污染状况，通过检索收集2000年以来北京地区农用地土壤重金属污染相关研究文献数据，并结合空间分析、地累积指数法和人体健康风险评价等方法对其分布规律、污染状况和健康风险进行研究。结果表明，北京地区农用地土壤中8种重金属（As、Cd、Cr、Cu、Hg、Ni、Pb和Zn）平均含量均低于筛选值，但大部点位的重金属含量已超背景值且存在明显的空间变异。地累积指数污染评价显示区域土壤Hg和Cr地累积风险最大，其污染点位占比分别达82%和67%，其余重金属累积污染风险较低。不同暴露途径下，各单一重金属或复合作用导致的非致癌和致癌风险均为可接受水平。但相较于其他重金属而言，土壤As的潜在致癌和非致癌风险最大，建议相关部门加强区域土壤As的监测与管控治理，以期实现区域农业活动可持续绿色安全生产。

Heavy Metal Pollution and Health Risk Assessment of Agricultural Land Soil in Beijing Area

In order to systematically study the heavy metal pollution status of agricultural land soils in Beijing area, the distribution law, pollution characteristics and health risk of heavy metals in farmland soils in Beijing were studied based on the literature data related to heavy metal pollution in agricultural land soil in Beijing since 2000, and the integrated use of spatial analysis, geo-accumulation index and human health risk assessment methods. The results show that the average contents of eight heavy metals (As, Cd, Cr, Cu, Hg, Ni, Pb and Zn) in farmland soil are all lower than the screening value, but their contents in most of the examining points have exceeded the background value and show significant spatial variation. The geo-accumulation index pollution evaluation results show that the accumulation risks of soil Hg and Cr are the highest in the region, with pollution points accounting for 82% and 67%, respectively. The accumulation risk of other heavy metals is relatively low. Under all kinds of exposure routes, the non-carcinogenic and carcinogenic risks caused by individual heavy metal or combined effects are acceptable. However, compared to other heavy metals, soil As has the highest potential carcinogenic and non-carcinogenic risks. Therefore, in order to achieve sustainable green and safe production of regional agricultural activities, it is recommended that relevant departments should strengthen the monitoring, control and management of regional soil As contents.