Abstract: 【Objective】 To conduct comparative analysis of the different contents of heavy metals in farmland soil between Layisu longevity village and the control area of Yutian County in Xinjiang, this paper aims to make clear the health risk of heavy metals in the soil of two control groups to the local population.【Method】This paper used the Muller geoaccumulation index method to evaluate the soil environmental quality of the two groups, and U.S.EPA health risk assessment model to evaluate the health risk of soil heavy metals.【Result】No heavy metals pollution was found in farmland soil of Layisu longevity village. Ni and As contents were over standard in a few sampling points of the control area. The Risk_all and HQ_all in control groups showed that heavy metals in the control area were greater than those of Layisu longevity village.【Conclusion】The contents of heavy metals in soil of Layisu longevity village are lower than those in the control area. The soil As can cause an acceptable carcinogenic risk to body in both control groups (10^-6＜Risk_all ＜10^-4). The soil Cr and Cd are not likely to cause carcinogenic risk for both adults and children (Risk_all ＜10^-6). The soil heavy metals will not cause non-carcinogenic risk for both adults and children in the control groups (HQ_all ＜1).

Key words: farmland soil; heavy metal; environmental quality; health risk assessment

摘要： 【目的】对比分析新疆于田县拉依苏长寿村与对照区农田土壤重金属含量的差异性,明确两对照组土壤中重金属元素对当地人口的健康风险。【方法】利用Muller地质累积指数法对两对照组土壤环境质量进行评价,采用U.S.EPA推荐的健康风险评价模型对两对照组土壤重金属元素引起的健康风险作对比评价。【结果】拉依苏长寿村不存在土壤重金属污染现象,对照区个别采样点Ni、As含量超标。两对照组健康风险评价的Risk_all与HQ_all均表现为:对照区＞拉依苏长寿村。【结论】拉依苏长寿村土壤重金属含量低于对照区,土壤中As对两对照组人体产生可接受致癌风险(10^-6＜Risk_all＜10^-4);Cr、Cd不会对成人和儿童产生致癌风险(Risk_all＜10^-6);土壤中的重金属均不会对两对照组的成人和儿童产生非致癌风险(HQ_all＜1)。

关键词: 农田土壤, 重金属, 环境质量, 健康风险评价