石门雄黄矿周边农田土壤重金属污染及健康风险评估

发布时间：2018-05-01 17:38

本文选题：雄黄矿 + 重金属　；参考：《土壤》2016年06期

【摘要】：湖南石门雄黄矿区环境污染及风险是当前国家环保部门和地方政府极为关注的重要环境问题之一。本研究以该矿区周边农田表层土壤为研究对象,调查分析了矿区周边农田土壤重金属污染状况及其空间分布特征,并采用美国EPA土壤健康风险模型评估了其对人体的健康风险。土壤重金属污染评价结果显示:该区土壤受到中度的As污染和Cd污染,As平均含量为80.26 mg/kg,Cd平均含量为0.55 mg/kg;Cu、Zn、Pb含量均未超过国家《土壤环境质量》的二级标准;综合污染指数显示研究区域为中度污染。美国EPA模型评估结果显示:成人和儿童的日暴露量及非致癌健康风险主要途径均为经手口摄入,Cd对成人和儿童均不存在非致癌风险和总风险,As对儿童非致癌总风险指数为3.36,造成严重的非致癌健康威胁;经呼吸暴露的致癌风险,Cd对儿童和成人均不造成致癌健康影响,As对成人和儿童的平均致癌风险指数为3.13×10~(-4)和5.58×10~(-4),均存在显著的致癌健康风险,且As、Cd对儿童的健康威胁均高于成人。可见,该矿区周边农田土壤中As、Cd污染及其风险应加强控制与治理。
[Abstract]:Environmental pollution and risk in Shimen realgar mining area is one of the most important environmental problems which the national environmental protection department and local government pay close attention to. In this study, the pollution status and spatial distribution of heavy metals in the farmland soil around the mining area were investigated and analyzed, and the health risk to human body was evaluated by the EPA soil health risk model of the United States. The results of heavy metal pollution evaluation showed that the average content of as was 80.26 mg 路kg ~ (-1) 路kg ~ (-1) CD, 0.55 mg / kg ~ (-1) Cu ~ (2 +) Zn ~ (2 +) Pb was not higher than the second grade standard of the National soil Environmental quality. The comprehensive pollution index showed that the study area was moderately polluted. The results of EPA model in the United States show that the main ways of daily exposure and non-carcinogenic health risk of adults and children are that there is no non-carcinogenic risk and the total risk of as is non-carcinogenic in children and adults. The total risk index was 3.36, which caused serious non-carcinogenic health threat. No carcinogenic health effects were observed in children and adults after respiratory exposure. The average carcinogenic risk index of as was 3.13 脳 10 ~ (-4) and 5.58 脳 10 ~ (-1) ~ (-4) respectively, and there was significant risk of carcinogenic health for both children and adults, and the health threat to children was higher than that of adults. It can be seen that the pollution and risk of arsenic and cadmium in farmland soil around the mining area should be controlled and controlled.
【作者单位】：南京信息工程大学环境科学与工程学院;中国科学院土壤环境与污染修复重点实验室(南京土壤研究所);
【基金】：中国科学院科技服务网络计划项目(KFJ-EW-ZY-005)资助
【分类号】：X53;X825

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