电镀厂周边地表水中重金属分布特征及健康风险评价

发布时间：2018-04-06 02:06

  本文选题：电镀厂　切入点：地表水　出处：《环境科学》2017年03期

【摘要】：选取东莞市麻涌镇、沙田镇、虎门镇、长安镇和大岭山镇为研究区域,对区域电镀厂周边30个地表水样中8种重金属(包括Cd、Cr、Cu、Ni、Pb、Zn和类重金属As、Hg)进行测定,运用多元统计分析法和人体健康风险评价模型研究地表水中重金属分布特征和健康风险.结果表明,地表水中Cr、Pb最大浓度和Hg平均浓度超过《地表水环境质量》(GB 3838-2002)Ⅲ类水质标准,Cr、Cu、Hg、Ni、Zn和Pb含量均呈现出雨季高于旱季.多元统计分析表明,Cd、Cr、Cu、Ni和Zn主要来源于周边电镀企业污染,Pb和Hg受交通污染源影响较大,As与自然源有密切关系.地表水体健康风险评价结果表明,重金属污染对儿童威胁大,经饮水途径暴露的健康风险比皮肤接触途径大2~3个数量级.此外,Cr和As致癌风险高于最大可接受风险水平(5.0×10-5a-1);非致癌性重金属健康风险大小呈现出PbNiCuHgZn,风险水平在10-10~10-7a-1,低于最大可接受风险水平2~5个数量级.
[Abstract]:In this paper, eight heavy metals (including CDDX, CU, NiNiPbPbPbPbPbGZn and As-Hg) in 30 surface water samples around the electroplating plant in Dongguan City were selected as the study area, including Magong Town, Shatian Town, Humen Town, Changan Town and Dalingshan Town as the study area, and the results showed that the heavy metals in the 30 surface water samples around the electroplating plant were determined.The distribution characteristics and health risk of heavy metals in surface water were studied by multivariate statistical analysis and human health risk assessment model.The results show that the maximum concentration of Cr ~ (2 +) Pb and the average concentration of Hg in surface water are higher than those in "environmental quality of surface water" (GB3838-2002)) the contents of Zn and Pb in class 鈪，

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