江阴市典型河流沉积物重金属污染和风险评价

发布时间：2018-06-27 12:27

本文选题：江阴市 + 重金属　；参考：《长江流域资源与环境》2017年07期

【摘要】：在摸清河流表层沉积物重金属(Cu、Zn、Pb、Cr、As)含量的基础上,利用综合污染指数和地累积指数评价其污染状况,计算潜在生态风险和人体健康风险。结果表明,江阴市河流沉积物已经受到重金属污染企业和城市径流双重影响,Cu、Zn、Pb峰值在汛期,As、Cr峰值在非汛期;污染负荷指数和地累积指数评价结果显示非汛期污染略轻,地累积指数法引入背景波动参数而使其评价结果较乐观。重金属潜在生态风险都为轻微风险级别;致癌风险处于10~(-3)数量级,非致癌风险数量级为10~(-7),致癌风险为人体健康风险主要承担者。潜在生态风险汛期高,人体健康风险非汛期高,这可能是重金属元素对致癌风险以及生态风险的贡献不同所致。
[Abstract]:On the basis of investigating the contents of heavy metals in the surface sediments of rivers, the comprehensive pollution index and the ground accumulation index were used to evaluate the pollution status and to calculate the potential ecological risk and human health risk. The results show that the river sediment in Jiangyin city has been affected by heavy metal pollution enterprises and urban runoff, and the peak value of Cu ~ (2 +) Zn ~ (+) Pb in flood season is in non-flood season, and the pollution load index and ground accumulation index are slightly less polluted in non-flood season. The method of ground accumulation index introduces background fluctuation parameter to make its evaluation result more optimistic. The potential ecological risks of heavy metals are all of slight risk level, carcinogenic risk is in the order of 10 ~ (-3), non-carcinogenic risk is 10 ~ (-7), carcinogenic risk is the main bearer of human health risk. The potential ecological risk is high in flood season and the human health risk is high in non-flood season, which may be due to the different contribution of heavy metal elements to carcinogenesis risk and ecological risk.
【作者单位】：河海大学水文水资源学院;南京水利科学研究院;
【基金】：江苏省水利科技项目(2012035)~~
【分类号】：X824

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