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环境化学  2015 

DOI:10.7524/j.issn.0254-6108.2014.02.003

Keywords: 成都平原,水稻土,重金属,健康风险评价

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Abstract:

采样分析了成都平原表层水稻土(0—20cm)中As、Cd、Cr、Hg、Pb、Cu、Zn含量,参照国家土壤环境质量标准和土壤背景值,并利用健康风险评价模型对土壤重金属环境质量状况和人体健康风险进行了评价.结果表明,成都平原水稻土表层7种重金属平均含量分别为As9.69mg·kg-1、Cd0.12mg·kg-1、Cr79.5mg·kg-1、Hg0.04mg·kg-1、Pb47.5mg·kg-1、Cu29.3mg·kg-1、Zn81.7mg·kg-1.与成都地区土壤背景值相比,As、Cr、Pb、Cu、Zn在表层水稻土中有明显积累,部分样区土壤重金属超过《土壤环境质量标准》(GB15618—1995)标准值的二级标准,存在外源污染输入,但污染程度较轻.人体健康风险分析结果表明,经土壤-口接触行为摄入是该区域人体重金属暴露风险的主要途径,重金属致癌风险As>Cd,非致癌总风险Cr>Cu>Hg>Pb>Zn,无论儿童还是成人,重金属致癌风险值和非致癌风险值均低于风险阈值,风险值均在可接受水平内,但儿童健康风险值高于成人,应加强监管.

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