安徽某典型矿区周边土壤重金属健康风险评价

    Human Health Risk Assessment of Heavy Metals in Soil around a Typical Mining Area in Anhui Province

    • 摘要: 为明确安徽典型金属矿区周边土壤重金属污染及人体健康风险, 以铜陵某金属矿区为研究对象, 采集矿区周边土壤样品, 测定As、Cd、Cr、Cu、Hg、Mn、Ni、Pb、Fe和Zn共10种重金属含量, 采用美国环保署(USEPA)开发的健康风险评价模型进行土壤健康风险评价。结果表明, 研究区10种重金属分布形态属于正偏态, Cr和Ni含量分布特征主要受成土母质影响, 而其他8种重金属含量分布特征主要受人类活动因素的影响; 手口途径是引起人体健康风险的主要暴露途径; 儿童的非致癌风险和致癌风险均大于成人; As、Cr、Pb和Mn是引起该区域非致癌风险的主要贡献因子, 而As和Cd是该区域致癌风险的主要贡献因子; 研究区非致癌风险和致癌风险的空间分布大致相似, 均存在不同程度的高风险等级, 高值区主要分布于研究区的中部和西部, 呈面源分布态势, 有必要采取有效措施对矿区重金属污染实施分区管控, 以降低人群特别是儿童的健康风险水平。

       

      Abstract: To clarify heavy metal pollution levels and human health risks around a typical metal mining area in Anhui Province, soil samples were collected from a metal mining area in Tongling. The contents of ten heavy metals (As, Cd, Cr, Cu, Hg, Mn, Ni, Pb, Fe and Zn) were determined, and the health risk assessment model developed by the United States Environmental Protection Agency was used to evaluate the health risk of the soil. The distribution patterns of the ten heavy metals in the study area were positively skewed; the distribution characteristics of Cr and Ni were mainly affected by the soil-forming parent material, while those of the other eight heavy metals were mainly affected by human activities. The hand-mouth route was the primary exposure to human health risks, and the risk of non-carcinogenicity and carcinogenicity in children was greater than that in adults. As, Cr, Pb, and Mn were the main contributors to the non-carcinogenic risk, while As and Cd were the main contributors to the carcinogenic risk. The spatial distribution of non-carcinogenic and carcinogenic risks in the study area was roughly similar, and there were different degrees of high risk levels; the high-risk areas were mainly distributed in the central and western parts of the study area, indicating non-point source distribution. It is necessary to take effective measures to implement zoning control of heavy metal pollution in mining areas to reduce the health risk level to nearby populations, especially children.

       

    /

    返回文章
    返回