为了解湖南省郴州市东河流域耕地土壤重金属污染情况,本文分别运用潜在生态危害指数法和健康风险评价模型,对东河流域耕地土壤重金属污染生态风险和健康风险进行了分析和评估.研究结果表明,东河流域耕地土壤 Cd、Pb、As、Cu、Zn 含量平均值超湖南省土壤背景值,Cd、Pb 和 As 累积程度显著.重金属污染总体属于很强污染,研究区土壤重金属潜在生态风险危害已形成,其中Cd污染程度最高,是东河流域耕地土壤中重金属潜在生态危害的主要贡献因子.健康风险评估显示6 种重金属对成人和儿童不会造成非致癌风险,对人体基本上不会造成健康危害.Pb 对成人和儿童可能有潜在的致癌风险,总致癌风险指数处于不可接受范围内.因此,Cd、As、Pb是东河流域耕地重金属污染防治的重点.
Risk Assessment and Health Risk Assessment of Soil Heavy Metal Pollution in Donghe River Basin of Chenzhou City,Hunan Province
In order to understand the heavy metal pollution situation of farmland soil in the Donghe River Basin of Chenzhou City,Hunan Province,this article uses the potential ecological hazard index method and the health risk assessment model to analyze and evaluate the ecological and health risks of heavy metal pollution in farmland soil in the Donghe River Basin.The research results indicate that the average content of Cd,Pb,As,Cu,and Zn in cultivated soil in the Donghe River Basin exceeds the background value of soil in Hunan Province,and the accumulation degree of Cd,Pb,and As is significant.The overall heavy metal pollution belongs to strong pollution,and the potential ecological hazards of heavy metals in the soil of the study area have been formed.Among them,Cd pollution is the highest and is the main contributing factor to the potential ecological hazards of heavy metals in cultivated soil in the Donghe River Basin.The health risk assessment shows that six heavy metals do not pose a non carcinogenic risk to adults and children,and do not pose a significant health hazard to the human body.Pb may have potential carcinogenic risks for adults and children,and the total carcinogenic risk index is within an unacceptable range.Therefore,Cd,As,and Pb are the key points for the prevention and control of heavy metal pollution in farmland in the Donghe River Basin.
east River basin cultivated landsoil heavy metalspotential ecological hazard indexhealth risk assessment
NETL
NSTL
万方数据
