黔江区农业区域土壤重金属健康风险评价

摘要

采用地积累指数和健康风险,对黔江区农业土壤中As、Cd、Cr、Cu、Pb、Ni、Zn、Hg重金属进行评价.从重庆市土壤重金属背景值计算的地积累指数结果来看,黔江区农业区域土壤中只有Hg的地积累指数为0.18,达到轻度污染,而其它7种重金属均没有对土壤造成污染;通过健康风险评价模型来计算,重金属暴露风险商HQ和风险指数HI均小于1,不会对身体健康造成危害;结果表明:土壤中As、Cr、Cd和Ni各元素经呼吸途径不具有致癌风险.%Sample of soil was collected from agricultural farmland in Qianjiang district. The index of geoaccmulation was used to indicate the extent of heavy metal pollution. The health risk assessment model recommended by the USA EPA was used to calculate the intake of heavy metals through halation and skin exposure. The assessment results of geoaccumulation index of potential ecological risk indica-ted that only Hg was mild pollutant. Health risk assessment indicated that the non-cancer risk value is less than 1,indicating a relatively low health risk. Carcinogen risks(As,Cr,Cd,Ni)were lower than their threshold values,suggesting that they will not harm the health.