农村土壤重金属含量分布与健康风险评价

摘要

依据农村土壤监测结果,对饮用水源地周边、耕地、居民区周速和养殖场周边土壤的重金属指标进行含量分布和健康风险评价.结果表明:农村土壤中重金属含量的顺序为Cr ＞Pb ＞As＞ Cd＞ Hg;农村养殖场周边土壤中重金属的含量较其他3个点位均偏高;重金属对2类暴露人群的非致癌风险可以忽略;重金属Cr、As和Cd呼吸吸入致癌风险均明显小于10-6,重金属As经口摄入、经皮肤接触致癌风险对儿童和成年人的致癌风险均介于可以接受范围内.%Based on the results of monitoring in rural soil,the content distribution and health risk assessment of heavy metals in the surrounding area of drinking water sources,cultivated land,residential area and farms were evaluated.The results demonstrated that the content of heavy metal in rural soil was Cr ＞ Pb ＞ As ＞ Cd ＞ Hg;The contents of heavy metals in the soil around the farm were higher than those of the other three sites;The non carcinogenic risk of heavy metals in the two kinds of exposed population can be ignored;Heavy metals such as Cr,As and Cd were significantly less than 10-6 in respiratory inhalation cancer risk;The carcinogenic risk of As between oral intake and dermal contact to children and adtlts were within acceptable limits.