辽阳市典型农村地下水水源有机物监测及健康风险评估

为保障辽阳市农村居民饮水安全,对辽阳市典型农村地下水水源的有机物进行了监测和健康风险评估。辽阳市农村地下水水源的主要有机污染物为邻苯二甲酸二(2-乙基己基)酯、邻苯二甲酸二丁酯、三氯乙烯、二氯甲烷和三氯甲烷,其中邻苯二甲酸二(2-乙基己基)酯和三氯甲烷有明显超标现象。结合中国人习惯饮用开水的国情,将有机物经煮沸1 min中的残留比引入健康风险评估模型,对地下水水源中的有机物进行健康风险评估。三氯甲烷的饮水致癌风险值大于可接受值1×10-6,处于10-4~10-6这个范围,可能对人体健康造成危害。有机污染物的非致癌风险值小于1,不会对暴露人群健康造成明显的非致癌危害。

In order to ensure the drinking water security of rural residents in Liaoyang city, organic compounds in the typical rural groundwater source were monitored and the health risks are assessed. Main organic pollutants in rural underground water are di （2-ethylhexyl）phthalate （DEHP）, dibutyl phthalate, trichloroethylene, methylene chloride and chloroform, and DEHP and chloroform exceeded standard. Combining with the condition that Chinese is used to drinking boiled water, the residue ratio of organic compounds in water through boiling for 1 min was in- troduced into the health risk assessment model, and the organic compounds in groundwater were assessed on the health risks. The drinking cancer risk index of chloroform （10^-4±10^-6） was higher than the acceptable value （1×10^-6） and may cause harm to human health. Non-carcinogenic risk indexes of organic compounds are below 1, and organic pollutants would not cause non-carcinogenic health hazard to exposed population.