城市地下水饮用水源地水环境健康风险评价

应用美国环保局(USEPA)提出的健康风险评价模型,对山东省某市W地下水饮用水源地水环境健康风险进行了评价与分析.结果表明:水源地4种致癌污染物产生的健康风险为8.56×10-7⁵.07×10-4,集中开采段致癌风险均未超过国际辐射防护委员会(ICRP)推荐的最大可接受限值5.0×10-5;集中开采段周边个别点位致癌风险值远远高于最大可接受风险水平;优先控制致癌污染物是三氯乙烯、四氯化碳和苯;9种污染物的非致癌危害指数为0.405.07×10-4,集中开采段致癌风险均未超过国际辐射防护委员会(ICRP)推荐的最大可接受限值5.0×10-5;集中开采段周边个别点位致癌风险值远远高于最大可接受风险水平;优先控制致癌污染物是三氯乙烯、四氯化碳和苯;9种污染物的非致癌危害指数为0.40¹8.87,集中开采段及其周边均存在超过风险控制标准的点位,非致癌风险主要来自硝酸盐、三氯乙烯和三氯甲烷.

Water Environmental Health Risk Assessment for Urban Groundwater Drinking Water Sources

The health risk assessment model of USEPA is applied to the water environmental health risk assessment and analysis of W groundwater drinking water sources of a city in Shandong Province. Results indicate that ： （ 1 ） the health risk caused by 4 kinds of car- cinogenic substances ranges from 8.56 ×10^-7 to 5.07 ×10^-4. The cumulative cancer risk in centralized extraction lot is lower than the maximum acceptable limit value 5.0 ×10^-5 recommended by ICRP. The cancer risk of individual monitoring points in peripheral area is much higher than the maximum acceptable risk level. The carcinogenic contaminants which should be controlled preferentially are tri- chlorethylene, carbon tetrachloride and benzene; （2） the total hazard index caused by 9 kinds of contaminants ranges from 0.40 to 18.87. The hazard index in many points exceeds chronic hazard control standard. Nitrate, chloride and chloroform are the highest pri- ority pollutants.