长江口南通地区饮用水源地健康风险评价

Health Risk Assessment of Water Supply Sources in Yangtze Estuary Area

对长江口南通地区饮用水源地中镉、砷、六价铬等有毒有害物质的浓度进行了调查,并应用目前美国环保局推荐的健康风险评价模型对各饮用水源地有毒有害物质所引起的健康风险做了初步评价。结果表明,长江口南通地区饮用水源地通过饮水途径基因毒物质中化学致癌物所产生的健康风险的数量级为10-8～10-5,其中As在如海河和新通扬运河所引起的致癌风险最大,高于国际辐射防护委员会(ICRP)推荐的通过饮水途径最大可接受风险水平;通过饮水途径引起的非致癌健康风险远低于ICRP推荐的最大可接受风险水平。基因毒物质中砷和六价铬这2种毒物应被列为该地区饮用水源地水和水厂制水过程中优先检测和控制的致癌污染物,应重点关注基因毒物质六价铬和砷对人体所产生的健康风险。

Concentrations distribution of the Cr,As,Cd and so on,in drinking water in source and drinking Water of Yangtze Estuary Area was studied.Health risks associated with 16 pollutants in drinking water were assessed using USEPA health risk assessment model.The results showed that： among the risks caused by the carcinogens in drinking water,the largest risk associated with As should be in RuHai River and that in new TongYang River,while both were significantly higher than the maximum allowance levels recommended by ICRP.The non-carcinogenic risks levels ranged from 10-12to 10-9,much lower than the maximum allowance levels recommended by ICRP.The risks caused by the carcinogens in drinking water is about 99% of total risks.Great attention should be take to these pollutants while monitoring and producing.