【摘要】 目的评估北京市朝阳区自来水中三卤甲烷对成人的致癌风险。方法分别于2009年冬天（11—12月）和2010年夏天（7—8月）,对朝阳区随机抽取的100户家庭进行调查和自来水（市政供水、二次供水和自备供水）水样采集,测定水中氯仿、一溴二氯甲烷、二溴一氯甲烷、溴仿4种三卤甲烷的浓度。采用美国环保局推荐的致癌风险评价方法和蒙特卡罗（Monte-Carlo）模拟对自来水中三卤甲烷的致癌风险进行概率分析。结果自来水中氯仿、一溴二氯甲烷、二溴一氯甲烷、溴仿累积概率为90%时的致癌风险分别为2.0×10^-6、1.4×10^-5、1.1×10^-5、1.1×10^-6。致癌风险最高的是二次供水,其次为市政供水和自备供水。结论北京市朝阳区自来水中三卤甲烷对成人具有潜在的致癌风险。更多还原

【Abstract】 Objective To evaluate the cancer risk of trihalomethanes in tap water for the adults in Chaoyang district, Beijing.Methods A total of 100 families were randomly selected in Chaoyang district.The tap water（including municipal water,secondary water and community water） of those families were collected in winter（November-December,2009） and summer（July-August,2010） respectively.The concentration of CHC1₃,CHBrCl₂,CHBr₂Cl and CHBr₃ were determined.The cancer risk assessment formula recommended by the United States Environmental Protection Agency（US EPA） and Monte-Carlo Simulation were used to assess the cancer risk of trihalomethanes in tap water.Results When the cumulative probability was 90%,the cancer risk of trihalomethanes in tap water were 2.0×10^-6（CHC1₃）,1.4×10^-5（CHBrCl₂）,l.l×l0^-5（CHBr₂Cl）, 1.1×10^-6（CHBr₃） respectively.The cancer risk of three types of tap water from high to low were secondary water,municipal water and water supply for self-use.Conclusion The trihalomethanes in tap water has potential cancer risk for the adults in Chaoyang district,Beijing.更多还原