饮用水源地塑化剂类污染物环境健康风险评估

Environmental health risk assessment of plasticizer contaminants in drinking water source

通过对我国南方某备用水源地枯水期的水质测试分析,发现邻苯二甲酸酯检出,应用美国环境保护署(USEPA)的方法对该饮用水源地邻苯二甲酸酯类有机污染物进行了环境健康风险评估.结果显示,邻苯二甲酸正丁酯(DBP)、邻苯二甲酸二乙酯(DEP)、邻苯二甲酸二(2-乙基己基)酯(DEHP或DOP)均有检出,DOP的最大致癌风险为7.32×10-8,DBP、DEP和DOP的最大非致癌风险分别为3.94×10-5、2.73×10-6和2.62×10-4.该水源地的邻苯二甲酸酯的致癌风险值小于1×10-6,非致癌风险值远小于1,均未超过国际规定,在可接受风险范围内.但相对国内外同类地区,邻苯二甲酸酯的浓度偏高,存在一定的潜在健康风险,需要根据邻苯二甲酸酯的可能来源在水源地环境风险管理中加以防范.

Through the water quality test of a South China reservior water source in low water period analysis, the study found that phthalic acid esters were detected. Environmental health risk assessment of phthalic acid esters of the drinking water source was studied using the United States Environmental Protection Agency(USEPA) method. The results showed that two, phthalic acid butyl ester(DBP), adjacent benzene two formic acid ethyl ester(DEP), phthalic acid two(two-ethylhexyl) ester(DEHP orDOP) were detected. Maximum carcinogenic risk of DOP was 7.32×10-8, and maximum non carcinogenic risk of DBP, DEP and DOP respectively was 3.94×10-5、2.73×10-6 and 2.62×10-4. Carcinogenic risk value of phthalic acid esters of water source was less than 1×10-6, and non carcinogenic risk value was less than 1, which were no more than international regulation, and were in the context of acceptable risk. But concentration of phthalic acid esters was higher than the relative domestic and foreign similar area, so there were potential health risks. It needs to prevent water environment risk according to the possible sources of phthalic acid esters.