再生水中消毒副产物——卤乙酸的测定方法研究

参照美国国家环保局(USEPA)推荐的饮用水卤乙酸类消毒副产物测定方法(Method 552.3),通过优化该方法的预处理条件和改变检测方法,提出了酸化萃取-衍生化-中和萃取-GC-MS测定再生水中卤乙酸含量的分析方法,并分析了北方某市再生水中4种卤乙酸类消毒副产物含量。结果表明,该方法适用于我国再生水水质,能够有效地消除再生水中共存污染物的干扰;其相对标准偏差(n=7)小于10%,方法的精密度较好;检出限与USEPA方法基本一致;样品加标回收率满足USEPA 6251B标准方法中(100±30)%要求;再生水中的卤乙酸比自来水高出几十倍,对环境和人类存在一定的潜在危害。

Study on determination method of haloacetic acids in reclaimed water

Based on method 552.3 that is a standard method recommended by the USEPA for the determinations of disinfection byproduct HAAs in drinking water, the determination method of haloacetic acids (HAAs) in reclaimed water was proposed by optimizing the course of sample pretreatment and changing the detection approach. The method included acidified extraction, derivatization, neutrallzed extraction, and GC-MS, and the method was used to analyze four kinds of HAAs disinfection byproduct in reclaimed water samples located at a northern city of China. The result showed that the method can effectively eliminate coexist disturbance applying to China's reclaimed water quality and has good precision giving RSD(n=7) of below 10%, detection limit is basically the same as the USEPA method, recovery rate of water samples meet the USEPA 6251B (100±30)% requirements and four kinds of HAAs concentration in reclaimed water are a few times higher than in tap water, which has some potential hazards to the environment and human.