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再生水在回用过程中氯消毒副产物对人体产生的危害逐渐引起人们的关注。在USEPA552.3(2003)标准方法的基础上,建立了适用于检测再生水中氯消毒副产物4种卤乙酸(haloacetic acids,HAAs)的分析方法,并对加氯量、UV254、氨氮浓度等影响因素及控制方法进行了研究。研究表明,方法前处理过程简单、安全,内标、HAAs组分峰在谱图分辨良好;4种HAAs在浓度范围1～150μg/L内呈线性关系,校准曲线相关系数均大于0.999;加标回收率在82.27%～119.9%之间,满足标准方法的要求;HAAs浓度随加氯量的增大而增大,随氨氮浓度的增大而减小,随UV254的变化不明显;先加氨后加氯的消毒方式产生的HAAs浓度最低,两点加氯产生的HAAs总量要少于单一点加氯。
Reclaimed water in the recycling process of chlorine disinfection by-products harm to the human body has gradually attracted people’s attention. Based on the standard method of USEPA552.3 (2003), four analytical methods of haloacetic acids (HAAs), which are the by-products of chlorine disinfection in reclaimed water, were established and their effects on chlorination, UV254, ammonia nitrogen concentration Factors and control methods were studied. The results showed that the pretreatment process was simple and safe, the internal standard and HAAs peaks were well resolved in the spectra. The linearity of four HAAs in the concentration range of 1 ~ 150μg / L and the correlation coefficients of the calibration curve were all greater than 0.999. The recoveries ranged from 82.27% to 119.9%, which satisfied the requirements of standard methods. The concentration of HAAs increased with the increase of chlorination and decreased with the increase of ammonia concentration, but not with the change of UV254. The post-chlorination disinfection method produced the lowest concentration of HAAs, and the total amount of HAAs produced by two-point chlorination was less than that of single point chlorination.