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对DBPs生成过程中卤素离子间的竞争关系进行了定性和定量分析。定性分析时,提出η(DBPs)的概念,合理解释了不同DBPs随投氯量变化不一致的情况,并发现η(CHClBr_2)和η(BCAA)随投氯量增大而不断减小。定量分析时,发现Cl/Br值对于DBPs组成有很大的影响,Cl/Br值的增加会促使DBPs组成向高氯低溴方向变化。回归分析发现,η(Br)_(THMs)和η(Br)_(DHAAs)与ln(C1/Br)之间有很强的线性关系,线性相关系数(R~2)分别为0.961和0.991。计算得到在THMs和DHAAs生成过程中,HBrO竞争DBPPs的能力分别达到HClO的90和80倍。同时发现TTHMs和TDHAAs生成量与ln(Cl/Br)之间有很强的线性关系,线性相关系数(R~2)分别为0.968和0.904,降低水中Br~-浓度对于控制饮用水中常见DBPs总量有着积极意义。
The competition between halogen ions in DBPs was qualitatively and quantitatively analyzed. In the qualitative analysis, the concepts of η (DBPs) were proposed to reasonably explain the inconsistency of different DBPs with the change of the dosage of chlorine. It was found that η (CHClBr_2) and η (BCAA) decreased with the increase of the dosage of chlorine. Quantitative analysis showed that the Cl / Br value had a great influence on the composition of DBPs. The increase of Cl / Br value would lead to the change of DBPs composition towards high chlorine and low bromine. Regression analysis showed a strong linear relationship between η (Br) _ (THMs) and η (Br) _ (DHAAs) and ln (C1 / Br) with linear correlation coefficients (R ~ 2) of 0.961 and 0.991 . The calculated HBrO competes for DBPPs 90 and 80 times higher than that of HClO during the formation of THMs and DHAAs, respectively. At the same time, it was found that there was a strong linear relationship between the production of TTHMs and TDHAAs and ln (Cl / Br), the linear correlation coefficient (R ~ 2) was 0.968 and 0.904, respectively. Reducing the concentration of Br ~ The total has a positive meaning.