Li Huan, Li Zheng-Kui, Li Ai-Min, Zhou Qing, Wang Ying, Pan Yang
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China.
Huan Jing Ke Xue. 2017 Aug 8;38(8):3273-3280. doi: 10.13227/j.hjkx.201612221.
Recently, 13 new phenolic halogenated disinfection by-products (DBPs) have been reported in chlorinated drinking water and have been classified into four groups: dihalo-4-hydroxybenzaldehydes, dihalo-4-hydroxybenzoic acid, dihalo-salicylic acids, and trihalo-phenols. In this work, the four fully brominated species (3,5-dibromo-4-hydroxybenzoic acid, 3,5-dibromosalicylic acid, 2,4,6-tribromophenol, and 3,5-dibromo-4-hydroxybenzaldehyde) were selected as representatives, and the decomposition mechanism of these new DBPs during chlorination was studied with the aid of ultra performance liquid chromatography/electrospray ionization triple-quadrupole mass spectrometry (precursor ion scan, multiple reaction monitoring, and product ion scan). Except for 3,5-dibromosalicylic acid, the new DBPs were not stable and could be finally decomposed to haloacetic acids through multistep substitution, hydrolysis, and oxidation. Various decomposition intermediate DBPs were detected, including a new group of halogenated DBPs with cyclic structures (trihalo-hydroxyl-cyclopetene-diones).
最近，在氯化饮用水中已报道了13种新的酚类卤代消毒副产物（DBPs），并被分为四组：二卤代-4-羟基苯甲醛、二卤代-4-羟基苯甲酸、二卤代水杨酸和三卤代酚。在本研究中，选择了四种全溴化物种（3,5-二溴-4-羟基苯甲酸、3,5-二溴水杨酸、2,4,6-三溴酚和3,5-二溴-4-羟基苯甲醛）作为代表，并借助超高效液相色谱/电喷雾电离三重四极杆质谱（前体离子扫描、多反应监测和产物离子扫描）研究了这些新型DBPs在氯化过程中的分解机制。除3,5-二溴水杨酸外，新型DBPs不稳定，最终可通过多步取代、水解和氧化分解为卤乙酸。检测到了各种分解中间DBPs，包括一组新的具有环状结构的卤代DBPs（三卤代-羟基-环戊烯-二酮）。
