Identification of unknown disinfection byproducts in drinking water produced from Taihu Lake source water

• 作者: Jiabao Li Haifeng Zhang Juan Wang Zhiyong Yu Hongyan Li Min Yang
• 来源期刊: 环境科学学报（英文版）
• 年，卷（期）: 2022,（3）
• 页码范围: 1-11
• 页数: 11页
• 语种: 英文

摘要

Although disinfection byproducts (DBPs) in drinking water have been suggested as a can-cer causing factor,the causative compounds have not yet been clarified.In this study,we used liquid chromatography quadrupole-time-of-flight spectrometry (LC-QTOF MS) to iden-tify the unknown disinfection byproducts (DBPs) in drinking water produced from Taihu Lake source water,which is known as a convergence point for the anthropogenic pollutants discharged from intensive industrial activities in the surrounding regions.In total,91 for-mulas of DBPs were discovered through LC-QTOF MS nontarget screen,81 of which have not yet been reported.Among the 91 molecules,56 only contain bromine,15 only contain chlorine and 20 DBPs have both bromine and chlorine atoms.Finally,five DBPs including 2,4,6-tribromophenol,2,6-dibromo-4-chlorophenol,2,6-dichloro-4-bromophenol,4-bromo-2,6-di-tert-butylphenol and 3,6-dibromocarbazole were confirmed using standards.The for-mer three compounds mainly formed in the predisinfection step (maximum concentration,0.2-2.6 μg/L),while the latter two formed in the disinfection step (maximum concentration,18.2-33.6 ng/L).In addition,19 possible precursors of the discovered DBPs were detected,with the aromatic compounds being a major group.2,6-di-tert-butylphenol as the precur-sor of 4-bromo-2,6-di-tert-butylphenol was confirmed with standard,with a concentration of 20.3 μg/L in raw water.The results of this study show that brominated DBPs which are pos-sibly formed from industrial pollutants are relevant DBP species in drinking water produced form Taihu source water,suggesting protection of Taihu Lake source water is important to control the DBP risks.