Abstract：
The Tibetan Plateau, a typical high-altitude area, is less affected by human activities such as industrial development, and the external pollution to water sources is extremely low. Then it is also an important source of water samples for exploring the molecular characteristics of precursors in the dissolved organic matter (DOM) of disinfection byproducts (DBPs) in drinking water. Research data on DBPs in drinking water on the Tibet Plateau remains insufficient, leading to uncertainty about DBP contamination in the area. This study explores the formation potential of 35 typical DBPs, including 6 trihalomethanes (THMs), 9 haloacetic acids (HAAs), 2 halogenated ketones (HKs), 9 nitrosamines (NAs), and 9 aromatic DBPs, during chlorination and chloramination of typical source water samples in the Tibet Plateau of China. Moreover, in order to further investigate the characteristics of the generation of DBPs, the molecular composition of DOM in the collected water samples was characterized by Fourier transform ion cyclotron resonance mass spectrometry. The findings reveal that, for chlorination and chloramination, the average concentration of the five classes of DBPs was ranked as follows (chlorination, chloramination): HAAs (268.1 μg/L, 54.2 μg/L) > THMs (44.0 μg/L, 2.0 μg/L) > HKs (0.7 μg/L, 1.8 μg/L) > NAs (26.5 ng/L, 74.6 ng/L) > Aromatics (20.4 ng/L, 19.5 ng/L). The dominant compounds in THMs, HAAs, and NAs are trichloromethane, dichloroacetic acid, trichloroacetic acid, and nitrosopyrrolidine, respectively. This study highlights a significant positive correlation between DBP generation and UV254, SUV254, and the double bond equivalents of DOM in the source water. It systematically elucidates DOM molecular composition characteristics and DBP formation potential in high-altitude water sources, shedding light on key factors influencing DBP generation at the molecular level in high-altitude areas.
摘要：
青藏高原,典型的高海拔地区,受工业发展等人类活动的影响较小，对水源的外部污染极低。然后，它也是探索饮用水中消毒副产物（DBPs）的溶解有机物（DOM）中前体分子特征的重要水样来源。关于青藏高原饮用水中DBPs的研究数据仍然不足，导致该地区DBP污染的不确定性。本研究探讨了35种典型DBPs的形成潜力，包括6个三卤甲烷（THM），9卤代乙酸（HAAs），2卤代酮（HKs），9亚硝胺（NAs），和9种芳香DBPs，在中国青藏高原典型水源水样的氯化和氯胺化过程中。此外，为了进一步研究DBPs的生成特征，利用傅里叶变换离子回旋共振质谱法对采集的水样中DOM的分子组成进行了表征。调查结果显示,用于氯化和氯胺化，五类DBPs的平均浓度排名如下(氯化，氯胺化）：HAAs（268.1μg/L，54.2μg/L）>THMs（44.0μg/L，2.0μg/L)>HKS(0.7μg/L，1.8μg/L）>NAs（26.5ng/L，74.6ng/L）>芳烃（20.4ng/L，19.5纳克/升)。THMs中的主要化合物，HAAs,NAs是三氯甲烷，二氯乙酸,三氯乙酸,和亚硝基吡咯烷,分别。这项研究强调了DBP的产生与源水中UV254，SUV254和DOM的双键当量之间的显着正相关。它系统地阐明了高海拔水源中DOM分子组成特征和DBP形成潜力，在分子水平上阐明了影响高海拔地区DBP生成的关键因素。
