AI Article Synopsis
- - The Tibetan Plateau, with minimal human impact and low pollution, serves as an ideal location for studying the characteristics of dissolved organic matter (DOM) in relation to disinfection byproducts (DBPs) in drinking water.
- - This study examines the formation potential of 35 typical DBPs during chlorination and chloramination of source water, revealing that haloacetic acids (HAAs) have the highest average concentration compared to other DBP classes.
- - The research identifies significant correlations between DBP generation and certain properties of DOM, enhancing understanding of the molecular composition and factors influencing DBP formation in high-altitude water sources.
Article 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 UV, SUV, 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.
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| http://dx.doi.org/10.1016/j.scitotenv.2024.174628 | DOI Listing |
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