DBPs in natural water in Hong Kong after COVID-19 pilot study of pollution characteristics and ecological risk of disinfection by-products in natural waters in Hong Kong

Jing LIU, Li-Xin HU, Wenjing DENG, Guang-Guo YING, Huachang HONG, Po Keung Eric TSANG, Damià BARCELÓ

Research output: Contribution to journalArticlespeer-review

Abstract

Increased disinfection efforts in various parts of China, including Hong Kong, to prevent the spread of the novel coronavirus may lead to elevated concentrations of disinfectants in domestic sewage and surface runoff in Hong Kong, generating large quantities of toxic disinfection by-products (DBPs). This study investigated the presence and distribution of four trihalomethanes (THMs), six haloacetic acids (HAAs) and eight nitrosamines (NAMs) in rivers and seawater in Hong Kong. The concentrations of THMs (mean concentration: 1.6 µg/L [seawater], 3.0 µg/L [river water]), HAAs (mean concentration: 1.4 µg/L [seawater], 1.9 µg/L [river water]) and NAMs (mean concentration: 4.4 ng/L [seawater], 5.6 ng/L [river water]) did not significantly differ between river water and seawater. The total DBP content in river water in Hong Kong was similar to that in Wuhan and Beijing, and the total THM concentration in seawater was significantly higher than that before the COVID-19 pandemic. Among the regulated DBPs, none of the surface water samples exceeded the maximum index values for THM4 (80 μg/L), HAA5 (60 μg/L) and nitrosodimethylamine (100 ng/L) in drinking water. Among the DBPs detected, bromoform in rivers and seawater poses the highest risk to aquatic organisms, which warrants attention and mitigation efforts. Copyright © 2022 SETAC.
Original languageEnglish
Pages (from-to)2613-2621
JournalEnvironmental Toxicology and Chemistry
Volume41
Issue number10
Early online date13 Sep 2022
DOIs
Publication statusPublished - Oct 2022

Citation

Liu, J., Hu, L.-X., Deng, W.-J., Ying, G.-G., Hong, H., Tsang, E. P. K., & Barceló, D. (2022). DBPs in natural water in Hong Kong after COVID-19 pilot study of pollution characteristics and ecological risk of disinfection by-products in natural waters in Hong Kong. Environmental Toxicology and Chemistry, 41(10), 2613-2621. doi: 10.1002/etc.5449

Keywords

  • Disinfect ion by-products
  • Surface water
  • Ecological risk

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