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Decomposition of trihaloacetic acids and formation of the corresponding trihalomethanes in drinking water
Abstract
The decomposition of trihaloacetic acids [bromodichloroacetic acid (BDCAA), dibromochloroacetic acid (DBCAA), tribromoacetic acid (TBAA)], and the formation of the corresponding trihalomethanes [bromodichloromethane (BDCM), dibromochloromethane (DBCM), tribromomethane (TBM)] were studied. Like TBAA, the two mixed chlorobromo-species, BDCAA and DBCAA, were found to decompose to form BDCM and DBCM, respectively, via a decarboxylation pathway. The decomposition of BDCAA, DBCAA and TBAA in water at neutral pH follows a first-order reaction, with rate constants of 0.0011, 0.0062 and 0.040 day(-1) at 23 degrees C, respectively; and 0.000028, 0.00014 and 0.0016 day(-1) at 4 degrees C, respectively. The activation energies for the decomposition reaction of BDCAA, DBCAA and TBAA in water at neutral pH were found to be 35.0, 34.5 and 29.2 kcal/mol, respectively. The effect of pH in the range of 6-9 and the effect of a drinking water matrix on the decomposition of BDCAA, DBCAA, and TBAA in water were found to be insignificant. Measurement and health implications due to decomposition of trihaloacetic acids and formation of the corresponding trihalomethanes were discussed. By applying the technique of quantitative structure-activity relationships (QSAR), the decomposition rate constants of six iodinated trihaloacetic acids were estimated.
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“Zhang and Minear (2002) found the temperature-dependent decomposition of T-HAAs produce the corresponding THMs via decarboxylation.”
From Regulation, formation, exposure, and treatment of disinfection by-products (DBPs) in swimming pool waters: A critical review (2018) · cites this paper as Zhang and Minear (2002)
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Metadata
- Authors
- Zhang, X., & Minear, R. A.
- Affiliations
- University of Illinois Urbana-Champaign (US)
- Corresponding author
- Zhang, Xiangru
- ORCID
- Zhang, Xiangru
- Venue
- Water Research
- Publisher
- Elsevier BV
- Published
- 2002-08
- Volume
- 36
- Issue
- 14
- Pages
- 3665-3673
- ISSN
- 0043-1354 (ISSN-L)
- OpenAlex
- W2038172277
- Cited by
- 195
- References
- 0
- Citations by year
- 2026: 4 · 2025: 12 · 2024: 9 · 2023: 10 · 2022: 13 · 2021: 14 · 2020: 11 · 2019: 10 · 2018: 13 · 2017: 10 · 2016: 6 · 2015: 10 · 2014: 10 · 2013: 9 · 2012: 9
- FWCI
- 2.56
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Water Research (publishedVersion)
- PubMed (publishedVersion)
- Rare & Special e-Zone (The Hong Kong University of Science and Technology) (submittedVersion)
- Funders
- U.S. Environmental Protection Agency
- American Water Works Association Research Foundation
- Topics
- Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Water Treatment and Disinfection
- Physical Sciences › Environmental Science › Water Science and Technology › Advanced oxidation water treatment
- Physical Sciences › Environmental Science › Water Science and Technology › Water Quality and Resources Studies
- Keywords
- trihaloacetic acids, trihalomethanes, tribromoacetic acid, bromodichloromethane, dibromochloromethane, bromoform, decarboxylation, decomposition kinetics, activation energy, drinking water disinfection by-products, QSAR, health implications
- MeSH terms
- Acetates, Disinfectants, Hydrogen-Ion Concentration, Structure-Activity Relationship, Water, Water Supply
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