| Precursors of dichloroacetamide, an emerging nitrogenous DBP formed during chlorination or chloramination. | |
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MedLine Citation:
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PMID: 20397690 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Haloacetamides (HAcAms) are an emerging class of nitrogenous disinfection byproducts (N-DBPs). However, there is a limited understanding about the precursors of HAcAms. In this study, we screened the precursors of dichloroacetamide (DCAcAm), the most commonly identified HAcAm in chlorinated or chloraminated drinking water. DCAcAm formation potential (FP) of raw water samples collected in different months from a reservoir in China was determined during chlorination, and the highest DCAcAm FP typically occurred in the summer samples. Dissolved organic matter (DOM) in a representative summer raw water sample was separated into six fractions by a series of resin elutions. Among them, hydrophilic acid (HiA) DOM showed the maximum DCAcAm FP, followed by hydrophilic bases (HiB) and, to a much lower extent, hydrophobic acids (HoA). Fluorescence excitation-emission matrix (EEM) spectra revealed that a mass of protein-like substances in the HiA fraction, made up of amino acids (AAs), were the likely DCAcAm precursors. Finally, we investigated the DCAcAm yields of 20 AAs during chlorination. Among them, seven AAs (aspartic acid, histidine, tyrosine, tryptophan, glutamine, asparagine, phenylalanine) could form DCAcAm during chlorination, with the corresponding DCAcAm yields of 0.231, 0.189, 0.153, 0.104, 0.078, 0.058, and 0.050 mmol/mol AA. |
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Authors:
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Wen-Hai Chu; Nai-Yun Gao; Yang Deng; Stuart W Krasner |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Environmental science & technology Volume: 44 ISSN: 0013-936X ISO Abbreviation: Environ. Sci. Technol. Publication Date: 2010 May |
Date Detail:
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Created Date: 2010-05-13 Completed Date: 2010-07-08 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0213155 Medline TA: Environ Sci Technol Country: United States |
Other Details:
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Languages: eng Pagination: 3908-12 Citation Subset: IM |
Affiliation:
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State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Acetamides
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chemistry* Chlorine / chemistry* Disinfectants / chemistry* Nitrogen / chemistry* |
| Chemical | |
Reg. No./Substance:
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0/Acetamides; 0/Disinfectants; 683-72-7/2,2-dichloroacetamide; 7727-37-9/Nitrogen; 7782-50-5/Chlorine |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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