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Formation of iodo-trihalomethanes, iodo-acetic acids, and iodo-acetamides during chloramination of iodide-containing waters: Factors influencing formation and reaction pathways.
J Hazard Mater. 2017 Jan 05; 321:28-36.JH

Abstract

This study investigated systematically the factors influencing the formation of iodinated disinfection by-products (I-DBPs) during chloramination of I--containing waters, including reaction time, NH2Cl dose, I- concentration, pH, natural organic matter (NOM) concentration, Br-/I- molar ratio, and water matrix. Among the I-DBPs detected, iodoform (CHI3), iodoacetic acid (IAA), diiodoacetic acid (DIAA), triiodoacetic acid (TIAA), and diiodoacetamide (DIAcAm) were the major species produced from reactions between reactive iodine species (HOI/I2) and NOM. A kinetic model involving the reactions of NH2Cl auto-decomposition, iodine species transformation and NOM consumption was developed, which could well describe NH2Cl decay and HOI/I2 evolution. Higher concentrations of CHI3, IAA, DIAA, TIAA, and DIAcAm were observed in chloramination than in chlorination, whereas IO3- was only formed significantly in chlorination. Maximum formation of I-DBPs occurred at pH 8.0, but acidic conditions favored the formation of iodinated haloacetic acids and DIAcAm. Increasing Br-/I- molar ratio from 1 to 10 did not increase the total amount of I-DBPs, but produced more bromine-substituting species. In addition, chloramination of 18 model compounds indicated that low-SUVA254 (specific ultraviolet absorbance at 254nm) NOM generally favored the formation of I-DBPs compared to high-SUVA254 NOM. Finally, potential pathways for I-DBPs formation from chloramination of NOM were proposed.

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Authors+Show Affiliations

Liu S
Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 18 Shuang-qing Road, Beijing, 100085, China; Guangxi Colleges and Universities Key Laboratory of Food Safety and Pharmaceutical Analytical Chemistry, Guangxi Key Laboratory of Chemistry and Engineering of Forest Products, School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning, 530006, Guangxi, China.
Li Z
Guangxi Colleges and Universities Key Laboratory of Food Safety and Pharmaceutical Analytical Chemistry, Guangxi Key Laboratory of Chemistry and Engineering of Forest Products, School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning, 530006, Guangxi, China.
Dong H
Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 18 Shuang-qing Road, Beijing, 100085, China.
Goodman BA
College of Physical Science and Engineering, State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning, 520004, Guangxi, China.
Qiang Z
Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 18 Shuang-qing Road, Beijing, 100085, China. Electronic address: qiangz@rcees.ac.cn.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

27607930

Citation

Liu, Shaogang, et al. "Formation of Iodo-trihalomethanes, Iodo-acetic Acids, and Iodo-acetamides During Chloramination of Iodide-containing Waters: Factors Influencing Formation and Reaction Pathways." Journal of Hazardous Materials, vol. 321, 2017, pp. 28-36.
Liu S, Li Z, Dong H, et al. Formation of iodo-trihalomethanes, iodo-acetic acids, and iodo-acetamides during chloramination of iodide-containing waters: Factors influencing formation and reaction pathways. J Hazard Mater. 2017;321:28-36.
Liu, S., Li, Z., Dong, H., Goodman, B. A., & Qiang, Z. (2017). Formation of iodo-trihalomethanes, iodo-acetic acids, and iodo-acetamides during chloramination of iodide-containing waters: Factors influencing formation and reaction pathways. Journal of Hazardous Materials, 321, 28-36. https://doi.org/10.1016/j.jhazmat.2016.08.071
Liu S, et al. Formation of Iodo-trihalomethanes, Iodo-acetic Acids, and Iodo-acetamides During Chloramination of Iodide-containing Waters: Factors Influencing Formation and Reaction Pathways. J Hazard Mater. 2017 Jan 5;321:28-36. PubMed PMID: 27607930.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Formation of iodo-trihalomethanes, iodo-acetic acids, and iodo-acetamides during chloramination of iodide-containing waters: Factors influencing formation and reaction pathways. AU - Liu,Shaogang, AU - Li,Zhenlin, AU - Dong,Huiyu, AU - Goodman,Bernard A, AU - Qiang,Zhimin, Y1 - 2016/08/30/ PY - 2016/06/03/received PY - 2016/08/27/revised PY - 2016/08/29/accepted PY - 2016/9/9/pubmed PY - 2016/9/9/medline PY - 2016/9/9/entrez KW - Influential factors KW - Iodinated disinfection by-products (I-DBPs) KW - Monochloramine (NH(2)Cl) KW - Natural organic matter (NOM) KW - Pathways SP - 28 EP - 36 JF - Journal of hazardous materials JO - J Hazard Mater VL - 321 N2 - This study investigated systematically the factors influencing the formation of iodinated disinfection by-products (I-DBPs) during chloramination of I--containing waters, including reaction time, NH2Cl dose, I- concentration, pH, natural organic matter (NOM) concentration, Br-/I- molar ratio, and water matrix. Among the I-DBPs detected, iodoform (CHI3), iodoacetic acid (IAA), diiodoacetic acid (DIAA), triiodoacetic acid (TIAA), and diiodoacetamide (DIAcAm) were the major species produced from reactions between reactive iodine species (HOI/I2) and NOM. A kinetic model involving the reactions of NH2Cl auto-decomposition, iodine species transformation and NOM consumption was developed, which could well describe NH2Cl decay and HOI/I2 evolution. Higher concentrations of CHI3, IAA, DIAA, TIAA, and DIAcAm were observed in chloramination than in chlorination, whereas IO3- was only formed significantly in chlorination. Maximum formation of I-DBPs occurred at pH 8.0, but acidic conditions favored the formation of iodinated haloacetic acids and DIAcAm. Increasing Br-/I- molar ratio from 1 to 10 did not increase the total amount of I-DBPs, but produced more bromine-substituting species. In addition, chloramination of 18 model compounds indicated that low-SUVA254 (specific ultraviolet absorbance at 254nm) NOM generally favored the formation of I-DBPs compared to high-SUVA254 NOM. Finally, potential pathways for I-DBPs formation from chloramination of NOM were proposed. SN - 1873-3336 UR - https://www.unboundmedicine.com/medline/citation/27607930/Formation_of_iodo_trihalomethanes_iodo_acetic_acids_and_iodo_acetamides_during_chloramination_of_iodide_containing_waters:_Factors_influencing_formation_and_reaction_pathways_ DB - PRIME DP - Unbound Medicine ER -