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Deiodination of iopamidol by zero valent iron (ZVI) enhances formation of iodinated disinfection by-products during chloramination
Dong, Huiyu; Qiang, Zhimin; Lian, Junfeng; Li, Jin; Yu, Jianwei; Qu, Jiuhui
2018-02-01
Source PublicationWATER RESEARCH
ISSN0043-1354
Volume129Pages:319-326
SubtypeArticle
AbstractIodinated X-ray contrast media (ICM) is considered as one of iodine sources for formation of toxic iodinated disinfection byproducts (I-DBPs) during disinfection. This study investigated transformation of a typical ICM, iopamidol (IPM) by zero valent iron (ZVI) and the effect of transformation on the formation of I-DBPs during chloramination. It was found that the presence of ZVI could deiodinate IPM into I- and the transformation of IPM exhibited a pseudo-first-order kinetics. Acidic circumstance, SO42-, Cl- and monochloramine could promote the transformation of IPM by ZVI, while SiO32- inhibited the transformation of IPM. Moreover, the transformation of IPM by ZVI changed both the formed species and amounts of I-DBPs during chloramination. During the chloramination of IPM-containing water, CHCl2I and iodoacetic acid were the predominant iodinated trihalomethanes (I-THMs) and iodinated haloacetic acids (I-HAAs), respectively in the absence of ZVI, while CHI3 and triiodoacetic acid became the predominant ones with 1.0 g L-1 ZVI. The addition of 5.0 g L-1 ZVI increased I-DBPs formation amounts by 6.0 folds after 72 h and maximum formation of I-DBPs occurred at pH 5.0. Enhanced I-DBPs formation was also observed with various real water sources. Given that ZVI ubiquitously exists in the unlined cast iron distribution pipes, the deiodination of IPM by ZVI during distribution may increase the formation of I-DBPs, which needs receive enough attention. (C) 2017 Elsevier Ltd. All rights reserved.
Department中国科学院饮用水科学与技术重点实验室
KeywordIodinated disinfection by-products Iopamidol ZVI Chloramination
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/41339
Collection中国科学院饮用水科学与技术重点实验室
Recommended Citation
GB/T 7714
Dong, Huiyu,Qiang, Zhimin,Lian, Junfeng,et al. Deiodination of iopamidol by zero valent iron (ZVI) enhances formation of iodinated disinfection by-products during chloramination[J]. WATER RESEARCH,2018,129:319-326.
APA Dong, Huiyu,Qiang, Zhimin,Lian, Junfeng,Li, Jin,Yu, Jianwei,&Qu, Jiuhui.(2018).Deiodination of iopamidol by zero valent iron (ZVI) enhances formation of iodinated disinfection by-products during chloramination.WATER RESEARCH,129,319-326.
MLA Dong, Huiyu,et al."Deiodination of iopamidol by zero valent iron (ZVI) enhances formation of iodinated disinfection by-products during chloramination".WATER RESEARCH 129(2018):319-326.
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