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DOI	10.1016/j.cej.2024.151760
	Unveiling distinct influencing mechanisms of Br- on NDMA formation during ozonation of actual water Matrixes: Identification of precursors and brominated substance
	Gao, Menglan; Liao, Xiaobin; Chen, Shuting; Li, Xiaoying; Zhang, Yirou; Chen, Chao; Qi, Huan
发表日期	2024
ISSN	1385-8947
EISSN	1873-3212
起始页码	490
卷号	490
英文摘要	Bromide ion (Br - ) in water sources has been found to affect the formation of carcinogenic non-brominated Nnitrosodimethylamine (NDMA) during ozonation of typical amines. The increasing bromide levels bring more concern due to climate change and industrial discharge, but its effects on actual water matrixes were still unclear. In this study, NDMA formation from three actual water matrixes during ozonation as the Br - concentration increased from 0 to 100 mu M were investigated (promotion (100.4 - 231.6 ng/L), promotion then inhibition (399.5 - 461.2 - 428.2 ng/L), and subtle influence (51.9 +/- 6.9 ng/L)); from which the NDMA precursors were screened and 8 precursors were selected for exploring the influencing mechanisms. The results indicated that the roles of Br - on NDMA formation significantly depended on the water characteristics of actual matrixes. A total of 16 typical NDMA precursors, which were mainly derived from industrial, agricultural and pharmaceutical sources, were identified. Moreover, 6 brominated substance (Br -DMA, Br-UDMH, Br-DMSC, Br-DMS, Br-TMDS, Br 2 -TMDS), which were thought to play a crucial role in promoting NDMA formation, were also identified in actual water by precursor ion scan (PIS) method. Hypobromous acid (HOBr), which has been proved to be the culprit to the generation of brominated substances, tend to attack the electron -donating groups of amines, such as acylamino (-NHCO-R) or amidogen (-NH 2 ) groups. However, the reactive bromine species ( center dot Br and center dot Br 2 - ) was inclined to attack the aromatic and anti -oxidant moieties then result in Br - release, as no bromine substitution but free radical transfer reaction occurs. Therefore, decreasing HOBr formation is the crucial step to reduce NDMA generation. This work would provide technical guide for NDMA risks control during ozonation of Br - -amines cocontaining water matrixes.
英文关键词	Bromide; Ozonation; NDMA; Precursors; Brominated substances
语种	英语
WOS研究方向	Engineering
WOS类目	Engineering, Environmental ; Engineering, Chemical
WOS记录号	WOS:001239225400002
来源期刊	CHEMICAL ENGINEERING JOURNAL
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/303699
作者单位	Huaqiao University; Quanzhou Normal University; Tsinghua University
推荐引用方式 GB/T 7714	Gao, Menglan,Liao, Xiaobin,Chen, Shuting,et al. Unveiling distinct influencing mechanisms of Br- on NDMA formation during ozonation of actual water Matrixes: Identification of precursors and brominated substance[J],2024,490.
APA	Gao, Menglan.,Liao, Xiaobin.,Chen, Shuting.,Li, Xiaoying.,Zhang, Yirou.,...&Qi, Huan.(2024).Unveiling distinct influencing mechanisms of Br- on NDMA formation during ozonation of actual water Matrixes: Identification of precursors and brominated substance.CHEMICAL ENGINEERING JOURNAL,490.
MLA	Gao, Menglan,et al."Unveiling distinct influencing mechanisms of Br- on NDMA formation during ozonation of actual water Matrixes: Identification of precursors and brominated substance".CHEMICAL ENGINEERING JOURNAL 490(2024).