Monthly variations of unregulated brominated disinfection by-products in chlorinated water are correlated with total bromine  

作　　者：Christena Watts Jianxian Sun Paul D.Jones Hui Peng John P.Giesy 

机构地区：[1]Toxicology Centre,University of Saskatchewan,Saskatoon,SK S7N 5B3,Canada [2]School of Environment and Sustainability,University of Saskatchewan,Saskatoon,SK S7N 5C8,Canada [3]Department of Chemistry,University of Toronto,Toronto,ON M5S 3H6,Canada [4]Zoology Department,Institute for Integrative Toxicology,Michigan State University,East Lansing,MI 48824,USA [5]State Key Laboratory of Pollution Control and Resource Reuse,School of the Environment,Nanjing University,Nanjing 210023,China [6]Department of Veterinary Biomedical Sciences,University of Saskatchewan,Saskatoon,SK S7N 5B4,Canada [7]Department of Environmental Sciences,Baylor University,Waco,TX 76798-7266,USA

出　　处：《Eco-Environment & Health》2022年第3期147-155,共9页生态环境与健康（英文）

基　　金：supported by a Discovery Grant from the Natural Sciences and Engineering Research Council of Canada of Canada(Project#326415-07)and a grant from the Western Economic Diversification Canada(Projects#6578,6807,and 000012711).Prof.Giesy was supported by the Canada Research Chair program,and the 2014“High Level Foreign Experts”(#GDT20143200016)program funded by the State Administration of Foreign Experts Affairs,the P.R.China to Nanjing University,the Einstein Professor Program of the Chinese Academy of Sciences,and a Distinguished Visiting Professorship in the School of Biological Sciences of the University of Hong Kong.Prof.Peng was supported by a Discovery Grant from the Natural Sciences and Engineering Research Council of Canada of Canada(Project#RGPIN-2018-06511)and University of Toronto Start-up Funds.

摘　　要：Brominated disinfection by-products(Br-DBPs)can form during the chlorination of drinking water in treatment plants(DWTP).Regulations exist for a small subset of Br-DBPs;however,hundreds of unregulated Br-DBPs have been detected,and limited information exists on their occurrence,concentrations,and seasonal trends.Here,a data-independent precursor isolation and characteristic fragment(DIPIC-Frag)method were optimized to screen chlorinated waters for Br-DBPs.There were 553 Br-DBPs detected with m/z values ranging from 170.884 to 497.0278 and chromatographic retention times from 2.4 to 26.2 min.With MS2 information,structures for 40 of the 54 most abundant Br-DBPs were predicted.The method was then applied to a year-long study in which raw,clear well,and finished water were analyzed monthly.The 54 most abundant unregulated Br-DBPs were subjected to trend analysis.Br-DBPs with higher oxygen-to-carbon(O/C)and bromine-to-carbon(Br/C)ratios increased as water moved from the clear well to the finished stage,which indicated the dynamic formation of Br-DBPs.Monthly trends of unregulated Br-DBPs were compared to raw water parameters,such as natural organic matter,temperature,and total bromine,but no correlations were observed.It was found that total concentrations of bromine(TBr)in finished water(0.04–0.12 mg/L)were consistently and significantly greater than in raw water(0.013–0.038 mg/L,P<0.001),suggesting the introduction of bromine during the disinfection process.Concentrations of TBr in treatment units,rather than raw water,were significantly correlated to 34 of the Br-DBPs atα?0.05.This study provides the first evidence that monthly trends of unregulated Br-DBPs can be associated with the concentration of TBr in treated waters.

关 键 词：Natural organic matter BROMINE CHLORINATION Drinking water treatment High-resolution mass spectrometry 

分 类 号：X703[环境科学与工程—环境工程]