| 11 | Monthly variations of unregulated brominated disinfection by-products in chlorinated water are correlated with total bromine显示文摘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. | Christena Watts Jianxian Sun Paul D.Jones Hui Peng John P.Giesy | 2022 | Eco-Environment & Health2022，1，3： | 0 |
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