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N-Nitrosamine formation from chloramination of two common ionic liquids

journal of Environmental Sciences 2020年第1期32卷 341-348页

作者： ian j.vander meulen Ping jiang Di Wu Steve E.Hrudey Xing-Fang Li Division of Analytical and Environmental Toxicology Department of Laboratory Medicine and PathologyFaculty of Medicine and DentistryUniversity of Alberta

Ionic liquids(ILs)are a class of solvents increasingly used as"green chemicals."Widespread applications of ILs have led to concerns about their accidental entry to the *** have been assessed for some environmental impacts;however,little has been done to characterize their potential impacts on drinking water if ILs accidentally enter surface *** cations are often aromatic or alkyl quaternary amines that resemble structures of previously confirmed N-nitrosamine(NA)***,this study has evaluated two common ILs,1-ethyl-3-methylimidazolium bromide(EMIm Br)and 1-ethyl-1-methylpyrrolidinium bromide(EMPyr Br),for their NA formation *** IL species was reacted with pre-formed monochloramine under various laboratory *** reaction mixtures were extracted using liquid–liquid extraction and analyzed for NAs using high performance liquid chromatography tandem mass *** low concentration of IL(250μmol/L),the yields of NAs(NMEA or NPyr)increased with increasing doses of monochloramine from both IL *** total NA yield was as high as 2.5±0.3 ng/mg from EMIm Br,and as high as 8.6±0.8 ng/mg from EMPyr *** high concentration of IL(5 mmol/L),the NA yield reached a maximum at 2.5 mmol/L NH2Cl,and then decreased with subsequent increases in the reactant concentrations,demonstrating ILs’solvent *** study re-emphasizes the importance of preventing discharge of ILs to water bodies to prevent secondary impacts on drinking water.

关键词： Ionic liquids N-nitrosamine Liquid–liquid extraction HPLC–MS/MS DBPs

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