差分光谱的NOM氯化反应的显示

差分光谱的NOM氯化反应的显示ExaminationofNOMChlorinationReactionsbyConventionalandStop-FlowDifferentialAbsorbanceSpectroscopyGREGORYV.KORSHIN,*,†MARKM.BENJAMIN,†HYUN-SHIKCHANG,†ANDHERVEÄGALLARD†DepartmentofCivilandEnvironmentalEngineering,UniversityofWashington,Box352700Seattle,Washington98195-2700,andLaboratoiredeChimiedel’Eauetdel’Environnement,Universite´dePoitiers,40AvenueduRecteurPineau,Poitiers,France86022Mechanismsofchlorinationofnaturalorganicmatter(NOM)insurfacewater(LakeWashington)wereexploredviadifferentialspectroscopy.Twotypesofdifferentialspectra(overallandincremental)weregeneratedforthiswaterchlorinatedatpH7usingvaryingchlorinedosesandreactiontimes.Thedifferentialspectracontaintwokineticallyandspectroscopicallydistinctcomponents.Oneofthesecomponentsisattributabletofunctionalgroupsthatreactrapidlywithchlorine,whiletheotherreflectstransformationsofslowlyreactingchromophoresthatarisefollowingthedepletionofthefastchromophores.Smallconcentrationsofdisinfectionbyproducts(DBPs),exemplifiedin