臭氧对水中甲基对硫磷的降解

31220096()JournalofHubeiUniversity(NaturalScience)Vol.31No.2Jun.,2009:2008211213:2(A2PD94)(07300488):(19752),,,;,,Email:[e-mail]:100022375(2009)02201972041,CHANY.S.Gilbert2,3(1.,510515;2.,;3./,510275):,.,GC2MS,HPLC.,,.50mmol/L60%,pH.GC/MS,.pH,pH,.:;;;:X592:ADOI:10.3969/j.issn.100022375.2009.02.022,.,,..,[122].2,42D[325].,,[6]..,.,pH,.11.1(methylparathion,CAS#2982020,99.9%)(methylparaoxon,CAS#95023526,99.0%)Supelco.Sigma.(tert2butylalcohol,TBA)KH2PO4.1.2250mL,9902B(PoSengozonior)(0.4mgL-1).25min,50mL250mL,100mL,,RE22000()2mL,,0.5mL,2198()31(GC2MS).1.34:(1);(2)(102030mgL-1);(3)pH(2.053.455.297.95);(4)50mmol/LTBA.01235810152030min,5mL,Na2SO3,.HPLC().1.4GC2MS689025973N(AgilentTechnologies,).HP52MS(30m0.25mm0.25m,AgilentTechnologies,),1L.,1mLmin-1.230,270,280.:120,1min,10min-1265,5min.1.5HPLC()508(HPLC)(Beckman,).C18(15cm4.6mm,5m)(Discovery,),AKH2PO4(36mmol/L)B,0.8mLmin-1,0.1minB0.2min65%72%,5.5min1minB80%,9minB1min65%,15min.UV220nm,100L.0.025-40mgL-1.22.1,GC2MS(1),(99%),,,.2.22.pH5.29,,.30min,102030mgL-194%89%75%,,.,,.12(pH5.29)2.3pH[728].,:-ln[c]/[c]0=kt.[c],[c]0,k,t.pH(1).1pH.pH[328].2:1991pHpHk/(min-1)R2.050.09490.9403.450.09320.9805.290.10070.9907.950.11850.9992TBA(pH5.29)k/(min-1)RTBA0.10070.99050mmol/LTBA0.042340.9862.4TBA,50mmol/LTBA[9].2,50mmol/LTBA,TBA0.1007min-10.04234min-1,60%.,[6].,,[10];,N2[11];,2,42D[4].,TBA,60%,.2.53,pH.30min,pHpH,pH.,pH.4.,.TBA(5).3pH45TBACO2,[6,10].,pH,pH,,(34),(5).345,30min,,11%(20mgL-1,2.24mgL-1),,.,,[12213].,[2].3,.pH,50mmol/LTAB60%.,,pH,pH,,.30min,.200()31:[1]GromadzkaK,SwietlikJ.Organicmicropollutantsdegradationinozone2loadedsystemwithperfluorinatedsolvent[J].WaterResearch,2007,41(12):257222580.[2]WuJ,LinL,LuanT,etal.Effectsoforganophosphoruspesticidesandtheirozonationbyproductsongapjunctionalintercellularcommunicationinratlivercellline[J].FoodandChemicalToxicology,2007,45:205722063.[3]KuY,LinHS.Decompositionofphorateinaqueoussolutionbyphotolyticozonation[J].WaterResearch,2002,36:415524159.[4]ChuW,ChingMH.Modelingtheozonationof2,42dichlorophoxyaceticacidthroughakineticapproach[J].WaterResearch,2003,37:39246.[5]ChenWR,SharplessC,LindenKG,etal.Treatmentofvolatileorganicchemicals(VOLs)ontheEPAcontaminantcandidatelistusingozonation[C].LasVegas:InternationalOzoneAssociation16thWorldCongress,2003:2422260.[6]GottschalkC,LibraJA,SaupeA.Ozonationofwaterandwastewaterapracticalguidetounderstandingozoneanditsapplication[M].Weiheim(FederalRepublicofGermany):WILEY2VCH,2000:11219.[7]IkehataK,GamalEl2DinM.Aqueouspesticidedegradationbyozonationandozone2basedadvancedoxidationprocesses:areview[J].Ozone:ScienceandEngineering,2005,27(2):832114.[8]IkehataK,GamalEl2DinM.Aqueouspesticidedegradationbyozonationandozone2basedadvancedoxidationprocesses:areview[J].Ozone:ScienceandEngineering,2005,27(3):1732202.[9]StaehelinJ,HoignJ.Decompositionofozoneinwaterinthepresenceoforganicsolutesactingaspromotersandinhibitorsofradicalchainreactions[J].EnvironmentalScienceandTechnology,1985,19:120621213.[10]KimJY,MoonSH.Akineticstudyonoxidationofpentachlorophenolbyozone[J].JournalofTheAir&WasteManagementAssociation,2000,50(4):5552562.[11]LeeC,YoonJ,vonGuntenU.OxidativedegradationofN2nitrosodimethyl2aminebyconventionalozonationandtheadvancedoxidationprocessozone/hydrogenperoxide[J].WaterResearch,2007,41(3):5812590.[12]KimBS,FujitaH,SakaiY,etal.Catalyticozonationofanorganophosphoruspesticideusingmicroporoussilicateanditseffectontotaltoxicityreduction[J].WaterScienceandTechnology,2002,46(425):35241.[13]MastenSJ,TianM,UphamBL,etal.Effectofselectedpesticidesandtheirozonationby2productsongapjunctionalintercellularcommunicationusingrateliverepithelialcelllines[J].Chemosphere,2001,44:4572465.DegradationofmethylparathioninwaterbyozonationWUJi2guo1,CHANY.S.Gilbert2,LINLi3(1.SchoolofPublicHealthandTropicalMedicine,SouthernMedicalUniversity,Guangzhou510515,China;2.DepartmentofAppliedBiologyandChemicalTechnology,TheHongKongPolytechnicUniversity,HongKong,China3.SchoolofLifeScience/StateKeyLaboratoryofBiocontrol,SunYat2senUniversity,Guangzhou510275,China;)Abstract:Ozonationofmethylparathionwasinvestigatedtounderstandthedegradationmechanismandinfluencingfactors.Methylparathionwasoxidizedbybubblingozonegasintoacylindricalglassreactor.OxidationintermediateofmethylparathionwasqualitativelyidentifiedbyGC/MS,andcontentsofmethylparathionresidueandintermediateweredetectedbyHPLC.Degradationofmethylparathionbyozonefollowedthepseudo2first2orderreactionthroughozonedirectoxidationandhydroxylradicalindirectoxidation.Scavengertert2butylalcohol(TBA)(50mmol/L)significantlydecreasedthedegradationrateconstantofmethylparathion(60%),whilesolutionpHaffectedthedegradationinsignificantly.Methylparaoxonwasidentifiedasozonationintermediateofmethylparathion.FormationofmethylparaoxonfavoredlowsolutionpHandhighinitialconcentrationofmethylparathion,butbeinsignificantlyinfluencedbyTBAduringozonation.Keywords:methylparathion;methylparaoxon;ozone;degradation()