资源描述:
《Transfer Kinetics of Polar Organic Compounds over Polyethersulfone》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、Articlepubs.acs.org/estTransferKineticsofPolarOrganicCompoundsoverPolyethersulfoneMembranesinthePassiveSamplersPocisandChemcatcher,∥,†††,‡†EtienneL.M.Vermeirssen,̈*ConradDietschweiler,BeateI.Escher,JürgenvanderVoet,†,§andJulianeHollender†Eawag,SwissFederalInstituteofAquaticScienceandTechnology,
2、Überlandstrasse133,8600Dübendorf,Switzerland‡NationalResearchCentreforEnvironmentalToxicology(Entox),TheUniversityofQueensland,39KesselsRoad,Brisbane,QLD4108,Australia§InstituteofBiogeochemistryandPollutantDynamics,ETHZürich,8092Zürich,Switzerland*SSupportingInformationABSTRACT:Passivesample
3、rsforpolarorganiccompoundsoftenuseapolyethersulfone(PES)membranetoretaintheparticulatesorbentmaterial(e.g.,inaPOCIS;polarorganicchemicalintegrativesampler)ortoreducethesamplingrateandthusextendthekineticregime(e.g.,inaChemcatcher).ThetransportkineticsoverthePESmembraneareevaluatedhereinashort-te
4、rm(6days)andalong-term(32days)experimentwithPOCISandChemcatchers.Passivesamplerswereplacedinachannelwithflowingriverwaterthatwasspikedwith22organicchemicalsincludingpharmaceuticals,pesticidesandbiocides;withlogKow(logarithmicoctanol−waterpartitioningcoefficient)valuesbetween−2.6and3.8.Samplerswerer
5、emovedatintervalsandmembranesandsorbentmaterialwereextractedandanalyzedwithLC-MS/MS.Uptakekineticsofthecompoundsfellbetweentwoextremes:(1)chargedchemicalsandchemicalsoflowhydrophobicitydidnotaccumulateinPESandrapidlytransferredtothesorbent(e.g.,diclofenac)and(2)morehydrophobicchemicalsaccumulate
6、dstronglyinthePESandappearedinthesorbentafteralag-phase(e.g.,diazinonanddiuron).Sorptionkineticsweremodeledwithathree-compartmentfirst-orderkineticmodeltodetermineuptakeandeliminationrateconstantsandpartitioningcoefficients.WaterPESpartitioningcoefficientsfittedwiththemodelcorrelatedwellwithexperiment
7、allydeterminedvaluesandlogKow.SamplingratesofChemcatcher(0.02−0.10L/d)andPOCIS(0.02−0.30L/d)showedsimilarpatternsandcorrelatedwell.Thusthesamplersareinterchangeableinpracticalapplications.Longerlag-phasesmayposeproblemswhenc