Transfer Kinetics of Polar Organic Compounds over Polyethersulfone

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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