【英文标准名称】:StandardTestMethodforDeterminationofParentandAlkylPolycyclicAromaticsinSedimentPoreWaterUsingSolid-PhaseMicroextractionandGasChromatography/MassSpectrometryinSelectedIonMonitoringMode
【原文标准名称】:在选定的离子监控模式下用固相微萃取法和气相色谱/质谱法测定沉积物孔隙水中母体芳烃和烷基多环芳烃的标准试验方法
【标准号】:ASTMD7363-2007
【标准状态】:现行
【国别】:
【发布日期】:2007
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D19.06
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:烷基;芳香的;芳香族化合物;化学特性;测定;气相色谱法;离子;质谱学;监控;孔隙;断面图;沉积物;土壤普查;固相微萃取法;测试;水
【英文主题词】:
【摘要】:ThismethoddirectlydeterminestheconcentrationsofdissolvedPAHconcentrationsinenvironmentalsedimentporewatersamples.ThemethodisimportantfromanenvironmentalregulatoryperspectivebecauseitcanachievetheanalyticalsensitivitiestomeetthegoalsoftheUSEPAnarcosismodelforprotectingbenthicorganismsinPAHcontaminatedsediments.Regulatorymethodsusingsolventextractionhavenotachievedthewidecalibrationrangesfromnanogramstomilligramsperlitreandtherequiredlevelsofdetectioninthenanogram-per-litrerange.Inaddition,conventionalsolventextractionmethodsrequirelargealiquotvolumes(litreorlarger),useoflargevolumesoforganicsolvents,andfiltrationtogeneratetheporewater.ThisapproachentailsthestorageandprocessingoflargevolumesofsedimentsamplesandlossoflowmolecularweightPAHsinthefiltrationandsolventevaporationsteps.ThismethodcanbeusedtodeterminenanogramtomilligramperlitrePAHconcentrationsinporewater.SmallvolumesofporewaterarerequiredforSPMEextraction,only1.5mLperdeterminationandvirtuallynosolventextractionwasteisgenerated.1.1TheU.S.EnvironmentalProtectionAgency(USEPA)narcosismodelforbenthicorganismsinsedimentscontaminatedwithpolycyclicaromatichydrocarbons(PAHs)isbasedontheconcentrationsofdissolvedPAHsintheinterstitialwateror"porewater"insediment.ThistestmethodcoverstheseparationofporewaterfromPAH-impactedsedimentsamples,theremovalofcolloids,andthesubsequentmeasurementofdissolvedconcentrationsoftherequired10parentPAHsand14groupsofalkylateddaughterPAHsintheporewatersamples.The"24PAHs"aredeterminedusingsolid-phasemicroextraction(SPME)followedbyGasChromatography/MassSpectrometry(GC/MS)analysisinselectedionmonitoring(SIM)mode.Isotopicallylabeledanalogsofthetargetcompoundsareintroducedpriortotheextraction,andareusedasquantificationreferences.1.2LowermolecularweightPAHsaremorewatersolublethanhighermolecularweightPAHs.Therefore,USEPA-regulatedPAHconcentrationsinporewatersamplesvarywidelyduetodifferingsaturationwatersolubilitiesthatrangefrom0.2956g/Lforindeno[1,2,3-cd]pyreneto31000956g/Lfornaphthalene.ThismethodcanaccommodatethemeasurementofmilligramperlitreconcentrationsforlowmolecularweightPAHsandnanogramperlitreconcentrationsforhighmolecularweightPAHs.1.3TheUSEPAnarcosismodelpredictstoxicitytobenthicorganismsifthesumofthetoxicunits(TUc)calculatedforall"34PAHs"measuredinaporewatersampleisgreaterthanorequalto1.Forthisreason,theperformancelimitrequiredfortheindividualPAHmeasurementsweredefinedastheconcentrationofanindividualPAHthatwouldyield1/34ofatoxicunit(TU).However,thefocusofthismethodisthe10parentPAHsand14groupsofalkylatedPAHs()thatcontribute95%ofthetoxicunitsbasedontheanalysisof120backgroundandimpactedsedimentporewatersamples.Theprimaryreasonsforeliminatingtherestofthe5-6ringparentPAHsare:(1)thesePAHscontributeinsignificantlytotheporewaterTU,and(2)thesePAHsexhibitextremelylowsaturationsolubilitiesthatwillmakethedetectionofthesecompoundsdifficultinporewater.Thismethodcanachievetherequireddetectionlimits,whichrangefromapproximately0.01956g/L,forhighmolecularweightPAHs,toapproximately3956g/LforhighmolecularweightPAHs.1.4ThetestmethodmayalsobeappliedtothedeterminationofadditionalPAHcompounds(forexample,5-and6-ringPAHsasdescribedinHawthorneetal).However,itistheresponsibilityoftheuserofthisstandardtoestablishthevalidityofthetestmethodforthedeterminationofPAHsotherthanthosereferencedin1.1andTable1.Thisst......
【中国标准分类号】:G17
【国际标准分类号】:13_080_10
【页数】:23P.;A4
【正文语种】: