EPA method 8031 ACRYLONITRILE BY GAS CHROMATOGRAPHY

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1、METHOD8031ACRYLONITRILEBYGASCHROMATOGRAPHY1.0SCOPEANDAPPLICATION1.1Method8031isusedtodeterminetheconcentrationofacrylonitrileinwater.Thismethodmayalsobeapplicabletoothermatrices.Thefollowingcompoundcanbedeterminedbythismethod:_________________________________________________________

2、_____________________aCompoundNameCASNo.Acrylonitrile107-13-1______________________________________________________________________________aChemicalAbstractServicesRegistryNumber.1.2TheestimatedquantitationlimitofMethod8031fordeterminingtheconcentrationofacrylonitrileinwaterisapprox

3、imately10µg/L.1.3Thismethodisrestrictedtousebyorunderthesupervisionofanalystsexperiencedintheuseofgaschromatographsandskilledintheinterpretationofgaschromatograms.Eachanalystmustdemonstratetheabilitytogenerateacceptableresultswiththismethod.2.0SUMMARYOFMETHOD2.1Ameasuredsamplevolume

4、ismicro-extractedwithmethyltert-butylether.TheextractisseparatedbygaschromatographyandmeasuredwithaNitrogen/Phosphorusdetector.3.0INTERFERENCES3.1Methodinterferencesmaybecausedbycontaminantsinsolvents,reagents,glassware,andothersampleprocessinghardwarethatleadstodiscreteartifactsand

5、/orelevatedbaselinesingaschromatograms.Allofthesematerialsmustberoutinelydemonstratedtobefreefrominterferencesundertheconditionsoftheanalysisbyrunninglaboratoryreagentblanks.3.2Samplescanbecontaminatedbydiffusionofvolatileorganicsaroundtheseptumsealintothesampleduringhandlingandstor

6、age.Afieldblankshouldbepreparedfromorganic-freereagentwaterandcarriedthroughthesamplingandsamplehandlingprotocoltoserveasacheckonsuchcontamination.3.3Contaminationbycarryovercanoccurwheneverhigh-concentrationandlow-concentrationsamplesaresequentiallyanalyzed.Toreducecarryover,theCD-

7、ROM8031-1Revision0September1994samplesyringemustberinsedoutbetweensampleswithsolvent.Wheneveranunusuallyconcentratedsampleisencountered,itshouldbefollowedbytheanalysisofsolventtocheckforcrosscontamination.4.0APPARATUSANDMATERIALS4.1Gaschromatographsystem4.1.1Gaschromatograph,analyti

8、calsystemcompletewi