EPA METHOD 3820 Hexadecane Extraction and Screening of Purgeable Organics

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1、METHOD3820HEXADECANEEXTRACTIONANDSCREENINGOFPURGEABLEORGANICS1.0SCOPEANDAPPLICATION1.1Thismethodisascreeningprocedureforusewithpurge-and-trapGCorGC/MS.Theresultsofthisanalysisarepurelyqualitativeandshouldnotbeusedasanalternativetomoredetailedandaccuratequantitationmethods.2.0SUMMARYOFMETHOD2.1An

2、aliquotofsampleisextractedwithhexadecaneandthenanalyzedbyGC/FID.Theresultsofthisanalysiswillindicatewhetherthesamplerequiresdilutionormethanolicextractionpriortopurge-and-trapGCorGC/MSanalysis.3.0INTERFERENCES3.1Methodinterferencesmaybecausedbycontaminantsinsolvents,reagents,andglassware.Allthes

3、ematerialsmustberoutinelydemonstratedtobefreefromcontaminantsbyrunninglaboratoryreagentblanks.Matrixinterferencesmaybecausedbycontaminantsthatarecoextractedfromthesample.Theextentofmatrixinterferenceswillvaryconsiderablyfromsampletosampledependinguponthenatureanddiversityofthewaterbeingsampled.3

4、.2Theflameionizationdetectorvariesconsiderablyinsensitivitywhencomparingaromaticsandhalogenatedmethanesandethanes.Halomethanesareapproximately20xlesssensitivethanaromaticsandhaloethanesapproximately10xlesssensitive.Low-molecular-weight,water-solublesolvents(e.g.,alcoholsandketones)willnotextract

5、fromthewater,andthereforewillnotbedetectedbyGC/FID.4.0APPARATUSANDMATERIALS4.1Balance:Analytical,capableofaccuratelyweighing0.0001gm.4.2GasChromatograph:Ananalyticalsystemcompletewithgaschromatographsuitableforon-columninjectionandallrequiredaccessoriesincludingsyringes,analyticalcolumns,gases,d

6、etector,andstrip-chartrecorder(orequivalent).Adatasystemisrecommendedformeasuringpeakheightsand/orpeakareas.4.2.1Detector:Flameionization(FID).4.2.2GCcolumn:3-mx2-mmI.D.glasscolumnpackedwith10%OV-101on100/120meshChromosorbW-HP(orequivalent).Thecolumntemperatureshouldbeprogrammedfrom80ECto280ECat

7、16EC/minandheldat280ECfor10min.38201CD-ROMRevision0DateSeptember19864.3Centrifuge:Capableofaccommodating50-mLglasstubes.4.4Vialsandcaps:2-mLforGCautosampler.4.5Volumetricflasks:10-and50-mLwithground-glassstopperorTeflon-line