EPA_Method_8081B.pdf

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1、________________________________________________________________________EPAMethod8081BOrganochlorinePesticidesbyGCMethod8081Bisusedtodeterminetheconcentrationsofvariousorganochlorinepesticidesinextractsfromsolidandliquidmatrices,usingfusedsilica,open-tubular,capil

2、larycolumnswithelectroncapturedetectors(ECD)orelectrolyticconductivitydetectors(ELCD).Theanalytesareextractedfromthewaterusinga47,50,or90mmSolidPhaseExtraction(SPE)C-18disk.ThediskisextractedwithAcetoneandMethyleneChloride,theextractdriedwithsodiumsulfate,andreduc

3、edinvolumeto1.0mL.FinalanalysisisbyGC.AnalytesAldrinα-BHCβ-BHCLindaneδ-BHCChlorobenzilateα-Chlordaneγ-ChlordaneChlordaneDBCP4,4’-DDD4,4’-DDE4,4’-DDTDiallateDieldrinEndosulfanIEndosulfanIIEndosulfansulfateEndrinEndrinaldehydeEndrinketoneHeptachlorHetachlorepoxideIs

4、odrinHexachlorocyclopentadieneMethoxychlorToxapheneSPEDiskOperationSummary1)PrewettheSPEDiskwith:-Hexane-Acetone-Methanol-ReagentWater2)Filterthewatersample(1L)throughthedisk.3)Air-drythediskfor3minutes.4)Rinsethediskwith:-Acetone-Hexane___________________________

5、_____________________________________________SPE-DEX®-Automated8081BMethodConnectingthesolvents:PrewetFitting#1=HexaneredPrewetFitting#2=AcetoneorangePrewetFitting#3=MethanolyellowPrewetFitting#4=ReagentWatergreenRinseFitting#1=AcetoneblueRinseFitting#2=Hexanewhit

6、eProgrammingtheControllerformethod8081:1)Prewetstep#1=solvent#1(Hexane)soaktime=1:00minairdrytime=1:30minPrewetstep#2=solvent#2(Acetone)soaktime=1:30minairdrytime=1:30minPrewetstep#3=solvent#3(Methanol)soaktime=1:00minairdrytime=0secPrewetstep#4=solvent#4(ReagentW

7、ater)soaktime=1:00minairdrytime=0sec2)Air-Dryfiltereddisk=3:00min3)Rinsestep#1=solvent#1(Acetone)soaktime=0:20secairdrytime=1:00minRinsestep#2=solvent#2(Hexane)soaktime=1:00minairdrytime=1:00minRinsestep#3=solvent#2(Hexane)soaktime=1:30minairdrytime=2:00minNote1:I

8、ncreasingthesolventbottlepressurewillincreasethevolumeofrinsesolventcollected,whiledecreasingthesolventbottlepressurewilldecreasetofinalvolumecollected.