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1、METHOD8121CHLORINATEDHYDROCARBONSBYGASCHROMATOGRAPHY:CAPILLARYCOLUMNTECHNIQUE1.0SCOPEANDAPPLICATION1.1Method8121describesthedeterminationofchlorinatedhydrocarbonsinextractspreparedfromenvironmentalsamplesandRCRAwastes.Itdescribeswide-boreopen-tubular,capillarycolumngaschromatograph
2、yproceduresusingbothsinglecolumn/singledetectoranddual-column/dual-detectorapproaches.Thefollowingcompoundscanbedeterminedbythismethod:aCompoundNameCASRegistryNo.Benzalchloride98-87-3Benzotrichloride98-07-7Benzylchloride100-44-72-Chloronaphthalene91-58-71,2-Dichlorobenzene95-50-11,
3、3-Dichlorobenzene541-73-11,4-Dichlorobenzene106-46-1Hexachlorobenzene118-74-1Hexachlorobutadiene87-68-3-Hexachlorocyclohexane(-BHC)319-84-6-Hexachlorocyclohexane(-BHC)319-85-7-Hexachlorocyclohexane(-BHC)58-89-9-Hexachlorocyclohexane(-BHC)319-86-8Hexachlorocyclopentadiene77-47-4Hexa
4、chloroethane67-72-1Pentachlorobenzene608-93-51,2,3,4-Tetrachlorobenzene634-66-21,2,4,5-Tetrachlorobenzene95-94-21,2,3,5-Tetrachlorobenzene634-90-21,2,4-Trichlorobenzene120-82-11,2,3-Trichlorobenzene87-61-61,3,5-Trichlorobenzene108-70-3aChemicalAbstractServicesRegistryNumber.1.2Thed
5、ual-column/dual-detectorapproachinvolvestheuseoftwo30mx0.53mmIDfused-silicaopen-tubularcolumnsofdifferentpolarities,thusdifferentselectivitiestowardsthetargetcompounds.Thecolumnsareconnectedtoaninjectionteeandtwoidenticaldetectors.Whencomparedtothepackedcolumns,themegaborefused-sil
6、icaopen-tubularcolumnsofferimprovedresolution,betterselectivity,increasedsensitivity,andfasteranalysis.1.3Table1listsmethoddetectionlimits(MDL)foreachcompoundinanorganic-freereagentwatermatrix.TheMDLsforthecompoundsofaspecificsamplemaydifferfromthoselistedinTable1becausetheyaredepe
7、ndentuponCD-ROM8121-1Revision0September1994thenatureofinterferencesinthesamplematrix.Table2liststheestimatedquantitationlimits(EQL)forothermatrices.1.4Table3liststhecompoundsthathavebeendeterminedbythismethodandtheirretentiontimesusingthesinglecolumntechnique.Table4listsdualcolumn/
8、dualdetectorretentiontimed
