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1、METHOD3561SUPERCRITICALFLUIDEXTRACTIONOFPOLYNUCLEARAROMATICHYDROCARBONS1.0SCOPEANDAPPLICATION1.1Method3561describestheuseofsupercriticalfluidsfortheextractionofpolynucleararomatichydrocarbons(PAHs)fromsoils,sediments,flyash,solid-phaseextractionmedia,andoth
2、ersolidmaterialswhichareamenabletoextractionwithconventionalsolvents.Thismethodissuitableforusewithanysupercriticalfluidextraction(SFE)systemthatallowsextractionconditions(e.g.,pressure,temperature,flowrate)tobeadjustedtoachieveextractionofthePAHsfromthemat
3、ricesofconcern.Thefollowingcompoundsmaybedeterminedbythismethod:aCompoundCASNoAcenaphthene83-32-9Acenaphthylene208-96-8Anthracene120-12-7Benz(a)anthracene56-55-3Benzo(b)fluoranthene205-99-2Benzo(k)fluoranthene207-08-9Benzo(g,h,i)perylene191-24-2Benzo(a)pyre
4、ne50-32-8Chrysene218-01-9Dibenz(a,h)anthracene53-70-3Fluoranthene206-44-0Fluorene86-73-7Indeno(1,2,3-cd)pyrene193-39-5Naphthalene91-20-3Phenanthrene85-01-8Pyrene129-00-0aChemicalAbstractServiceRegistryNumber1.2Method3561isnotsuitablefortheextractionofPAHsfr
5、omliquidsampleswithoutsometreatmentoftheliquidpriortointroductionintotheSFEsystem.Ifliquidsamplesarenotfirst"stabilized,"thesamplemaybeextrudedthroughtheendpiecesoftheSFEdevicewithoutundergoingextraction.Inthecaseofaqueoussamples,oneapproachistousesolid-pha
6、seextraction(SPE),asdescribedinMethod3535.TheaqueoussamplemaybepassedthroughanSPEdiskandtheanalytesextractedfromthediskusingSFE.1.3Theextractionconditionslistedinthisprocedure(Sec.7.5)wereusedtodevelopthedatausingavariablerestrictorandsolidtrappingmediarefe
7、rencedinSec.9.2.Otherextractionconditionsandequipmentareacceptableaslongasappropriatemethodperformanceisdemonstrated.Themethodperformancedemonstrationshouldbebasedontheextractionofacertifiedsample,notonspikedsoil/solids.Alternatively,acomparisonofSFEandSoxh
8、letextractiondatausinganenvironmentallycontaminatedPAHsamplemaybeperformed.FollowtheguidanceCD-ROM3561-1Revision0December1996fortheinitialdemonstrationoflaboratoryproficiencyfoundinSection8.0ofMethod35
