EPA METHOD 3051 Microwave Assisted Acid

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1、METHOD3051MICROWAVEASSISTEDACIDDIGESTIONOFSEDIMENTS,SLUDGES,SOILS,ANDOILS1.0SCOPEANDAPPLICATION1.1Thismethodisapplicabletothemicrowaveassistedaciddigestionofsludges,sediments,soils,andoilsforthefollowingelements:AluminumCadmiumIronMolybdenumSodiumAntimonyCalciumLeadNickelStrontiumArsenic

2、ChromiumMagnesiumPotassiumThalliumBoronCobaltManganeseSeleniumVanadiumBariumCopperMercurySilverZincBeryllium1.2ThismethodisprovidedasanalternativetoMethod3050.Itisintendedtoprovidearapidmultielementacidleachdigestionpriortoanalysissothatdecisionscanbemadeaboutsitecleanuplevels,theneedfor

3、TCLPtestingofawasteandwhetheraBDATprocessisprovidingacceptableperformance.Ifadecompositionincludinghydrochloricacidisrequiredforcertainelements,itisrecommendedthatMethod3050Abeused.Digestsproducedbythemethodaresuitableforanalysisbyflameatomicabsorption(FLAA),graphitefurnaceatomicabsorpti

4、on(GFAA),inductivelycoupledplasmaemissionspectroscopy(ICP-ES)andinductivelycoupledplasmamassspectrometry(ICP-MS).Duetotherapidadvancesinmicrowavetechnology,consultyourmanufacturer'srecommendedinstructionsforguidanceontheirmicrowavedigestionsystemandrefertotheSW-846"DISCLAIMER"whenconduct

5、inganalysesusingMethod3051.2.0SUMMARYOFMETHOD2.1Arepresentativesampleofupto0.5gisdigestedin10mLofconcentratednitricacidfor10minusingmicrowaveheatingwithasuitablelaboratorymicrowaveunit.Thesampleandacidareplacedinafluorocarbon(PFAorTFM)microwavevessel.Thevesseliscappedandheatedinthemicrow

6、aveunit.Aftercooling,thevesselcontentsarefiltered,centrifuged,orallowedtosettleandthendilutedtovolumeandanalyzedbytheappropriateSW-846method(Ref.1).3.0INTERFERENCES3.1Veryreactiveorvolatilematerialsthatmaycreatehighpressureswhenheatedmaycauseventingofthevesselswithpotentiallossofsamplean

7、danalytes.Thecompletedecompositionofeithercarbonates,orcarbonbasedsamples,maycauseenoughpressuretoventthevesselifthesamplesizeisgreaterthan0.25gwhenusedinthe120mLvesselswithapressurereliefdevicethathasanupperlimitof7.5±0.7atm(110±10psi).CD-ROM3051-1Revision0September19944