EPA METHOD 3005A Acid Digestion of Waters for

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1、METHOD3005AACIDDIGESTIONOFWATERSFORTOTALRECOVERABLEORDISSOLVEDMETALSFORANALYSISBYFLAAORICPSPECTROSCOPY1.0SCOPEANDAPPLICATION1.1Method3005isanaciddigestionprocedureusedtopreparesurfaceandgroundwatersamplesforanalysisbyflameatomicabsorptionspectroscopy(FLAA)orbyinductivelycoup

2、ledargonplasmaspectroscopy(ICP).SamplespreparedbyMethod3005maybeanalyzedbyAASorICPforthefollowingmetals:AluminumMagnesiumAntimony**ManganeseArsenic*MolybdenumBariumNickelBerylliumPotassiumCadmiumSelenium*CalciumSilverChromiumSodiumCobaltThalliumCopperVanadiumIronZincLead*ICP

3、only**MaybeanalyzedbyICP,FLAA,orGFAA1.2Whenanalyzingfortotaldissolvedmetalsfilterthesample,atthetimeofcollection,priortoacidificationwithnitricacid.2.0SUMMARYOFMETHOD2.1Totalrecoverablemetals-Theentiresampleisacidifiedatthetimeofcollectionwithnitricacid.Atthetimeofanalysisth

4、esampleisheatedwithacidandsubstantiallyreducedinvolume.Thedigestateisfilteredanddilutedtovolume,andisthenreadyforanalysis.2.2Dissolvedmetals-Thesampleisfilteredthrougha0.45-µmfilteratthetimeofcollectionandtheliquidphaseisthenacidifiedatthetimeofcollectionwithnitricacid.Sampl

5、esfordissolvedmetalsdonotneedtobedigestedaslongastheacidconcentrationshavebeenadjustedtothesameconcentrationasinthestandards.3.0INTERFERENCES3.1Theanalystshouldbecautionedthatthisdigestionproceduremaynotbesufficientlyvigoroustodestroysomemetalcomplexes.CD-ROM3005A-1Revision1

6、July1992Precipitationwillcausealoweringofthesilverconcentrationandthereforeaninaccurateanalysis.4.0APPARATUSANDMATERIALS4.1Griffinbeakersofassortedsizesorequivalent.4.2Watchglassesorequivalent.4.3Qualitativefilterpaperandfilterfunnels.4.4Graduatedcylinderorequivalent.4.5Elec

7、trichotplateorequivalent-adjustableandcapableofomaintainingatemperatureof90-95C.5.0REAGENTS5.1Reagentgradechemicalsshallbeusedinalltests.Unlessotherwiseindicated,itisintendedthatallreagentsshallconformtothespecificationsoftheCommitteeonAnalyticalReagentsoftheAmericanChemical

8、Society,wheresuchspecificationsareavailable.Othergradesmaybeused,providedit