EPA METHOD 7000B Flame Atomic Absorption Spectrophotometry

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1、METHOD7000BFLAMEATOMICABSORPTIONSPECTROPHOTOMETRY1.0SCOPEANDAPPLICATION1.1Metalsinsolutionmaybereadilydeterminedbyflame(directaspiration)atomicabsorptionspectrophotometry.Themethodissimple,rapid,andapplicabletoalargenumberofenvironmentalsamplesincluding,butn

2、otlimitedto,groundwater,aqueoussamples,extracts,industrialwastes,soils,sludges,sediments,andsimilarwastes.Withtheexceptionoftheanalysesfordissolvedconstituents,allsamplesrequiredigestionpriortoanalysis(refertoChapterThree).Analysisfordissolvedelementsdoesnot

3、requiredigestionifthesamplehasbeenfilteredandthenacidified.Note:Theanalystshouldbeawarethatorgano-metallicspeciesmaynotbedetectedifthesampleisnotdigested.Thismethodisapplicabletothefollowingelements:aELEMENTCASRNAluminum(Al)7429-90-5Antimony(Sb)7440-36-0Bari

4、um(Ba)7440-39-3Beryllium(Be)7440-41-7Cadmium(Cd)7440-43-9Calcium(Ca)7440-70-2Chromium(Cr)7440-47-3Cobalt(Co)7440-48-4Copper(Cu)7440-50-8Iron(Fe)7439-89-6Lead(Pb)7439-92-1Lithium(Li)7439-93-2Magnesium(Mg)7439-95-4Manganese(Mn)7439-96-5Molybdenum(Mo)7439-98-7N

5、ickel(Ni)7440-02-0Osmium(Os)7440-04-2Potassium(K)7440-09-7Silver(Ag)7440-22-4Sodium(Na)7440-23-5Strontium(Sr)7440-24-6Thallium(Tl)7440-28-0Tin(Sn)7440-31-5Vanadium(V)7440-62-2Zinc(Zn)7440-66-6aChemicalAbstractServiceRegistryNumber1.2Methoddetectionlimits,sen

6、sitivity,andoptimumrangesofthemetalswillvarywiththematricesandmodelsofatomicabsorptionspectrophotometers.ThedatashowninTable1providesomeindicationofthedetectionlimitsobtainablebythedirectaspirationtechnique.ForCD-ROM7000B-1Revision2January1998cleanaqueoussam

7、ples,thedetectionlimitsshowninthetablebydirectaspirationmaybeextendeddownwardwithscaleexpansionandupwardbyusingalesssensitivewavelengthorbyrotatingtheburnerhead.Detectionlimitsbydirectaspirationmayalsobeextendedthroughconcentrationofthesampleand/orthroughsol

8、ventextractiontechniques.Methoddetectionlimits(MDLs)mustbeestablishedempiricallyforeachmatrixtypeanalyzed(refertoChapterOneforguidance)andwouldberequiredforeachpreparatory/determinativemethodcom