Designation:D7876−13StandardPracticeforPracticeforSampleDecompositionUsingMicrowaveHeating(WithorWithoutPriorAshing)forAtomicSpectroscopicElementalDeterminationinPetroleumProductsandLubricants1ThisstandardisissuedunderthefixeddesignationD7876;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoverstheprocedureforuseofmicrowaveradiationforsampledecompositionpriortoelementaldeter-minationbyatomicspectroscopy.1.1.1Althoughthispracticeisbasedontheuseofinduc-tivelycoupledplasmaatomicemissionspectrometry(ICP-AES)andatomicabsorptionspectrometry(AAS)astheprimarymeasurementtechniques,otheratomicspectrometrictechniquesmaybeusediflowerdetectionlimitsarerequiredandtheanalyticalperformancecriteriaareachieved.1.2Thispracticeisapplicabletobothpetroleumproductsandlubricantssuchasgreases,additives,lubricatingoils,gasolines,anddiesels.1.3AlthoughnotapartofCommitteeD02’sjurisdiction,thispracticeisalsoapplicabletootherfossilfuelproductssuchascoal,flyash,coalash,coke,andoilshale.1.3.1SomeexamplesofactualuseofmicrowaveheatingforelementalanalysisoffossilfuelproductsandothermaterialsaregiveninTable1.1.3.2SomeadditionalexamplesofASTMmethodsformicrowaveassistedanalysisinthenon-fossilfuelsareaareincludedinAppendixX1.1.4Duringthesampledissolution,thesamplesmaybedecomposedwithavarietyofacidmixture(s).Itisbeyondthescopeofthispracticetospecifyappropriateacidmixturesforallpossiblecombinationsofelementspresentinalltypesofsamples.Butifthedissolutionresultsinanyvisibleinsolublematerial,thispracticemaynotbeapplicableforthetypeofsamplebeinganalyzed,assumingtheinsolublematerialcon-tainssomeoftheanalytesofinterest.1.5Itispossiblethatthismicrowave-assisteddecomposi-tionproceduremayleadtoalossof“volatile”elementssuchasarsenic,boron,chromium,mercury,antimony,selenium,and/orti...
