Designation:B953−13StandardPracticeforSamplingMagnesiumandMagnesiumAlloysforSpectrochemicalAnalysis1ThisstandardisissuedunderthefixeddesignationB953;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thispracticedescribesthesamplingofmagnesiumandmagnesium-basealloystoobtainachill-castsamplesuitableforquantitativeatomicemissionspectrochemicalanalysis.Thediskintheregiontobeexcitedisrepresentativeofthemeltandgivesarepeatabilityofresultsthatapproachthatofthereferencematerialsused.1.2Thispracticedescribestheprocedureforrepresentativesamplingofmoltenmetal.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Specificprecau-tionarystatementsaregivenin5.1.2.ReferencedDocuments2.1ASTMStandards:2B954TestMethodforAnalysisofMagnesiumandMagne-siumAlloysbyAtomicEmissionSpectrometryB881TerminologyRelatingtoAluminum-andMagnesium-AlloyProductsE135TerminologyRelatingtoAnalyticalChemistryforMetals,Ores,andRelatedMaterialsE1257GuideforEvaluatingGrindingMaterialsUsedforSurfacePreparationinSpectrochemicalAnalysis3.SummaryofPractice3.1Moltenmetalrepresentativeofthefurnacemeltispoureddirectlyintoaspecifiedmold(describedin5.2.1)toproduceachill-castdisk.Thediskismachinedtoaspecificdepththatrepresentstheaveragemeltcompositionandpro-ducesanacceptablesurfaceforexcitation.3.2Fabricated,cast,orwroughtproductsmaybeexciteddirectlywithoutremelting;however,accuracyofresultsmaysufferinhighlyalloyedsamplesduetothepotentialforelementalsegregation.4.SignificanceandUse4.1Thispractice,usedinconjunction...
