Designation:E1938−13StandardTestMethodforDeterminationofTitaniuminNickelAlloysbyDiantipyrylmethaneSpectrophotometry1ThisstandardisissuedunderthefixeddesignationE1938;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationoftitaniuminnickelalloysintherange0.3%to5.0%.Withappropriatereferencematerials,thetestmethodmaybeextendeddownto0.05%.1.2Molybdenum,ifpresent,maycauseahighbiastotheextentof0.001%titaniumforevery1%molybdenum.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Forspecifichazardsassociatedwiththeuseofthistestmethod,seePracticesE50.2.ReferencedDocuments2.1ASTMStandards:2E50PracticesforApparatus,Reagents,andSafetyConsid-erationsforChemicalAnalysisofMetals,Ores,andRelatedMaterialsE135TerminologyRelatingtoAnalyticalChemistryforMetals,Ores,andRelatedMaterialsE882GuideforAccountabilityandQualityControlintheChemicalAnalysisLaboratoryE1601PracticeforConductinganInterlaboratoryStudytoEvaluatethePerformanceofanAnalyticalMethod2.2ISOStandards:3ISO5725:1986PrecisionofTestMethods—DeterminationofRepeatabilityandReproducibilityforaStandardTestMethodbyInter-LaboratoryTestsISO11433:1993(E)NickelAlloys—DeterminationofTita-niumContent—DiantipyrylmethaneMolecularAbsorp-tionSpectrometricMethod3.Terminology3.1Definitions—Fordefinitionsoftermsusedinthistestmethod,refertoTerminologyE135.4.SummaryofTestMethod4.1ThistestsampleisdissolvedinamixtureofHClandHNO3.ThesolutionisevaporatedtofumesofH2SO4toremovetheHClandHNO3.Colorisdevelopedwithdi...
