Designation:C1235–99StandardTestMethodforPlutoniumbyTitanium(III)/Cerium(IV)Titration1ThisstandardisissuedunderthefixeddesignationC1235;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodisapplicabletotheassayorpuritydeterminationofplutoniummetalof98%purityorhigher.Uraniumandironareknowninterferencesandmustbedeterminedseparately.Theirrespectivecorrectionsmustthenbemadetotheassayvalue.1.2Therecommendedamountofplutoniumdeterminedinthetitrationis210to240mg.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:C1009GuideforEstablishingaQualityAssurancePro-gramforAnalyticalChemistryLaboratoriesWithintheNuclearIndustry2C1068GuideforQualificationofMeasurementMethodsbyaLaboratoryWithintheNuclearIndustry2C1128GuideforPreparationofWorkingReferenceMate-rialsforUseintheAnalysisofNuclearfuelCycleMaterials2C1156GuideforEstablishingCalibrationforaMeasure-mentMethodUsedtoAnalyzeNuclearFuelCycleMate-rials2C1210GuideforEstablishingaMeasurementSystemQualityControlProgramforAnalyticalChemistryLabo-ratoriesWithintheNuclearIndustry2C1297GuideforQualificationofLaboratoryAnalystsfortheAnalysisofNuclearFuelCycleMaterials23.SummaryofTestMethod3.1Inaredoxtitration,astitrantisadded,thechangeinconcentrationoftheredoxcoupleismonitored.Thischangeinconcentrationoftheredoxcouplecanbemonitoredbymeasuringthepotentialdifferencebetweenaplatinumindica-torelectrodeandareferenceelectrode(suchasasaturatedcalomelelectrode)incontactwiththesolutionorbyotherequivalentmethodsofendpointdetermination.Theendpointofthetitrationisusuallychosentobethepointatwhichther...
