Designation:C698−16StandardTestMethodsforChemical,MassSpectrometric,andSpectrochemicalAnalysisofNuclear-GradeMixedOxides((U,Pu)O2)1ThisstandardisissuedunderthefixeddesignationC698;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thesetestmethodscoverproceduresforthechemical,massspectrometric,andspectrochemicalanalysisofnuclear-grademixedoxides,(U,Pu)O2,powdersandpelletstodeter-minecompliancewithspecifications.1.2Theanalyticalproceduresappearinthefollowingorder:SectionsUraniuminthePresenceofPubyPotentiometricTitration2PlutoniumbyControlled-PotentialCoulometry2PlutoniumbyAmperometricTitrationwithIron(II)2NitrogenbyDistillationSpectrophotometryUsingNesslerReagent8to15Carbon(Total)byDirectCombustion-ThermalConductivity16to26TotalChlorineandFluorinebyPyrohydrolysis27to34SulfurbyDistillation-Spectrophotometry35to43MoisturebytheCoulometric,ElectrolyticMoistureAnalyzer44to51IsotopicCompositionbyMassSpectrometry3RareEarthsbyCopperSparkSpectroscopy52to59TraceImpuritiesbyCarrierDistillationSpectroscopy60to68ImpuritiesbySpark-SourceMassSpectrography69to75TotalGasinReactor-GradeMixedDioxidePellets4TungstenbyDithiol-Spectrophotometry76to84RareEarthElementsbySpectroscopy85to88Plutonium-238IsotopicAbundancebyAlphaSpectrometry5Americium-241inPlutoniumbyGamma-RaySpectrometryUraniumandPlutoniumIsotopicAnalysisbyMassSpectrometry89to97Oxygen-to-MetalAtomRatiobyGravimetry98to1051.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesgiveninparenthesesareforinformationonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.(Forspecificsafetyprecautionstatements,seeSections6,13....
