90092760024909998Designation:D2184-81Vz/-.ri&O/AMERICANSOCIETYFORTESTINGANOMATERIALS1916RaceSt.,Philadelphia,Pa.19103ReprintedfromtheAnnualBookofASTMStandards,CopyrightASTMIfnotlistedinthecurrentcombinedindex,willappearinthenextedition.StandardMethodofTestingDEUTERIUMOXIDE'ThisstandardisissuedunderthefixeddesignationD2184thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision.theyearoflastrevision.Anumberinparenthescsindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.scope1.1Thismethodcoversthemeasurementoftheisotopiccompositionofhydrogenindeu-teriumoxide(heavywater)whichisnominally99.75atompercentdeuterium(D),equaltoD/(D+H)X100.Theprimaryuseoftheheavywaterisasamoderatorinproduction,power,orresearchreactorsinwhichafissionablenu-clideisconsumed.insuchreactorstheper-centageofdeuteriumintheheavywaterusuallyexceeds95%.2.ApplicableDocuments2.1.ASTMStandards:D1129DefrnitionsofTermsRelatingtoWa-D1192SpecificationforEquipmentforD1193SpecificationforReagentWate3D1217TestforDensityandSpecificGrav-E1SpecificationforThermometers3E137EvaluationofMassSpectrometers4taîComplyingWaterandSteam2ity*3.SummaryofMethod3.1Therearenumerousphysicalpropertiesofheavywaterthataredifferentinvaluefromthecorrespondingvaluefornaturalwater.Thesepropertiesformthebasisofseveralin-strumentaimethodsofanalysisofheavywater.TheacceptedvalueforthespecificgravityofheavywaterisS;;=1.1077520.00003whichisroughly11%greaterthanthespecificgravityofnaturalwater.Measurementofthespecificgravityofheavywateristhemostpreciseandaccuratemethodofdeterminingtheisotopicconcentrationofheavywater.Theuncertaintyof30mg/LinS',:permitsdeterminationofatompercentdeuteriumtonobetterthank0.03atompercentdeuterium.4.Terminology4.1Definitions-CertaintermsinthismethodaredefinedinaccordancewithDefi-nitionsD1129,asfollows:4.2DescriptionsofTermsSpecifictoThisMethod4.2.1normalabundanceofanisotope-theabundanceinatompercentoftheisot...
