Designation:D3943−21StandardTestMethodforTotalMolybdenuminFreshAlumina-BaseCatalysts1ThisstandardisissuedunderthefixeddesignationD3943;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofmolybde-numinalumina-basecatalystsandhasbeencooperativelytestedatmolybdenumconcentrationsfrom8to18weight%,expressedasMoO3.Anycomponentofthecatalystotherthanmolybdenumsuchasiron,tungsten,etc.,whichiscapableofbeingoxidizedbyeitherferricorcericionsafterbeingpassedthroughazinc-amalgamreductorcolumn(Jonesreductor)willinterfere.1.2Units—ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Manycatalyststhatcontainmolybdenumalsocontainothermetals,nickelforexample,thatmayberegulatedbytheEPA.Gotothematerialsafetydatasheetforthecatalystmaterialbeinganalyzed.MoreinformationcanbefoundatEPA.gov.AdditionalinformationonnickelcontainingcatalystscanbefoundinTestMethodD4481.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D1193SpecificationforReagentWaterD4481TestMethodforTotalNickelinFreshAlumina-BaseCatalystsD7442PracticeforSamplePreparationofFluidCatalyticCrackingCatalystsandZeolitesforElementalAnalysisbyInductivelyCoupledPlasmaOpticalEmissionSpectros-copyE173PracticeforCon...
