Designation:D4481−21StandardTestMethodforTotalNickelinFreshAlumina-BaseCatalysts1ThisstandardisissuedunderthefixeddesignationD4481;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofnickelinfreshalumina-basecatalystsandhasbeentestedatnickelconcentrationsfrom2.5to60weight%,expressedasnickeloxide(NiO).1.2Units—ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D1193SpecificationforReagentWaterD7442PracticeforSamplePreparationofFluidCatalyticCrackingCatalystsandZeolitesforElementalAnalysisbyInductivelyCoupledPlasmaOpticalEmissionSpectros-copyE105GuideforProbabilitySamplingofMaterialsE177PracticeforUseoftheTermsPrecisionandBiasinASTMTestMethodsE456TerminologyRelatingtoQualityandStatisticsE691PracticeforConductinganInterlaboratoryStudytoDeterminethePrecisionofaTestMethod3.SummaryofTestMethod3.1Thetestspecimen(asreceived)istreatedwithconcen-tratedhydrochloricacidtosolubilizethenickel.Ifnecessary,nickelisrecoveredfromanyinsolubleresiduebypotassiumpyrosulfatefusion,afterhydrofluoric-sulfuricacidtreatmenttoremovesilica.Ammoniumcitrateisaddedtocomplexthealuminumandbufferthesolution.Nickelisprecipitateda...
