Designation:D3897−18StandardTestMethodforCalculationofBasicityofChromeTanningLiquors1ThisstandardisissuedunderthefixeddesignationD3897;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodisintendedtoshowhowtheresultsofthechromiumanalysis(TestMethodsD3898orD6019)andtheaciditydetermination(TestMethodD3913)canbecom-binedtopermitcalculationofthebasicityofachrometanningliquor.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D3898TestMethodforChromicOxideinBasicChromiumTanningLiquorsD3913TestMethodforAcidityinBasicChromiumTanningLiquorsD6019TestMethodforDeterminationofChromicOxideinBasicChromiumTanningLiquors(AmmoniumPersulfateOxidation)3.SignificanceandUse3.1Basicityisaratio.Inanychromicsaltsolution,theelectrovalenceofthechromium(+3)issatisfiedbythehy-droxylionsandbyacidions.Theextenttowhichthiselectravalenceissatisfiedbythehydroxylions,expressedasapercentage,isthebasicity.Thebasicityofachrometanningliquidiscloselyrelatedtothetanningbehaviorofthesolution.4.Procedure4.1DeterminethechromicoxideasdescribedinTestMethodD3898orD6019.DeterminetheacidasdescribedinTestMethodD3913.5.Results5.1Thebasicityoftheliquorshallbeexpress...
