Designation:D2807−17aStandardTestMethodforChromicOxideinLeather(PerchloricAcidOxidation)1ThisstandardisissuedunderthefixeddesignationD2807;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thistestmethodcoversthedeterminationofchromicoxideinleathersthathavebeenpartlyorcompletelytannedwithchromiumcompounds.Ingeneralthesampleswillcon-tainbetween1and5%chromium,calculatedaschromicoxide.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,healthandenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.SeeSection7forspecificsafetyhazards.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D2617TestMethodforTotalAshinLeatherD2813PracticeforSamplingLeatherforPhysicalandChemicalTestsD2868TestMethodforNitrogenContent(Kjeldahl)andHideSubstanceContentofLeather,WetBlueandWetWhiteD3495TestMethodforHexaneExtractionofLeatherD3790TestMethodforVolatileMatter(Moisture)ofLeatherbyOvenDrying3.SummaryofTestMethod3.1TheperchloricacidmethodisappliedtotheashobtainedinTestMethodD2617.Intheaciddigestion,anyremainingorganicmatterisdestroyedandthechromiumoxidizedtothehexavalentstate.Ondilution,thechromiumistitratedvolumetricallywiththiosulfateorferroussalt.Theperchloricacidmethodrequireslessmanipulatio...
