Designation:D4900−99(Reapproved2020)StandardTestMethodforLignosulfonates(SulfiteCellulose)inTanningExtracts1ThisstandardisissuedunderthefixeddesignationD4900;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodisintendedforuseindetectingthepresenceoflignosulfonates(sulfitecellulose)inextractsoftanningmaterials.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D4901PracticeforPreparationofSolutionofLiquidVeg-etableTanninExtractsD4905PracticeforPreparationofSolutionofSolid,PastyandPowderedVegetableTanninExtractsD6404PracticeforSamplingVegetableMaterialsContain-ingTanninD6405PracticeforExtractionofTanninsfromRawandSpentMaterials2.2ALCAMethods:A50Lignosulfonates(SulfiteCellulose)33.SummaryofTestMethod3.1Thereactionwithanilineofatanningmaterialextractspecimeniscomparedwiththatofasolutioncontaininglignosulfonateandtanningmaterialknowntobefreefromlignosulfonate.4.SignificanceandUse4.1Thistestmethodisusefultodetectpossibleadulterationoftanningmaterialextractwithcheapandinferiorlignosul-fonates.5.Specimen5.1ThesampleshallbedrawnasdescribedinPracticeD6404.5.2Thespecimenshallconsistof5mLofasolutionofanalyticalstrength(4.0gtan...
