Designation:D4900−99(Reapproved2009)StandardTestMethodforLignosulfonates(SulfiteCellulose)inTanningExtracts1ThisstandardisissuedunderthefixeddesignationD4900;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodisintendedforuseindetectingthepresenceoflignosulfonates(sulfitecellulose)inextractsoftanningmaterials.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D4901PracticeforPreparationofSolutionofLiquidVeg-etableTanninExtractsD4905PracticeforPreparationofSolutionofSolid,PastyandPowderedVegetableTanninExtractsD6404PracticeforSamplingVegetableMaterialsContain-ingTanninD6405PracticeforExtractionofTanninsfromRawandSpentMaterials2.2ALCAMethods:A50Lignosulfonates(SulfiteCellulose)33.SummaryofTestMethod3.1Thereactionwithaniline,ofatanningmaterialextractspecimeniscomparedwiththatofasolutioncontaininglignosulfonateandtanningmaterialknowntobefreefromlignosulfonate.4.SignificanceandUse4.1Thetestmethodisusefultodetectpossibleadulterationoftanningmaterialextractwithcheapandinferiorlignosul-fonates.5.Specimen5.1ThesampleshallbedrawnasdescribedinPracticeD6404.5.2Thespecimenshallconsistof5mLofasolutionofanalyticalstrength(4.0gtanninperL),preparedasdescribedinPracticesD4901,D4905,andPracticeD6405.6.ApparatusandReagents6.1Aniline.6.2HydrochloricAcid,concentrated.6.3ComparisonSolution—Thisshallcontainlignosulfonate(sulfitecellulose)intheproportionof1gtotalsolidsto2000mLofsolution,andasmuchtanningmaterial,similartoandofthesame...
