Designation:D4905−99(Reapproved2020)StandardPracticeforPreparationofSolutionofSolid,PastyandPowderedVegetableTanninExtracts1ThisstandardisissuedunderthefixeddesignationD4905;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoversastandardprocedureforuseinpreparingtheanalyticalsolutionrequiredfortheanalysisofsolid,pasty,orpowderedvegetabletanninextracts.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D4903TestMethodforTotalSolidsandWaterinVegetableTanningMaterialExtractsD4904PracticeforCoolingofAnalyticalSolutionsD6403TestMethodforDeterminingMoistureinRawandSpentMaterialsD6404PracticeforSamplingVegetableMaterialsContain-ingTannin2.2ALCAMethod:A11PreparationofSolutionofSolid,Pasty,andPowderedExtracts33.SummaryofPractice3.1Thispracticedescribesaproceduretofollowinthepreparationofanalyticalstrengthsolutionsfromsamplesofsolid,pasty,andpowderedvegetabletanninextracts.4.SignificanceandUse4.1Theconcentrationoftanninsinsolid,pasty,andpow-deredextractsneedstobereducedtoanalyticalstrengthfortanninanalyses.4.2Vegetabletanninextractsareheterogeneousmixturesofcomponentswithvaryingsolubility.4.3Thesolubilityofsuchextractsisinf...
