Designation:D4905−99(Reapproved2009)StandardPracticeforPreparationofSolutionofSolid,PastyandPowderedVegetableTanninExtracts1ThisstandardisissuedunderthefixeddesignationD4905;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoversastandardprocedureforuseinpreparingtheanalyticalsolutionrequiredfortheanalysisofsolid,pasty,orpowderedvegetabletanninextracts.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D4903TestMethodforTotalSolidsandWaterinVegetableTanningMaterialExtractsD4904PracticeforCoolingofAnalyticalSolutionsD6403TestMethodforDeterminingMoistureinRawandSpentMaterialsD6404PracticeforSamplingVegetableMaterialsContain-ingTannin2.2ALCAMethod:A11PreparationofSolutionofSolid,Pasty,andPowderedExtracts33.SummaryofPractice3.1Thispracticedescribesaproceduretofollowinthepreparationofanalyticalstrengthsolutionsfromsamplesofsolid,pasty,andpowderedvegetabletanninextracts.4.SignificanceandUse4.1Theconcentrationoftanninsinsolid,pasty,andpow-deredextractsneedstobereducedtoanalyticalstrengthfortanninanalyses.4.2Vegetabletanninextractsareheterogeneousmixturesofcomponentswithvaryingsolubility.4.3Thesolubilityofsuchextractsisinfluencedbytempera-tureandconcentration,whichaffectthedegreeofdispersionandsizeofthecomponentparticles.4.4Sinceextractshavegreatersolubilityinhotwaterthancold,itisdesirabletodissolveanddisperseanextractinhotwaterandthenletthesolutioncoolslowlytostandardroomtemperature.4.5Itisoftendifficulttoreducesamp...
