Designation:D4902−99(Reapproved2020)StandardTestMethodforEvaporationandDryingofAnalyticalSolutions1ThisstandardisissuedunderthefixeddesignationD4902;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversaprocedurefortheevaporatinganddryingofthe100mLportionsofanalyticalsolutionobtainedinthemethodsforvegetabletanninanalysis,sothatconsistentresultsmaybeobtainedforthedeterminationoftotalsolids,solublesolids,andnon-tanninsinthesample.Thistestmethodisalsointendedforuseindeterminingthemoistureinthehidepowdersamplesandthemoistureinrawandspentmaterialsinthemethodsforvegetabletanninanalysis.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D4903TestMethodforTotalSolidsandWaterinVegetableTanningMaterialExtractsD6401TestMethodforDeterminingNon-TanninsandTan-nininExtractsofVegetableTanningMaterialsD6402TestMethodforDeterminingSolubleSolidsandInsolublesinExtractsofVegetableTanningMaterialsD6403TestMethodforDeterminingMoistureinRawandSpentMaterials2.2ALCAMethods:A13EvaporationandDryingofAnalyticalSolutions33.SummaryofTestMethod3.1Thistestmethoddescribesaprocedureforevaporationanddryingofthe100mLportionsoftheanalyticalsolution...
