Designation:D4904−99(Reapproved2009)StandardPracticeforCoolingofAnalyticalSolutions1ThisstandardisissuedunderthefixeddesignationD4904;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoversastandardprocedureforthecool-ingofanalyticalsolutionssuchasthosepreparedPracticesD4901,D4905,orD6405.Thetanninanalysisresultsforananalyticalsolutionaretosomeextentdependentontheconditionsofthecoolingofthatsolution.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D4901PracticeforPreparationofSolutionofLiquidVeg-etableTanninExtractsD4905PracticeforPreparationofSolutionofSolid,PastyandPowderedVegetableTanninExtractsD6405PracticeforExtractionofTanninsfromRawandSpentMaterials2.2ALCAMethods:A12CoolingofAnalyticalSolutions33.SummaryofPractice3.1ThispracticespecifiesaproceduretofollowincoolingtostandardorroomtemperaturethehotanalyticalsolutionspreparedfromtanningmaterialsforPracticesD4901,D4905,orD6405.4.SignificanceandUse4.1Thesolubilityofextractsisinfluencedbytemperature.Theanalyticalsolutionspreparedfromtanningextractsaredissolvedordilutedinhotwater.Itisnecessarytoexercisecautionincoolingthesesolutionsandtodosoinsuchawayastoavoidchilling,under-cooling,orunevencoolingofthesolutions.5.Specimen5.1Thespecimenshallbethe1-Lor2-LsolutionspreparedunderPracticesD4901,D4905,orD6405.6.Procedure6.1Thepreparedsolutionsshallbeprotectedfromdraftsandshallbeallowedtostandovernightinanambienttempera-tureofnotlessthan23°C,normorethan28°C.After...
