Designation:E2403−06(Reapproved2012)StandardTestMethodforSulfatedAshofOrganicMaterialsbyThermogravimetry1ThisstandardisissuedunderthefixeddesignationE2403;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisstandarddescribesthedeterminationofsulfatedashcontent(sometimescalledresidue-on-ignition)oforganicmaterialsbythermogravimetry.Themethodconvertscommonmetalsfoundinorganicmaterials(suchassodium,potassium,lithium,calcium,magnesium,zinc,andtin)intotheirsulfatesaltspermittingestimationoftheirtotalcontentassulfatesoroxides.Therangeofthetestmethodisfrom0.1to100%metalcontent.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesandtodeterminetheapplicabilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D874TestMethodforSulfatedAshfromLubricatingOilsandAdditivesD914TestMethodsforEthylcelluloseD3516TestMethodsforAshingCelluloseE473TerminologyRelatingtoThermalAnalysisandRhe-ologyE1131TestMethodforCompositionalAnalysisbyThermo-gravimetryE1142TerminologyRelatingtoThermophysicalPropertiesE1582PracticeforCalibrationofTemperatureScaleforThermogravimetryE2040TestMethodforMassScaleCalibrationofThermo-gravimetricAnalyzers2.2OtherStandards:TheUnitedStatesPharmacopeiaXXIIandTheNationalFormularyXVII,UnitedStatesPharmacopeialConvention,Rockville,MD,1990,Section281,p.15273.Terminology3.1Definitions—TechnicaltermsusedinthisstandardaredefinedinTerminologiesE473andE1142.3.1.1sulfatedash,n—theresidueremainingafteraspeci-menhasbeenoxidized,andtheresiduesubsequentlytreatedwithsulfuricacidandheatedtoconstantweight.3.1.2re...
