Designation:D1757–03StandardTestMethodforSulfateSulfurinAshfromCoalandCoke1ThisstandardisissuedunderthefixeddesignationD1757;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodpertainstothedeterminationofsulfatesulfurincoalorcokeash.1.2ThevaluesstatedinSIunits(PracticeE380)shallberegardedasthestandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:D1193SpecificationforReagentWater2D2795TestMethodsforAnalysisofCoalandCokeAsh3D3174TestMethodforAshintheAnalysisSampleofCoalandCokefromCoal3D3177TestMethodsforTotalSulfurintheAnalysisSampleofCoalandCoke3D3682TestMethodforMajorandMinorElementsinCombustionResiduesfromCoalUtilizationProcesses3D4326TestMethodforMajorandMinorElementsinCoalandCokeAshbyX-RayFluorescence3E380PracticeforUseoftheInternationalSystemofUnits(SI)(theModernizedMetricSystem)42.2BritishStandard:BS1016,Part14AnalysisofCoalAshandCokeAsh53.SummaryofTestMethods3.1TestMethodA—ModifiedBritishMethod—Aspecifiedquantityofashisdigestedinboilingdilutehydrochloricacidsolutiontowhichbrominewaterisaddedtoconvertsulfitethatmaybepresenttothesulfateform.Afterneutralizationandprecipitationofironwithammoniumhydroxide,themixtureisfilteredandsulfateinthefiltrateisdeterminedgravimetricallyasbariumsulfate(BaSO4).3.2TestMethodB—EschkaMixture—AspecifiedquantityofashandEschkamixtureareignitedtogetherinair.Thesulfatesaredissolvedinhotwaterandseparatedfromundis-solvedashresidueandmagnesiumoxidebyfiltration.Sulfateinthefiltrateisdeterminedgravimetricallyasbariumsulfate(BaSO4).4.SignificanceandUse4.1Laboratoryfurnacetemperat...
