Designation:D2929−89(Reapproved2011)StandardTestMethodforSulfurContentofCellulosicMaterialsbyX-RayFluorescence1ThisstandardisissuedunderthefixeddesignationD2929;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1ThistestmethodcoversdeterminationofsulfurcontentofcellulosicmaterialsbyX-rayfluorescence.1.2Usingappropriatestandards,therangeoftheprocedureisfromapproximately10ppmto20%sulfur.1.3Thistestmethodisproposedspecificallyasanalterna-tivetoTestMethodsD871,sectionsonSignificanceandUse,Apparatus,Reagents,ProcedureandCalculationofHydroxylContent,andTestMethodsD817,sectionsonSummaryofTestMethod,SignificanceandUse,Apparatus,Reagents,andProcedureofHydroxylContent.Asappliedtocelluloseestersitmeasuresthecombinedsulfurandsulfurintheaccompany-inginorganicsalts.1.4Todeterminecombinedsulfur,thesample,whensoluble,mustfirstbereprecipitatedintodiluteacidtoremovethenoncombinedsulfurcompounds.1.5ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Foraspecifichazardstatement,see7.2.1.2.ReferencedDocuments2.1ASTMStandards:2D817TestMethodsofTestingCelluloseAcetatePropionateandCelluloseAcetateButyrateD871TestMethodsofTestingCelluloseAcetate3.SummaryofTestMethod3.1Thesulfurcontentofcellulose,cellulosemodification,orcellulosederivativeisdeterminedbymeasuringtheintensityofthesecondarysulfurKαXraysemittedonirradiationofthesamplewithprimaryXraysofhigherenergyfromanX-raytubewithatargetoftungstenorchromium.ThesulfurKαradiationisdiffractedwithasuitableanalyzingcrystalanddetectedwithaflow-p...
