ASTMD2bYl89II07595300026117LiTU7Designation:D2641L69AMERICANSOCIETVFORTESTlNQANDMATERIALS1916RaceSI..Phikldphii,Pa.10103StandardTestMethodforChlorineinCellulose’ThisstandardisissuedunderthefixeddesignationD2641;thenumberimmediatelyfollowingthed&nationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(6)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope5.Apparatus1.1Thistestmethod’coversthedeterminationof&IO-rineincellulose.Proceduresfortotalchlorine,waterinsol-ublechlorine,andalcohol-benzeneinsolublechlorinearedescribed,Therangeis5to1000ppmoncellulose.Totalchlorinedeterminations(includingashing)canbeperformedatarateofonedeterminationevery30min.5.1PotentiometricTitrator,preferablyequippedwitharecorder.Theuseofarecorderisconsideredessentialatlowlevelsofchlorine.41.2Thisstandardmayinvolvehazardousmaterials,oper-ations,andequipment.Thisstandarddoesnotpurport‘toaddressallofthesafetyproblemsassociatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesqfetyandtlealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.5.2Electrodes,glassormercuroussulfatereferenceelec-trodeandsilver-silverchlorideindicatorelectrode,5,3CombustionFlasksWOO-mLconical,borosilicateglass,with35/25ballandjointstopperand5000-mLroundbottom,borosilicateglass,with65/40ballandjointstopper.Theflasksareequippedwithperforatedplatinumsamplecarrierssealedintoextendedstemofflaskstopper.5.4Igniter,suitableforignitingthesampleintheflask.An“infraredigniter”ispreferred.5.5SpecimenWrappers,blackpaper.2.ReferencedDocument2.1ASTMStandard:D1794TestMethodforAlcohol-BenzeneSolubleMatterinCellulose33.SummaryofTestMethod3.1ThetotalchlorinedeterminationisameasureofthewatersolublechloridesaswellasthechlorineboundinthePulP.3.2Thistestmethodmakesuseoftheoxygenflasktechniqueforthecombustionofthepulpsample,Aftercombustion,thechlorideionsareabsorbedindiluteso...
