Designation:D4794−94(Reapproved2009)StandardTestMethodforDeterminationofEthoxylorHydroxyethoxylSubstitutioninCelluloseEtherProductsbyGasChromatography1ThisstandardisissuedunderthefixeddesignationD4794;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodisapplicabletothedeterminationofethoxylorhydroxyethoxylsubstitutionincelluloseetherprod-uctsbyaZeiselgaschromatographictechnique.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Forspecifichazardstatements,seeSection5andNote3.2.SummaryofTestMethod2.1Whenacelluloseethercontainingethylorhydroxyethylsubstitutesisallowedtoreactwithhydriodicacid,onemoleofiodoethaneisliberatedforeachmoleofethoxylorhydroxy-ethoxylethersubstitutedonthecellulosechain.Theiodoeth-aneisextractedinsituwitho-xyleneandquantitatedbygaschromatographyusinganinternalstandardtechnique.Itisrecommendedtorunduplicatesamples.3.Apparatus3.1GasChromatographwiththermalconductivitydetectorandheatedinjectionport.3.2ElectronicIntegrator.3.3Column—stainlesssteel,1829mminlength,3.2mminoutsidediameter,packedwiththereagentin4.6,coiledtofitthechromatographused;orequivalentcolumnandpackingasappropriate.3.4Syringe,10µL.3.5ReactionVials,Caps,andHeatingBlock.23.6Syringe,100µL.3.7Cover,stainlesssteel,fabricatedtocovertheheatingblock.4.ReagentsandMaterials4.1PurityofReagents—Reagentgradechemicalsshallbeusedinalltests.Unlessotherwiseindicated,itisintendedthatallreagentsshallconformtothespecificationsoftheCommit-teeonAnalyticalReagentsoftheAmericanChemi...
