Designation:D4794−94(Reapproved2022)´1StandardTestMethodforDeterminationofEthoxylorHydroxyethoxylSubstitutioninCelluloseEtherProductsbyGasChromatography1ThisstandardisissuedunderthefixeddesignationD4794;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ε1NOTE—Editorialupdatemadeto1.3and9.1.8inJune2022.1.Scope1.1Thistestmethodisapplicabletothedeterminationofethoxylorhydroxyethoxylsubstitutionincelluloseetherprod-uctsbyaZeiselgaschromatographictechnique.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.Forspecifichazardstatements,seeSection5and9.1.8.1.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.SummaryofTestMethod2.1Whenacelluloseethercontainingethylorhydroxyethylsubstitutesisallowedtoreactwithhydriodicacid,onemoleofiodoethaneisliberatedforeachmoleofethoxylorhydroxy-ethoxylethersubstitutedonthecellulosechain.Theiodoeth-aneisextractedinsituwitho-xyleneandquantitatedbygaschromatographyusinganinternalstandardtechnique.Itisrecommendedtorunduplicatesamples.3.Apparatus3.1GasChromatographwiththermalconductivitydetectorandheatedinjectionport.3.2ElectronicIntegrator.3.3Column—stainlesssteel,1829mminlength,3.2mminoutsidediameter,packedwiththereagentin4.6,coiledtofitthechromatographused;orequivalentcolumnandpackingasappropri...
