Designation:D2080–92(Reapproved1998)StandardTestMethodforAverageMolecularWeightofFattyQuaternaryAmmoniumChlorides1ThisstandardisissuedunderthefixeddesignationD2080;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.ThismethodwaspreparedjointlybytheAmericanSocietyforTestingandMaterialsandtheAmericanOilChemists’Society.1.Scope1.1Thistestmethodcoversthedeterminationoftheaveragemolecularweightofafattyquaternaryammoniumchloridebyconvertingtotheacetate,titratingpotentiometrically,andcorrectingforthenonquaternarycomponents.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:D1193SpecificationforReagentWater2D2076TestMethodsforAcidValueandAmineValueofFattyQuaternaryAmmoniumChlorides3D2077TestMethodforAshinFattyQuaternaryAmmo-niumChlorides3D2079TestMethodforNonvolatileMatter(Solids)inFattyQuaternaryAmmoniumChlorides3E70TestMethodforpHofAqueousSolutionsWiththeGlassElectrod43.Apparatus3.1Buret,havingacapacityof25mL.3.2GlassElectrodepHMeter,conformingtotherequire-mentsofTestMethodE704orsimilarpotentiometrictitrator,andcarefullystandardizedinaccordancewiththemanufactur-er’sinstructions.3.3MagneticStirrer,withinertplastic-coatedstirringbar.4.Reagents4.1PurityofReagents—Reagentgradechemicalsshallbeusedinalltests.Unlessotherwiseindicated,itisintendedthatallreagentsshallconformtothespecificationsoftheCommit-teeonAnalyticalReagentsoftheAmericanChemicalSociety,wheresuchspecificationsareavailable.5Othergradesmaybeused,provideditisfirstascertainedthatthereagentisofsufficientlyhighpuritytopermititsusewithoutlesseningtheaccuracyofthedetermination.4.2Purityo...
