Designation:D5070−90(Reapproved2014)StandardTestMethodforSyntheticQuaternaryAmmoniumSaltsinFabricSoftenersbyPotentiometricTitrations1ThisstandardisissuedunderthefixeddesignationD5070;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethoddescribesapotentiometrictitrationprocedureforthedeterminationofquaternaryammoniumsaltsinfabricsofteners.Thistestmethodisintendedfortheanalysisofknownquaternaryammoniumsaltssuchasthedialkyldimethylquaternaryammoniumcompoundtypeandthedi-amidoaminebasedquaternaryammoniumcompoundtype.1.2Thequaternaryammoniumsaltsconformtothestruc-turesshowninFig.1andFig.2.1.3Theanalyticalprocedureappearsinthefollowingorder:SectionApparatus5Reagents6Preparationofstandardreagents7Standardizationofhyaminesolution9Safetyprecautions8Procedurefordeterminationofdialkyldimethylquaternaries10Procedurefordeterminationofdiamidoaminebasedquaternaries111.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.See6.4,6.6,6.7andSection8forspecificwarningstatements.2.ReferencedDocuments2.1ASTMStandards:2D1193SpecificationforReagentWaterD3049TestMethodforSyntheticAnionicIngredientbyCationicTitration3.SummaryofTestMethod3.1Quaternaryammoniumcompoundspresentinfabricsofteners,astheactivematerials,aretitratedpotentiometricallyinanaqueousmediumwithastandardsolutionofsodiumlaurylsulfateusinganitrateion-selectiveelectrode.Inthispotentiometrictitration,thereactioninvolvestheformationofacomplexbetweenthequaternaryammoniumcompoundandtheanionicsurfactantwhichthenprecipitat...
