Designation:D2023−89(Reapproved2016)StandardTestMethodofAnalysisforSodiumTolueneSulfonateinDetergents1ThisstandardisissuedunderthefixeddesignationD2023;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoverstheanalysisfortheapparentsodiumtoluenesulfonate(NaTS)contentofdetergents.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.MaterialSafetyDatasheetsareavailableforreagentsandmaterials.Reviewthemforhazardspriortousage.2.ReferencedDocuments2.1ASTMStandards:2D1193SpecificationforReagentWater3.SummaryofTestMethod3.1Thistestmethodisbasedontheseparationofthelowmolecularweightsulfonatefrominterferinghighermolecularweightsulfonatesanddeterminationbyultravioletabsorption.Thehighermolecularweightsulfonatesareextractedassulfonicacidsinahydrochloricacidsolutionusingethyletherasthesolvent.4.SignificanceandUse4.1Thistestmethodisofusetoanyoneengagedincompositionalanalysisofdetergentformulations.Thiswouldincludeformulators,andanalystsemployedbycompaniesthatmanufacturethecomponentsusuallyincludedinsuchformu-lations.5.Interferences5.1Anylowmolecularweightsubstitutedbenzenesul-fonateorbenzenesulfonate(NaBS)itselfwillinterfereandgiveanapparenttoluenesulfonatefigure.Sincethemethodisstandardizedusingp-toluenesulfonate,o-sulfonatewillnotbeassayedcorrectly.Whencontaminationissuspected,itshouldbecheckedbyrunningacompleteabsorptioncurveandcomparingwithknownsamples.6.ApparatusNOTE1—Absolutecleanlinessofapparatusisessential.Useglassapparatusonly.Contactwithrubber,cork,...
