Designation:D1767−89(Reapproved2017)StandardTestMethodforEthyleneDiamineTetraacetate(EDTA)inSoapsorSyntheticDetergents1ThisstandardisissuedunderthefixeddesignationD1767;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofethylenediaminetetraacetate(EDTA)insoapsandsyntheticdetergents.ThroughoutthistestmethodEDTArepresentsthehydrateddisodiumsaltcontaining2molesofH2O.InthechemicalliteraturethisisfrequentlyabbreviatedtoNa2H2Y4·2H2O.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.MaterialSafetyDataSheetsareavailableforreagentsandmaterials.Reviewthemforhazardspriortousage.2.ReferencedDocuments2.1ASTMStandards:2D1193SpecificationforReagentWater3.PurityofReagents3.1PurityofReagents—Reagentgradechemicalsshallbeusedinalltests.Unlessotherwiseindicated,itisintendedthatallreagentsshallconformtothespecificationsoftheCommit-teeonAnalyticalReagentsoftheAmericanChemicalSociety,wheresuchspecificationsareavailable.3Othergradesmaybeused,provideditisfirstascertainedthatthereagentisofsufficientlyhighpuritytopermititsusewithoutlesseningtheaccuracyofthedetermination.3.2Unlessotherwiseindicated,referencestowatershallbeunderstoodtomeanreagentwaterconformingtoSpecificationD1193.4.Reagents4.1CopperSulfateSolution(1mL=0.0037gEDTAdiso-diumsalt)—Dissolve2.497gofcoppersulfate(CuSO4·5H2O)inwateranddiluteto1L.TheactualEDTAequivalentshouldbedeterminedbythetitrationofaknownweightofEDTAdisodiumsalt.4.2PANIndicatorSolution—Dissolve0.1gof1-(2pyridylazo)-2...
