Designation:D2358−16StandardTestMethodforSeparationofActiveIngredientfromSurfactantandSyndetCompositions1ThisstandardisissuedunderthefixeddesignationD2358;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoverstheprocedurefortheseparationandpurificationofactiveingredientfromsurfactantsandsyndetcompositions.Theseparatedactiveingredientmaybeusedforqualitativeexaminations.Thistestmethodalsopermitstheestimationoftotalactiveingredientlevelpresentinthesampleundertest.1.2Thistestmethodyieldstheactiveingredienttogetherwithotheralcohol-solublematerialsandthereforeisusefulonlyinestimatingtheactualactiveingredientlevel.Correctionfortheamountofthemostcommoncontaminant,sodiumchloride,isshownbyaseparatedetermination.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.MaterialSafetyDataSheetsareavailableforreagentsandmaterials.Reviewthemforhazardspriortousage.2.ReferencedDocuments2.1ASTMStandards:2D1681TestMethodforSyntheticAnionicActiveIngredientinDetergentsbyCationicTitrationProcedure3.SummaryofTestMethod3.1Thetestmethodinvolvestheextractionoftheactiveingredientwithalcohol.Reprecipitationoftheinsolublesisspecifiedtoremovethelasttracesofactiveingredient.Dilutionofthealcoholicextracttoaknownvolumeandtheevaporationofasuitablealiquotpermitsmeasurementoftotalalcohol-solublematter.Anestimationofsodiumchloridecontentismadesothatacorrectedtotalactiveingredientlevelmaybeobtained.ProvisionismadeforpurificationoftheactiveingredientsinSection13.3.2PurityofReagents:3.2.1R...
