Designation:D2357−11StandardforQualitativeClassificationofSurfactantsbyInfraredAbsorption1ThisstandardisissuedunderthefixeddesignationD2357;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisstandardcoversthequalitativeclassificationofsyntheticdetergentproductsormixturesofsyntheticdeter-gents.Itisapplicabletobuiltdetergentformulationsaswellasindividualsurfactantcompositions.NOTE1—TheorganicactiveingredientmustbeisolatedfrombuiltsyndetcompositionsinaccordancewithTestMethodD2358.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D2358TestMethodforSeparationofActiveIngredientfromSurfactantandSyndetCompositions3.SummaryofClassification3.1Aportionoftheactiveingredientisscannedintheinfraredregionofthespectrumfromatleast2.5to15µm(4000to667cm–1).Qualitativeidentificationofsurfactanttypeisbasedonthepresenceofinfraredabsorptionbandsattribut-abletospecificfunctionalgroups.3.2Alistingofabsorbancebandscorrespondingtothecharacteristicfunctionalgroupsofsomeofthemorecommontypesofcommercialsurfactantsisincludedinthismethod.Useofavailabledetergentreferencespectramayprovideadditionalinformation.4.Apparatus4.1Spectrophotometer,recording,infrared,orFouriertrans-formInfrared(FTIRifavailable).4.2DiesandPress,forpreparationofKBrdisks.4.3DetergentReferenceSpectra.4.4AppropriateSamplingAccessories—ATR,Diffusere-flectanceandothersasappropriate.5.Reagents5.1PotassiumBromide(KBr),infraredquality,powdered.5.2AdditionalReagents,asspecifiedinTestMethodD2358.6.PreparationofSample6.1SampleinPureForm—Ifthesampleisinpureformorcontainsonlyvolatilesolve...
