Designation:D5554−15StandardTestMethodforDeterminationoftheIodineValueofFatsandOils1ThisstandardisissuedunderthefixeddesignationD5554;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationoftheiodinevalueoffatsandoils.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.SignificanceandUse2.1Thistestmethodisintendedforthedeterminationoftheiodinevalueoffatsandoilsthatdonotcontainconjugateddoublebonds.Theiodinevalueisameasureoftheunsaturationoffatsandoilsandisexpressedintermsofthenumberofcentigramsofiodineabsorbedpergramofsample.3.ApparatusandReagents3.1Glass-StopperedBottlesorWideMouthErlenmeyerFlasks,500mL.Widemouthbottlesorflasksareessentialifstirringisdonebymechanicalmeans.3.2Glass-StopperedVolumetricFlasks,conformingtoNISTtolerances2andaccuratelycalibratedtocontain1000mL.3.3Pipette,20mL.3.4TwoPipettes,25mL.OnepipetteisreservedforusewiththestandardpotassiumdichromatesolutionandshallconformtoNISTtolerances2andbecalibratedtodeliver25mL.3.5GlacialAceticAcid,A.C.S.grade.Thepermanganatetestshallbeappliedtobesurethatthisspecificationismet.3.5.1Twomillilitresoftheglacialaceticacidshallbedilutedwith10mLofdistilledwaterand0.1mLof0.1NKMnO4shallbeadded.Thepinkcolorshallnotbeentirelydischargedwithin2h.3.6PotassiumIodide,A.C.S.grade.3.7Chlorine,99.8%.Satisfactorycommercialgradesareavailableincylinders,butthisgasmustbedriedbypassingthroughsulfuricacid(sp.gr.1.84)beforeintroducingintotheiodinesolution.3.7.1Chlorinemaybepreparedbyallowinghydro...
