Designation:D1980–87(Reapproved1998)StandardTestMethodforAcidValueofFattyAcidsandPolymerizedFattyAcids1ThisstandardisissuedunderthefixeddesignationD1980;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofacidvalue(ameasureoftheacidityoramountoffreefattyacids)andisapplicabletoallfattyacidsandpolymerizedfattyacids.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:D1193SpecificationforReagentWater23.Terminology3.1Definitions:3.1.1acidvalue—thenumberofmilligramsofpotassiumhydroxiderequiredtoneutralizethefattyacidsin1gofsample.4.SignificanceandUse4.1Dryingoilsarecomposedprimarilyoftriglyceridesoffattyacids,andnormallycontainlowamountsoffreefattyacids.Howevertheycanbesaponifiedtoproduceessentiallyonlyfattyacids.Thistestmethodisusedtodeterminetheacidity(acidvalue)ofthefattyacidsandisthereforeindicativeoftheamountoffreefattyacidsinasample.4.2Thistestmethodisnottobeusedasaqualityrequire-mentsinceitmeasuresallacidiccomponentsanddoesnotdistinguishbetweenfattyacidsofdifferentcomposition.5.Reagents5.1PurityofReagents—Reagentgradechemicalsshallbeusedinalltests.Unlessotherwiseindicated,itisintendedthatallreagentsshallconformtotheSpecificationsoftheCom-mitteeonAnalyticalReagentsoftheAmericanChemicalSociety,wheresuchspecificationsareavailable.3Othergradesmaybeused,provideditisfirstascertainedthatthereagentisofsufficientlyhighpuritytopermititsusewithoutlesseningtheaccuracyofthedetermination.5.2PurityofWater—Unlessotherwiseindicated,referencestowatershallbeunderstoodtomeanwaterconformingtoTypeIIofSpecifi...
