Designation:D4046−14(Reapproved2019)StandardTestMethodforAlkylNitrateinDieselFuelsbySpectrophotometry1ThisstandardisissuedunderthefixeddesignationD4046;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversaprocedureforthedetermina-tionof0.03%to0.30%byvolumeofalkylnitrateindieselfuels.1.2Thistestmethodcanbeusedforthedeterminationofanyalkylnitrateindieselfuelprovidedthatstandardsusedforcalibrationcontainthesamealkylnitrateesterasthetestspecimenstobeanalyzed.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.Forspecifichazardstatements,seeSection7.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D1193SpecificationforReagentWater3.SummaryofTestMethod3.1Thedeterminationisbasedonthesimultaneoushydro-lysisoftheesterin65%sulfuricacidsolutionandnitrationofm-xylenolbythenitricacidliberated.Thenitroxylenolisextractedfromthereactionmixtureandreactedwithsodiumhydroxidetoformtheyellowsalt.Thecolorismeasuredspectrophotometricallyat452nm,andtheconcentrationofalkylnitrateisdeterminedbyreferencetotheslopeofthecalibrationcurve.4.SignificanceandUse4.1Indieselfuel,thepresenceofalkylnitratessuchasamylnitrate,hexylnitrate,oroctylnitratecausesahigherresiduevaluethanobservedinuntreat...
