Designation:D4629−17Designation:379/88StandardTestMethodforTraceNitrogeninLiquidHydrocarbonsbySyringe/InletOxidativeCombustionandChemiluminescenceDetection1ThisstandardisissuedunderthefixeddesignationD4629;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thistestmethodcoversthedeterminationofthetracetotalnitrogennaturallyfoundinliquidhydrocarbonsboilingintherangefromapproximately50°Cto400°C,withviscositiesbetweenapproximately0.2cStand10cSt(mm2/s)atroomtemperature.Thistestmethodisapplicabletonaphthas,distillates,andoilscontaining0.3mg⁄kgto100mg⁄kgtotalnitrogen.Forliquidhydrocarbonscontainingmorethan100mg⁄kgtotalnitrogen,TestMethodD5762canbemoreappropriate.Thistestmethodhasbeensuccessfullyapplied,duringinterlaboratorystudies,tosampletypesoutsidetherangeofthescopebydilutionofthesampleinanappropriatesolventtobringthetotalnitrogenconcentrationandviscositytowithintherangecoveredbythetestmethod.However,itistheresponsibilityoftheanalysttoverifythesolubilityofthesampleinthesolventandthatdirectintroductionofthedilutedsamplebysyringeintothefurnacedoesnotcauselowresultsduetopyrolysisofthesampleorsolventinthesyringeneedle.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.See6.2,6.4,6.5,6.9,andSection7.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,Guidesan...
