Designation:D5291−21StandardTestMethodsforInstrumentalDeterminationofCarbon,Hydrogen,andNitrogeninPetroleumProductsandLubricants1ThisstandardisissuedunderthefixeddesignationD5291;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thesetestmethodscovertheinstrumentaldeterminationofcarbon,hydrogen,andnitrogeninlaboratorysamplesofpetroleumproductsandlubricants.Valuesobtainedrepresentthetotalcarbon,thetotalhydrogen,andthetotalnitrogen.1.2Thesetestmethodsareapplicabletosamplessuchascrudeoils,fueloils,additives,andresiduesforcarbonandhydrogenandnitrogenanalysis.Thesetestmethodsweretestedintheconcentrationrangeofatleast75%to87%bymassforcarbon,atleast9%to16%bymassforhydrogen,and<0.1%to2%bymassfornitrogen.1.3Thenitrogentestmethodisnotapplicabletolightmaterialsorthosecontaining<0.75%bymassnitrogen,orboth,suchasgasoline,jetfuel,naphtha,dieselfuel,orchemicalsolvents.1.3.1However,usingTestMethodDlevelsof0.1%bymassnitrogeninlubricantscouldbedetermined.1.4Thesetestmethodsarenotrecommendedfortheanaly-sisofvolatilematerialssuchasgasoline,gasoline-oxygenateblends,orgasolinetypeaviationturbinefuels.1.5Theresultsofthesetestscanbeexpressedasmass%carbon,hydrogenornitrogen.1.6ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.7Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.8Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTec...
