Designation:D2504−88(Reapproved2015)StandardTestMethodforNoncondensableGasesinC2andLighterHydrocarbonProductsbyGasChromatography1ThisstandardisissuedunderthefixeddesignationD2504;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofhydrogen,nitrogen,oxygen,andcarbonmonoxideinthepartspermillionvolume(ppmv)rangeinC2andlighterhydrocarbonproducts.Thistestmethodshouldbeapplicabletolighthydrocarbonsotherthanethylene,butthetestprogramdidnotincludethem.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Forsomespecifichazardstatements,seetheAnnexA1.2.ReferencedDocuments2.1ASTMStandards:2D2505TestMethodforEthylene,OtherHydrocarbons,andCarbonDioxideinHigh-PurityEthylenebyGasChroma-tographyE260PracticeforPackedColumnGasChromatographyF307PracticeforSamplingPressurizedGasforGasAnaly-sis2.2OtherStandard:3CompressedGasAssociationBookletsG-4andG-4.1ontheuseofoxygen.3.SummaryofTestMethod3.1Thesampleisseparatedinagas-solidchromatographicsystemusingmolecularsievesasthesolidadsorbent.Theconcentrationofthegasestobedeterminediscalculatedfromtherecordedpeakheightsorpeakareas.Argoncanbeusedasacarriergasforthedeterminationofhydrogeninconcentra-tionsbelow100ppmv.Argon,ifpresentinthesample,interfereswithoxygendetermination.4.SignificanceandUse4.1Thepresenceoftraceamountsofhydrogen,oxygen,andcarbonmonoxidecanhavedeleteriouseffectsincertainpro-cessesusinghydrocarbonproductsasfeedstock.Thistestmethodissuitableforsettingspecifications,foruseasaninternalqua...
