Designation:D2712−20StandardTestMethodforDeterminationofHydrocarbonImpuritiesinHighPurityPropylenebyGasChromatography1ThisstandardisissuedunderthefixeddesignationD2712;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodisusedforthedeterminationofhydrocarbonimpuritiesinpropylene(propene)materialof97%bymassorgreaterpurity(concentrates).Theseimpuritiesaredeterminedintheconcentrationrangeof0.35mg⁄kgto8575mg/kgandincludesthefollowingcomponents:methane,ethane,ethylene,propane,acetylene,isobutane,propadiene,normalbutane,trans-2-butene,butene-1,isobutylene,cis-2-butene,isopentane,methylacetylene,normalpentane,and1,3-butadiene.NOTE1—Optionally,theanalysismayincludethedeterminationofpentenes/hexanesandheaviercomponents,see6.3.1.2Thistestmethoddoesnotdeterminenon-hydrocarbonimpurities,andadditionaltestsmaybenecessarytofullycharacterizethepropylenesample.However,forthepurposesofthistest,thepurityofpropyleneisdeterminedasthedifferencebetweenthetotalofthedeterminedanalytesand100%(bydifference).1.3Whenthistestmethodisbeingusedforthedetermina-tionoftracelevelimpuritiesinhigh-puritypropylene,theuseofthistestmethodfortheanalysisofpropylenesamplesatlowerpuritiesisnotrecommendedduetothepotentialforcrosscontaminationbetweensamples.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisstandardmayinvolvehazardousmaterials,operations,andequipment.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafety,health,andenvironmentalprac-ticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.1.6Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izati...
