Designation:D7796−21StandardTestMethodforAnalysisofEthyltert-ButylEther(ETBE)byGasChromatography1ThisstandardisissuedunderthefixeddesignationD7796;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversthedeterminationofthepurityofethyltert-butylether(ETBE)bygaschromatography.ItalsoprovidesaproceduretomeasureimpuritiesinETBEsuchasC4toC12olefins,methyl,isopropylandtert-butylalcohols,methylsec-butylandmethyltert-amylethers,acetone,andmethylethylketone.1.2ThistestmethodisnotapplicabletothedeterminationofETBEingasoline.1.3WatercannotbedeterminedbythistestmethodandshallbemeasuredbyaproceduresuchasTestMethodD6304andtheresultusedtonormalizethechromatographicvalues.1.4MostoftheimpuritiesinETBEareresolvedbythetestmethod,however,someco-elutionisencountered.1.5Thistestmethodisinappropriateforimpuritiesthatboilattemperatureshigherthan180°Corforimpuritiesthatcausepoorornoresponseinaflameionizationdetector,suchaswater.1.6ThevaluesstatedinSIunitsofmeasurementarepreferredandusedthroughoutthestandard.Alternateunits,incommonusage,arealsoprovidedtoimproveclarityandaidtheuserofthistestmethod.1.7Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.8Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D3700PracticeforObtainingLPGSamplesUsingaFloat-ingPistonCylinderD4057PracticeforManualSampli...
