Designation:D7871−18StandardTestMethodforAnalysisofCyclohexanebyGasChromatography(EffectiveCarbonNumber)1ThisstandardisissuedunderthefixeddesignationD7871;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversthedeterminationofthepurityofcyclohexanebygaschromatography.1.2ThistestmethodhasbeenfoundapplicabletothemeasurementofimpuritiessuchasthosefoundinTable1,whichareimpuritiesthatmaybefoundincyclohexane.Theimpuritiescanbeanalyzedoverarangeof1to400mg/kgbythismethod,butmaybeapplicabletoawiderrange.1.3Thelimitofdetectionis1mg/kg.1.4Indeterminingtheconformanceofthetestresultsusingthistestmethodtoapplicablespecifications,resultsshallberoundedoffinaccordancewiththerounding-offmethodofPracticeE29.1.5ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.Forspecifichazardsstatements,seeSection8.1.7Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D3437PracticeforSamplingandHandlingLiquidCyclicProductsD4790TerminologyofAromaticHydrocarbonsandRelatedChemicalsD6809GuideforQualityControlandQualityAssuranceProceduresforAromaticHydrocarbonsandRelatedMa-terialsE29PracticeforUsingSignificantDigitsinTestDatatoDetermineConformancewithSpecificationsE355PracticeforGasChromatographyTermsand...
