Designation:D6144−22StandardTestMethodforAnalysisofAMS(α-Methylstyrene)byCapillaryGasChromatography1ThisstandardisissuedunderthefixeddesignationD6144;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1ThistestmethodcoversthedeterminationofthepurityofAMS(α-methylstyrene)bygaschromatography.Calibrationofthegaschromatographysystemisdonebytheexternalstandardcalibrationtechnique.1.2Thistestmethodhasbeenfoundapplicabletothemeasurementofimpuritiessuchascumene,3-methyl-2-cyclopentene-1-one,n-propylbenzene,tert-butylbenzene,sec-butylbenzene,cis-2-phenyl-2-butene,acetophenone,1-phenyl-1-butene,2-phenyl-2-propanol,trans-2-phenyl-2-butene,m-cymene,p-cymene,andphenol,whicharecommontothemanufacturingprocessofAMS.Themethodhasalsobeenfoundapplicableforthedeterminationofpara-tertiary-butylcatechol(TBCorPTBC)typicallyaddedasastabilizertoAMS.TheimpuritiesinAMScanbeanalyzedoverarangeof5to800mg/kgbythismethod.(SeeTable2.)BasedontheresultsinASTMResearchReportRR:D16-1022,summarizedinTable2,thelimitofquantitationfortheseimpuritiesaverages4mg/kg,whilethelimitofdetectionaverages1.2mg⁄kg.1.3Indeterminingtheconformanceofthetestresultsusingthismethodtoapplicablespecifications,resultsshallberoundedoffinaccordancewiththerounding-offmethodofPracticeE29.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisstandarddoesnotpurporttoaddressallthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafety,health,andenvironmentalpracticesanddeterminetheappli-cabilityofregulatorylimitationspriortouse.Forspecifichazardstatements,seeSection8.1.6Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononP...
