Designation:D4735−15StandardTestMethodforDeterminationofTraceThiopheneinRefinedBenzenebyGasChromatography1ThisstandardisissuedunderthefixeddesignationD4735;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversthedeterminationofthiopheneinrefinedbenzeneintherangefrom0.80to1.80mg/kgfortheFlamePhotometricDetector(FPD),andfrom0.14to2.61mg/kgforthePulsedFlamePhotometricDetector(PFPD).ForthePFPD,theminimumlevelofquantitation(LOQ)is0.14mg/kgandtheminimumlevelofdetection(LOD)is0.04mg/kg,asdescribedinASTMResearchReportRR:D16-1038.2Therangeofthetestmethodmaybeextendedbymodifyingthesampleinjectionvolume,splitratios,calibrationrange,orsampledilutionwiththiophene-freesolvent.1.2ThistestmethodhasbeenfoundapplicabletobenzenecharacteristicofthetypedescribedinSpecificationsD2359andD4734andmaybeapplicabletoothertypesorgradesofbenzeneonlyaftertheuserhasdemonstratedthattheprocedurecancompletelyresolvethiophenefromtheotherorganiccontaminantscontainedinthesample.1.3Thefollowingappliestoallspecifiedlimitsinthistestmethod:forpurposesofdeterminingconformancetoappli-cablespecificationusingthistestmethod,anobservedvalueoracalculatedvalueshallberoundedoff“tothenearestunit”inthelastright-handdigitusedinexpressingthespecificationlimitinaccordancewiththerounding-offmethodofPracticeE29.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Forspecifichazardstatements,seeSection7.2.ReferencedDocuments2.1ASTMStandards:3D1193SpecificationforReagentWaterD2359SpecificationforRefinedBenzene-535D3437PracticeforSamplingandHandlingLiq...
