Designation:D3257−06(Reapproved2012)StandardTestMethodsforAromaticsinMineralSpiritsbyGasChromatography1ThisstandardisissuedunderthefixeddesignationD3257;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thesetestmethodscoverthedeterminationofethylben-zeneandtotaleight-carbon(C8)andheavieraromaticsintheconcentrationrangefrom0.1to30%inmineralspiritshavingadistillationrangefrom149to210°C(300to410°F)asdeterminedbyTestMethodD86.Theprocedurespermittheidentificationandcalculationofconcentrationsofaromaticcomponentsto0.1volume%.1.2Itisrecognizedbyanalyticalchemiststhatasinglecolumngaschromatographyanalysisofanunknownsampleisrisky.Insuchcases,multipleanddifferentanalyticaltech-niquesmustbeusedforabsolutelypositiveidentification,forexample,severaldifferentgaschromatographycolumns,gaschromatography/massspectrometer,orgaschromatography/infrared,etc.Inthesetestmethodsthematerialisknownandisclearlydefined.1.3Oxygenatedcompounds,ifpresent,mayinterfereandcauseerroneousresults.Suchoxygenatedcompoundsarenotnormallypresentinmineralspirits.1.4Threetestmethodsarecoveredasfollows:1.4.1TestMethodA,measurementofethylbenzenecontent,C8plushigheraromatics(exceptethylbenzene),andtotalaromaticsbymeansofasinglepackedcolumngaschromato-graphicanalysis.1.4.2TestMethodB,measurementofethylbenzenecontentbymeansofarapidpackedcolumngaschromatographicanalysis.1.4.3TestMethodC,measurementofethylbenzenecontent,C8plushigheraromatics(exceptethylbenzene)andtotalaromaticsbymeansofacapillarycolumngaschromatographicanalysis.1.5ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.6Forpurposesofdeterminingconformanceofanob-servedoracalculatedvalueusingthistestmethodtoreleva...
