Designation:D7375−08StandardTestMethodforTraceQuantitiesofWaterinAromaticHydrocarbonsandTheirMixturesbyCoulometricKarlFischerTitration1ThisstandardisissuedunderthefixeddesignationD7375;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1ThistestmethoddescribestheuseoftheCoulometricKarlFischer(KF)titrationforthedeterminationofwaterinaromatichydrocarbonsandtheirmixtures,derivativesandrelatedchemicals.1.2Thistestmethodisapplicabletosampleswithwaterconcentrationsfrom10to400mg/kg.1.3Indeterminingtheconformanceofthetestresultsusingthismethodtoapplicablespecifications,resultsshallberoundedoffinaccordancewiththerounding-offmethodofPracticeE29.1.4ValuesstatedinSIunitsaretoberegardedasthestandard.Thepreferredunitsaremilligramsperkilogram(mg/kg).1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.ForaspecifichazardstatementseeSection8.2.ReferencedDocuments2.1ASTMStandards:2D1193SpecificationforReagentWaterD3437PracticeforSamplingandHandlingLiquidCyclicProductsD6809GuideforQualityControlandQualityAssuranceProceduresforAromaticHydrocarbonsandRelatedMa-terialsE29PracticeforUsingSignificantDigitsinTestDatatoDetermineConformancewithSpecificationsE203TestMethodforWaterUsingVolumetricKarlFischerTitration2.2OtherStandard:OSHARegulations,29CFRparagraphs1910and1910.120033.SummaryofTestMethod3.1IntheKarlFischerreaction,waterwillreactwithiodineinthepresenceofsulfurdioxide,alcoholandanorganicbaseaccordingtothefollowingequation:H2O1I21SO21CH3OH13RN→~RNH!SO4CH312~RNH!I(1)where:RN=organicbase.3.2Inthecoulometrictitrationtestmethod,thesampleisinjectedintoanelectrolyticcellwheretheiodinerequi...
