Designation:D4779–93StandardTestMethodforTotal,Organic,andInorganicCarboninHighPurityWaterbyUltraviolet(UV)orPersulfateOxidation,orBoth,andInfraredDetection1ThisstandardisissuedunderthefixeddesignationD4779;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationoftotalcarbon(TC),organiccarbon(OC),andinorganiccarbon(IC),inmakeupwaterandhighpurityprocesswatersuchasdemineralizereffluent,condensate,andelectronicgraderinsewater.Thetestedconcentrationrangeisfrom50to1000µgofcarbonperlitre.1.2Itistheuser’sresponsibilitytoensurethevalidityofthistestmethodforwatersofuntestedmatrices.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyproblems,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:D1129TerminologyRelatingtoWater2D1192SpecificationforEquipmentforSamplingWaterandSteaminClosedConduits2D1193SpecificationforReagentWater2D2777PracticeforDeterminationofPrecisionandBiasofApplicableMethodsofCommitteeD-19onWater2D3370PracticesforSamplingWaterfromClosedCon-duits23.Terminology3.1Definitions—Fordefinitionsoftermsusedinthistestmethod,refertoTerminologyD1129.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1inorganiccarbon(IC)—carbonintheformofcarbondioxide,carbonateion,orbicarbonateion.3.2.2organiccarbon(OC;frequentlyalsoTOC)—carbonintheformoforganiccompounds.3.2.3totalcarbon(TC)—thesumofinorganicandorganiccarbon.4.SummaryofTestMethod4.1Fortotalcarbonmeasurement,sampleisinjectedintoagas-spargedreactorcontainingacidifiedpotassiumpersulfate(K2S2O8)orsodiumpersulfate(Na2S2O8)solution;eitherelevatedtemperatureorultraviolet(UV)radiationisusedtoenhancetheoxidation.Bot...
