Designation:D5317−20StandardTestMethodforDeterminationofChlorinatedOrganicAcidCompoundsinWaterbyGasChromatographywithanElectronCaptureDetector1ThisstandardisissuedunderthefixeddesignationD5317;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversagaschromatographicproce-dureforthequantitativedeterminationofselectedchlorinatedacidsandotheracidicherbicidesinwater.Similarchemicalsmayalsobedeterminedbythistestmethod,butitistheuser’sresponsibilitytoverifytheapplicabilityofthistestmethodtoanycompoundsnotlistedinthisscope.Theacidformofthefollowingcompoundswereinterlaboratorytestedusingthistestmethod,andtheresultswerefoundacceptable:2AnalyteChemicalAbstractServicesRegistryNumberBentazon25057-89-02,4-D94-75-72,4-DB94-82-6DCPAacidmetabolites2Dicamba1918-00-93,5-Dichlorobenzoicacid51-36-5Dichlorprop120-36-55-Hydroxydicamba7600-50-2Pentachlorophenol(PCP)87-86-5Picloram1918-02-12,4,5-T93-76-52,4,5-TP(Silvex)93-72-11.2Thistestmethodmaybeapplicabletothedeterminationofsaltsandestersofanalytecompounds.Theformofeachacidisnotdistinguishedbythistestmethod.Resultsarecalculatedandreportedforeachlistedanalyteasthetotalfreeacid.1.3Thistestmethodhasbeenvalidatedinaninterlaboratorytestforreagentwaterandfinishedtapwater.TheanalystshouldrecognizethatprecisionandbiasreportedinSection18maynotbeapplicabletootherwaters.1.4Thistestmethodisrestrictedtousebyorunderthesupervisionofanalystsexperiencedintheuseofgaschroma-tography(GC)andintheinterpretationofgaschromatograms.Eachanalystmustdemonstratetheabilitytogenerateaccept-ableresultswiththistestmethodusingtheproceduredescribedin19.3.Itistheuser’sresponsibilitytoensurethevalidityofthistestmethodforwatersofuntestedmatrices.1.5Analytesthatarenotseparatedchromatographically,thatis,whichhaveverysimilarretentiontimes,can...
