Designation:D5794−95(Reapproved2014)StandardGuideforDeterminationofAnionsinCathodicElectrocoatPermeatesbyIonChromatography1ThisstandardisissuedunderthefixeddesignationD5794;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisguideisusedforthedeterminationofnitrateanioninelectrocoatbathpermeatebyuseofchemicallysuppressedandnon-suppressedionchromatography(IC).1.2Otheranions,withtheexceptionofphosphate,maybedeterminedinelectrocoatbathpermeatesbyuseofthisguide.1.3Itistheresponsibilityoftheuserofthisguidetoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D1193SpecificationforReagentWater3.SignificanceandUse3.1Itisimportanttomonitortheanionconcentrationsandanioncontaminantsinelectrocoatbaths.Wetchemicalmethodsarelong,tedious,andofquestionableaccuracyintheppmrange.Ionchromatographyoffersafast,convenientandaccuratealternative.SinceICanalysisofelectrocoatbathsamplesisdifficult,thepermeatesareoftenanalyzedforcontaminants.Thisguideaddressessomeimportantconsider-ationsforsuchanalyses.4.Apparatus4.1Awidevarietyofionchromatographycolumns,eluents,andoperatingparametersareavailablefromcommercialsources.Theroundrobinstudiesconductedinconjunctionwiththisguide’spreparationutilizedbothsuppressedandnon-suppressedICsystems,acidandbaseeluents,strongandweakbaseeluents,andvaryinggradientsandflowrates.Alllabora-toriesutilizedaconductivitydetectorfortheiranalysis.4.2AnyproperlymaintainedcommercialICsystemcapableofseparating,detecting,andquantifyinganionsbyconductiv-ityisdeemedsatisfactory.5.GuidelinesforAnalysts5.1UtilizecommerciallyavailableANIONstandardsorprepareanionstandardsfromreagentgradechemicalsandreagentwaterTypeI(seeSpecificationD1193).5.2Spargealleluentsolutionswithhe...
