Designation:D6994−10StandardTestMethodforDeterminationofMetalCyanideComplexesinWastewater,SurfaceWater,GroundwaterandDrinkingWaterUsingAnionExchangeChromatographywithUVDetection1ThisstandardisissuedunderthefixeddesignationD6994;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversthedeterminationofthemetalcyanidecomplexesofiron,cobalt,silver,gold,copperandnickelinwatersincludinggroundwaters,surfacewaters,drink-ingwatersandwastewatersbyanionexchangechromatogra-phyandUVdetection.Theuseofalkalinesamplepreservationconditions(see10.3)ensuresthatallmetalcyanidecomplexesaresolubilizedandrecoveredintheanalysis(1-3).21.2Metalcyanidecomplexconcentrationsbetween0.20to200mg/Lmaybedeterminedbydirectinjectionofthesample.Thisrangewilldifferdependingonthespecificmetalcyanidecomplexanalyte,withsomeexhibitinggreaterorlesserdetec-tionsensitivitythanothers.Approximateconcentrationrangesareprovidedin12.1.Concentrationsgreaterthanthespecificanalyterangemaybedeterminedafterappropriatedilution.Thistestmethodisnotapplicableformatriceswithhighionicstrength(conductivitygreaterthan500meq/LasCl)andTDS(greaterthan30000mg/L),suchasoceanwater.1.3Metalcyanidecomplexconcentrationslessthan0.200mg/Lmaybedeterminedbyon-linesamplepreconcentrationcoupledwithanionexchangechromatographyasdescribedin11.3.Thisrangewilldifferdependingonthespecificmetalcyanidecomplexanalyte,withsomeexhibitinggreaterorlesserdetectionsensitivitythanothers.Approximateconcen-trationrangesareprovidedin12.1.Thepreconcentrationmethodisnotapplicableforsilverandcoppercyanidecom-plexesinmatriceswithhighTDS(greaterthan1000mg/L).1.4Thetestmethodmayalsobeappliedtothedetermina-tionofadditionalmetalcyanidecomplexes,suchasthoseofplatinumandpalladium.However,itistheresponsibilityoftheuserofthisstandardtoestab...
