Designation:D1687−17StandardTestMethodsforChromiuminWater1ThisstandardisissuedunderthefixeddesignationD1687;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thesetestmethodscoverthedeterminationofhexava-lentandtotalchromiuminwater.Section34onQualityControlpertainstothesetestmethods.Threetestmethodsareincludedasfollows:TestMethodConcentrationRangeSectionsA—PhotometricDiphenyl-carbohydrazide0.01to0.5mg/L7–15B—AtomicAbsorption,Direct0.1to10mg/L16–24C—AtomicAbsorption,GraphiteFurnace5to100µg/L25–331.2TestMethodAisaphotometricmethodthatmeasuresdissolvedhexavalentchromiumonly.Hexavalentchromiumcanalsobedeterminedbyionchromatography,seeTestMethodD5257.TestMethodsBandCareatomicabsorptionmethodsthataregenerallyapplicabletothedeterminationofdissolvedortotalrecoverablechromiuminwaterwithoutregardtovalencestate.ICP-MSorICP-AESmayalsobeappropriatebutatahigherinstrumentcost.SeeTestMethodsD5673andD1976.1.3TestMethodAhasbeenusedsuccessfullywithreagentgradewaterTypesI,II,andIII,tapwater,10%NaClsolution,treatedwaterfromasyntheticorganicindustrialplantthatmeetsNationalPollutionDischargeEliminationSystem(NPDES)permitrequirements,andEPA-extractionprocedureleachatewater,processwater,lakewater,effluenttreatment,thatis,limeneutralizationandprecipitationofspentpickleliquorandassociatedrinsewaterfromstainlesssteelpickling.TestMethodChasbeenusedsuccessfullywithreagentwater,stockscrubberwater,lakewater,filteredtapwater,riverwater,wellwater,productionplantwater,andacondensatefromamediumBTUcoalgasificationprocess.Matricesused,exceptforreagentwater,arenotavailableforTestMethodB.Itistheuser’sresponsibilitytoensurethevalidityofthesetestmethodsforwatersofuntestedmatrices.1.4ThevaluesstatedinSIunitsaret...
