Designation:D2907–97StandardTestMethodsforMicroquantitiesofUraniuminWaterbyFluorometry1ThisstandardisissuedunderthefixeddesignationD2907;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thesetestmethodscoverthedeterminationofmicro-quantitiesofuraniuminwaterintheconcentrationrangefrom0.005to50mg/L.1.2Theuraniumfluorescenceisquenchedbymanycationsandsomeanionsinthesample;itisenhancedbyafewcations.Ifinterferingionsarepresent,adirectfluorometricmeasure-mentisnotsuitable,andanextractionmethodshallbeusedtoprovideaccurateresults.Thetestmethodsandtheirconcen-trationrangesareasfollows:ConcentrationRange,mg/LSectionsTestMethodA—DirectFluorometric0.005to27to15TestMethodB—Extraction0.04to5016to241.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Forspecifichazards,seeNote1.2.ReferencedDocuments2.1ASTMStandards:D1066PracticeforSamplingSteam2D1129TerminologyRelatingtoWater2D1192SpecificationforEquipmentforSamplingWaterandSteam2D1193SpecificationforReagentWater2D3370PracticesforSamplingWater2E217TestMethodforUraniumbyControlled-PotentialCoulometry3E318TestMethodforUraniuminAqueousSolutionsbyColorimetry43.Terminology3.1Definitions—FordefinitionsoftermsusedinthesetestmethodsrefertoTerminologyD1129.4.SignificanceandUse4.1ThesetestmethodshavebeenreferencedintheNationalInterimPrimaryDrinkingWaterRegulations(Title40,Part141;FederalRegisterVol41,No.133,July1976)astheapprovedtestmethodsofanalysisforuraniuminwater.However,thefollowinglimitationofthesetestmethodsshouldbedulynotedwhenconsideringtheirusefordeterminingtheuraniumalph...
