Designation:D7458−21StandardTestMethodforDeterminationofBerylliuminSoilandSedimentUsingAmmoniumBifluorideExtractionandFluorescenceDetection1ThisstandardisissuedunderthefixeddesignationD7458;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodisintendedforuseinthedeterminationofberylliuminsamplesofsoilandsediment.Thistestmethodcanbeusedforpurposessuchasenvironmentalremediationprojectswhereberylliumisacontaminantofconcern.Itisalsousefulforcharacterizationoflevelsofberylliuminsoilatsiteswhereberylliumisinminingormanufacturingapplications,andfordeterminationofbackgroundlevelsofberylliuminsoil.1.2Thistestmethodassumesthatsamplesofsoilorsedimentarecollectedusingappropriateandapplicablemeth-ods.1.3Thistestmethodincludesaprocedureforextraction(dissolution)ofberylliumindiluteammoniumbifluoride,followedbyanalysisofaliquotsoftheextractsolutionusingaberyllium-specificfluorescentdye.1.4Fora500mgsample,thelowerlimitoftheworkingrangeisapproximately0.04mgBe/kg(5×dilution)or0.1mgBe/kg(20×dilution).Theworkingrangeextendstoconcen-trationsofatleast500mgBe/kg.1.5Nodetailedoperatinginstructionsareprovidedbecauseofdifferencesamongvariousmakesandmodelsofsuitablefluorometricinstruments.Instead,theanalystshallfollowtheinstructionsprovidedbythemanufactureroftheparticularinstrument.Thistestmethoddoesnotaddresscomparativeaccuracyofdifferentdevicesortheprecisionbetweeninstru-mentsofthesamemakeandmodel.1.6ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.7AllobservedandcalculatedvaluesshallconformtotheguidelinesforsignificantdigitsandroundingestablishedinPracticeD6026.1.7.1Forpurposesofcomparingameasuredorcalculatedvalue(s)withspecifiedlimits,themeasuredorcalculatedvalue(s)shallberoundedtothenearestdecimalofsignif...
