Designation:D8404−21StandardPracticeforPreparationofSoilSamplesbyAmmoniumBifluoride-NitricAcidDigestionforSubsequentAnalysisforMetalsandMetalloids1ThisstandardisissuedunderthefixeddesignationD8404;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoversdrying,homogenization,andam-moniumbifluoride-nitricaciddigestionofsoilsamplesandassociatedqualitycontrol(QC)samplesforthedeterminationofmetalsandmetalloidsusinglaboratoryatomicspectrometryanalysistechniquessuchasinductivelycoupledplasmamassspectrometry(ICP-MS),inductivelycoupledplasmaatomicemissionspectrometry(ICP-AES),flameatomicabsorptionspectrometry(FAAS),andgraphitefurnaceatomicabsorptionspectrometry(GFAAS).Forammoniumbifluoride-nitricaciddigestionofairbornedustanddust-wipesamplesforthedeterminationofmetalsandmetalloids,seePracticeD8344.1.2ThispracticeisbasedonU.S.EPASW846,TestMethod3050,TestMethodD7202,andPracticeD8344.1.3Thispracticecontainsnotesthatareexplanatoryandarenotpartofthemandatoryrequirementsofthisstandard.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesafterSIunitsareprovidedforinformationonlyandarenotconsideredstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.6Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D653TerminologyRelatingtoSoil,Rock,andContainedFluid...
