Designation:D4309−12StandardPracticeforSampleDigestionUsingClosedVesselMicrowaveHeatingTechniquefortheDeterminationofTotalMetalsinWater1ThisstandardisissuedunderthefixeddesignationD4309;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thispracticecoversthegeneralconsiderationsforquantitativesampledigestionfortotalmetalsinwaterusingclosedvesselmicrowaveheatingtechnique.Thispracticeisapplicabletosurface,saline,domestic,andindustrialwaste-water.1.2Becauseofthedifferencesamongvariousmakesandmodelsofsatisfactoryinstruments,nodetailedoperatingin-structionscanbeprovided.Instead,theanalystshouldfollowtheinstructionsprovidedbythemanufactureroftheparticularinstrument.1.3ThispracticecanbeusedwiththefollowingASTMstandards,providingtheuserdeterminesprecisionandbiasbasedonthisdigestionpractice:TestMethodD857,TestMethodsD858,TestMethodsD1068,TestMethodsD1687,TestMethodsD1688,TestMethodsD1691,TestMethodsD1886,TestMethodD1976,PracticesD3370,TestMethodsD3557,TestMethodsD3559,PracticeD3919,TestMethodD4190,PracticeD4453,PracticeD4691,andTestMethodD5673.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Forspecifichazardstatements,seeSection9.2.ReferencedDocuments2.1ASTMStandards:2D857TestMethodforAluminuminWaterD858TestMethodsforManganeseinWaterD1068TestMethodsforIroninWaterD1129TerminologyRelatingtoWaterD1193SpecificationforReagentWaterD1687TestMethodsforChromiuminWaterD1688TestMethodsforCopperinWaterD1691TestMethodsforZincinWaterD1886TestMethodsforNickelinWaterD1976TestMethod...
