Designation:E2330−12StandardTestMethodforDeterminationofConcentrationsofElementsinGlassSamplesUsingInductivelyCoupledPlasmaMassSpectrometry(ICP-MS)forForensicComparisons1ThisstandardisissuedunderthefixeddesignationE2330;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Oneobjectiveofaforensicglassexaminationistocompareglasssamplestodetermineiftheycanbediscrimi-natedusingtheirphysical,opticalorchemicalproperties(forexample,color,refractiveindex(RI),density,elementalcom-position).Ifthesamplesaredistinguishableinanyoftheseobservedandmeasuredproperties,itmaybeconcludedthattheydidnotoriginatefromthesamesourceofbrokenglass.Ifthesamplesareindistinguishableinalloftheseobservedandmeasuredproperties,thepossibilitythattheyoriginatedfromthesamesourceofglasscannotbeeliminated.Theuseofanelementalanalysismethodsuchasinductivelycoupledplasmamassspectrometryyieldshighdiscriminationamongsourcesofglass.1.2Thistestmethodcoversaprocedureforquantitativedeterminationoftheconcentrationsofmagnesium(Mg),alu-minum(Al),iron(Fe),titanium(Ti),manganese(Mn),ru-bidium(Rb),strontium(Sr),zirconium(Zr),barium(Ba),lanthanum(La),cerium(Ce),neodymium(Nd),samarium(Sm),andlead(Pb)inglasssamples.1.3Thisprocedureisapplicabletoirregularlyshapedsamplesassmallas200micrograms,forthecomparisonoffragmentsofaknownsourcetotherecoveredfragmentsfromaquestionedsource.Theseelementsarepresentinsodalimeandborosilicateglassinppbto%levels1.4Thisprocedureisapplicabletootherelements,othertypesofglass,andotherconcentrationrangeswithappropriatemodificationsofthedigestionprocedure(ifneededforfullrecoveryoftheadditionalelements),calibrationstandardsandthemassspectrometerconditions.Calciumandpotassium,forexample,couldbeaddedtothelistofanalytesinamodifiedanalysisscheme.Alternativemethodsforthedeterminationofconcen...
