Designation:E2927−13StandardTestMethodforDeterminationofTraceElementsinSoda-LimeGlassSamplesUsingLaserAblationInductivelyCoupledPlasmaMassSpectrometryforForensicComparisons1ThisstandardisissuedunderthefixeddesignationE2927;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.INTRODUCTIONOneobjectiveofaforensicglassexaminationistocompareglasssamplestodetermineiftheycanbediscriminatedusingtheirphysical,opticalorchemicalproperties(forexample,color,refractiveindex(RI),density,elementalcomposition).Ifthesamplesaredistinguishableinanyoftheseobservedandmeasuredproperties,itmaybeconcludedthattheydidnotoriginatefromthesamesourceofbrokenglass.Ifthesamplesareindistinguishableinalloftheseobservedandmeasuredproperties,thepossibilitythattheyoriginatedfromthesamesourceofglasscannotbeeliminated.Theuseofanelementalanalysismethodsuchaslaserablationinductivelycoupledplasmamassspectrometryyieldshighdiscriminationamongsourcesofglass.1.Scope1.1Thistestmethodcoversaprocedureforthequantitativeelementalanalysisofthefollowingseventeenelements:lithium(Li),magnesium(Mg),aluminum(Al),potassium(K),calcium(Ca),iron(Fe),titanium(Ti),manganese(Mn),rubidium(Rb),strontium(Sr),zirconium(Zr),barium(Ba),lanthanum(La),cerium(Ce),neodymium(Nd),hafnium(Hf)andlead(Pb)throughtheuseofLaserAblationInductivelyCoupledPlasmaMassSpectrometry(LA-ICP-MS)fortheforensiccomparisonofglassfragments.Thepotentialoftheseelementstoprovidethebestdiscriminationamongdifferentsourcesofsoda-limeglasseshasbeenpublishedelsewhere(1-5).2Silicon(Si)isalsomonitoredforuseasaninternalstandard.Additionalelementscanbeaddedasneeded,forexample,tin(Sn)canbeusedtomonitortheorientationoffloatglassfragments.1.2Themethodonlyconsumesapproximately0.4to2gofglassperreplicateandissuitablefortheanalysisoffullthicknesssamplesaswellasirregularlyshape...
