Analytical Chemistry · 2015 · 117 citations · 48 references
Natural SciencesChemistryEnvironmental SciencesAnalytical ChemistryEnvironmental ChemistryMass Spectrometric AnalysisAccurate Mass MeasurementEnvironmental AnalysisEnvironmental Analytical ChemistryEnvironmental Elemental AnalysisHeavy Metal ContaminationMass SpectrometryAnalytical Detection Of Heavy MetalsExternal CalibrationHeavy Metal DetectionHeavy Metal Ion DetectionMethod Detection LimitReference MaterialsSpeciation In Environmental SamplesStandard Reference Materials
A novel and sensitive approach for the accurate and precise determination of Pb in environmental samples is presented using transition metal ion-assisted photochemical vapor generation (PVG) for sample introduction with multicollector inductively coupled plasma mass spectrometry (MC-ICPMS) detection. A significant improvement in PVG efficiency of lead is achieved in the presence of transition metal ions (Co(2+) and Ni(2+)) in solutions of 5% (v/v) formic acid. The determination of Pb in digests of sediment or soil samples is readily achieved due to coexisting transition metal ions which facilitate the PVG reaction. The method detection limit of 0.005 ng g(-1) (3σ) using external calibration is comparable to that obtained using hydride generation (HG) ICPMS. However, PVG methodology is simpler, results in lower blanks, and avoids unstable reagents. The accuracy of the proposed method was demonstrated by analysis of several environmental certified reference materials (CRMs; SLRS-5 and SRM1640a river water CRMs and MESS-3, MESS-4, and SRM2702 sediments) with satisfying results. High precision of determination (<0.4% RSD) of Pb in river water and sediments was realized on the basis of isotope dilution calibration.
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Isotopic evidence for the source of lead in Greenland snows since the late 1960s
K.J.R. Rosman, W. Chisholm, Claude F. Boutron et al. · Nature · 1993 · 211 citations