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A rapid and reliable method for Pb isotopic analysis of peat and lichens by laser ablation-quadrupole-inductively coupled plasma-mass spectrometry for biomonitoring and sample screening
Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
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2007 (Swedish)In: Analytica Chimica Acta, Vol. 582, no 1, 116-124 p.Article in journal (Other (popular science, discussion, etc.)) Published
Abstract [sv]

An analytical protocol for rapid and reliable laser ablation-quadrupole (LA-Q)- and multi-collector (MC-) inductively coupled plasma-mass spectrometry (ICP-MS) analysis of Pb isotope ratios (207Pb/206Pb and 208Pb/206Pb) in peats and lichens is developed. This technique is applicable to source tracing atmospheric Pb deposition in biomonitoring studies and sample screening. Reference materials and environmental samples were dry ashed and pressed into pellets for introduction by laser ablation. No binder was used to reduce contamination. LA-MC-ICP-MS internal and external precisions were <1.1% and <0.3%, respectively, on both 207Pb/206Pb and 208Pb/206Pb ratios. LA-Q-ICP-MS internal precisions on 207Pb/206Pb and 208Pb/206Pb ratios were lower with values for the different sample sets <14.3% while external precisions were <2.9%. The level of external precision acquired in this study is high enough to distinguish between most modern Pb sources. LA-MC-ICP-MS measurements differed from thermal ionisation mass spectrometry (TIMS) values by 1% or less while the accuracy obtained using LA-Q-ICP-MS compared to solution MC-ICP-MS was 3.1% or better using a run bracketing (RB) mass bias correction method. Sample heterogeneity and detector switching when measuring 208Pb by Q-ICP-MS are identified as sources of reduced analytical performance.

Place, publisher, year, edition, pages
2007. Vol. 582, no 1, 116-124 p.
Keyword [en]
Laser ablation, Pb isotope, Environmental monitoring, Multi-collector, Biological sample, Peat, Lichen
URN: urn:nbn:se:su:diva-21864DOI: doi:10.1016/j.aca.2006.08.050OAI: diva2:188391
Available from: 2007-12-17 Created: 2007-12-17 Last updated: 2011-01-11Bibliographically approved

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