Stuttgart 2012 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 7: Accelerator Mass Spectrometry and Applications I
MS 7.7: Vortrag
Donnerstag, 15. März 2012, 12:15–12:30, V57.06
Technical requirements for 14C analysis of airborne particulate matter — •Sönke Szidat1, Yanlin Zhang1,2, Peter Zotter2, André Prévôt2, and Lukas Wacker3 — 1Universität Bern, Departement für Chemie und Biochemie & Oeschger-Zentrum für Klima- und Klimafolgenforschung, Bern, Schweiz — 2Paul Scherrer Institut (PSI), Villigen, Schweiz — 3ETH Zürich, Labor für Ionenstrahlphysik, Zürich, Schweiz
Carbonaceous aerosols are a major fraction of airborne particulate matter. They contribute to climate and health effects of the total aerosol burden of the atmosphere by counteracting the current trend of global warming and inducing respiratory and cardiovascular diseases, respectively. In spite of this general importance, only little is known about composition and sources of carbonaceous aerosols. Analysis of the long-lived radioactive isotope 14C is a unique source apportionment tool, as it unambiguously separates fossil from non-fossil sources. However, 14C analysis of carbonaceous aerosols involves two major drawbacks. First, sample masses amount typically <0.05 mgC and sometimes even <0.01 mgC. Second, various fractions of the carbonaceous aerosol may originate from distinctly different sources, which makes subsampling of individual portions for 14C measurement necessary. This work presents strategies of optimized sample preparation and 14C analysis based on a MICADAS accelerator mass spectrometer with a gas ion source.