Trace metal analysis in Arctic aerosols by an ICP-TOF-MS combined with an inductively heated vaporizer

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Kriews, M. , Lüdke, C. , Taubner, K. and Skole, J. (2006): Trace metal analysis in Arctic aerosols by an ICP-TOF-MS combined with an inductively heated vaporizer , Lecture, 39. Jahrestagung der Deutschen Gesellschaft für Massenspektrometrie gemeinsam mit dem 20. ICP-MS Anwendertreffen sowie dem 7. Symposium über Massenspektrometrische Verfahren der Elementspurenanalyse, 5-8 March, Mainz, Germany. .
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Two newly developed instruments were combined to analyze the trace metal content in size separated arctic aerosols during the measurement campaign ASTAR 2004 (Arctic Study of Tropospheric Aerosols, Clouds and Radiation 2004) at Spitsbergen in May/June 2004. The aim of this extensive aerosol measurement campaign was to obtain a database for model-calculations of arctic aeroaols which play an important role in the global climate change.Therefore, this project was centered on two aircraft measurement campaigns, scheduled from 2004 to 2005, addressing both aerosol and cloud measurements combined with ground-based and satellite observations.The sampling of aerosol particles was performed in a well known manner by impaction of the particles on cleaned graphite targets. By means of a cascade impactor eight size classes between 0.35 and 16.6 µm aerodynamic diameters were separated.To analyze the metal content in the aerosol particles the targets were rapidly heated up to 2700°C in an inductively heated vaporizer system (IHVS). An argon flow transports the vaporized sample material into the inductively coupled plasma (ICP) used as ionisation source for the time of flight mass spectrometer (TOF-MS).The simultaneous extraction of the ions from the plasma, as realized in the TOF instrument, allows to obtain the full mass spectrum of the sample during the vaporization pulse without any limitation in the number of elements detected. With optimized experimental parameters the element content in arctic aerosol particles was determined in a mass range between 7Li and 209Bi. Comparing the size distribution of the elemental content of the aerosol particles, two different meteorological situations were verified.For calibration acidified reference solutions were placed on the cleaned target inside the IHVS. The limits of detection (LOD) for the element mass on the target range between 2 and 200 pg for the elements studied, except Na, Mg, and Cr, which are influenced by high background.

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