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Application of Time-of-Flight Aerosol Mass Spectrometry for the Online Measurement of Gaseous Molecular Iodine

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    Application of Time-of-Flight Aerosol Mass Spectrometry for the Online Measurement of Gaseous Molecular Iodine
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    † Institute of Inorganic and Analytical Chemistry, Johannes Gutenberg-University of Mainz, Duesbergweg 10-14, 55128 Mainz
    ‡ School of Physics, Centre for Climate and Air Pollution Studies, National University of Ireland, Galway, University Road, Galway, Ireland
    § Faculty of Science, Leiden/Amsterdam Center for Drug Research, Analytical BioSciences
    *E-mail: [email protected]. Phone: 0049 6131 3925716. Fax: 0049 6131 3925336.
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    Analytical Chemistry

    Cite this: Anal. Chem. 2012, 84, 3, 1439–1445
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    https://doi.org/10.1021/ac202527a
    Published December 15, 2011
    Copyright © 2011 American Chemical Society
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    Abstract

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    Here we present a new application of a time-of-flight aerosol mass spectrometer (TOF-AMS) for the measurement of atmospheric trace gases in real-time. Usually, TOF-AMS instruments are not sensitive to gas-phase species due to the aerodynamic particle focusing inlet system which reduces the gas phase species by a factor of about 107 relative to the particle phase. This efficient removal of the gas phase and the resulting high relative enrichment of particles is one reason for the very high sensitivity of TOF-AMS instruments for particle phase compounds (detection limits in the sub-μg/m3-range for online measurements with 1 min integration time), which allows application of the instruments even under clean atmospheric conditions. Here we use artificially generated particles as sampling probes to transfer selected atmospheric trace gases into the particle phase before entering the AMS (gaseous compound trapping in artificially generated particles-AMS, GTRAP-AMS). The sampling probe particles are mixed with the gaseous analytes upstream of the TOF-AMS in a 0.5 L flow tube. As an exemplary application of the method, the measurement of trace levels of gaseous molecular iodine is demonstrated. α-Cyclodextrin (α-CD/NH4Br) particles are used as selective sampling probes to transfer molecular iodine into the AMS. A detection limit in the subparts-per-billion (sub-ppb) range was achieved. The method was compared to a recently developed off-line method that combines denuder sampling of gaseous I2 and gas chromatography/mass spectrometry (GC/MS) analysis. To demonstrate the usability of the method, temporally resolved I2 emission profiles from a brown algae species (Laminaria saccharina) under exposure of ambient ozone levels were investigated. Total I2 release rates of 36.5 pmol min–1 grams fresh weight (gFW)−1 at 100 pbb O3 and 33.4 pmol min–1 gFW–1 at 50 ppb O3 were obtained within the first hour of ozone exposure.

    Copyright © 2011 American Chemical Society

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    This article is cited by 11 publications.

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    3. J. Hoker, F. Obersteiner, H. Bönisch, A. Engel. Comparison of GC/time-of-flight MS with GC/quadrupole MS for halocarbon trace gas analysis. Atmospheric Measurement Techniques 2015, 8 (5) , 2195-2206. https://doi.org/10.5194/amt-8-2195-2015
    4. Frithjof C. Küpper, Peter M.H. Kroneck. Iodine Bioinorganic Chemistry. 2014, 555-589. https://doi.org/10.1002/9781118909911.ch32
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    Analytical Chemistry

    Cite this: Anal. Chem. 2012, 84, 3, 1439–1445
    Click to copy citationCitation copied!
    https://doi.org/10.1021/ac202527a
    Published December 15, 2011
    Copyright © 2011 American Chemical Society
    Request reuse permissions

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