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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/amt-2019-406
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2019-406
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

  08 Nov 2019

08 Nov 2019

Review status
A revised version of this preprint was accepted for the journal AMT and is expected to appear here in due course.

Application of time-of-flight aerosol mass spectrometry for the real-time measurement of particle phase organic peroxides: An online redox derivatization – aerosol mass spectrometer (ORD-AMS)

Marcel Weloe and Thorsten Hoffmann Marcel Weloe and Thorsten Hoffmann
  • Department of Chemistry, Johannes Gutenberg University, Mainz, 55128, Germany

Abstract. Aerosol mass spectrometers (AMS) are frequently applied in atmospheric aerosol research in connection with climate, environmental or health related projects. This is also true for the measurement of the organic fraction of particulate matter, still the least understood group of components contributing to atmospheric aerosols. While quantification of the organic/inorganic aerosol fractions is feasible, more detailed information about individual organic compounds or compound classes can usually not be provided by AMS measurements. In this study we present a new method to detected organic peroxides in the particle phase in real-time using an AMS. Peroxides (ROOR') are of high interest to the atmospheric aerosol community due to their potentially high mass contribution to SOA, their important role in new particle formation and their function as ‘reactive oxygen species’ in aerosol-health-related topics. To do so, supersaturated gaseous triphenylphosphine (TPP) was continuously mixed with the aerosol flow of interest in a condensation/reaction volume in front of the AMS inlet. The formed triphenylphosphine oxide (TPPO) from the peroxide/TPP reaction was then detected by an aerosol mass spectrometer (AMS), enabling the quantitative determination of peroxide with a time resolution of one to two minutes. The method was tested with freshly formed and aged biogenic VOC/ozone SOA as well as in a short proof-of-principle study with ambient aerosol.

Marcel Weloe and Thorsten Hoffmann

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Marcel Weloe and Thorsten Hoffmann

Marcel Weloe and Thorsten Hoffmann

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Short summary
Aerosol mass spectrometers (AMS) are frequently applied in atmospheric aerosol research in connection with climate, environmental or health related projects. The paper describes a new real-time technique for the measurement of organic peroxides, which play an important role in new particle formation and as ‘reactive oxygen species’ in aerosol-health-related aspects of atmospheric aerosols.
Aerosol mass spectrometers (AMS) are frequently applied in atmospheric aerosol research in...
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