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Discussion papers | Copyright
https://doi.org/10.5194/amt-2018-116
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 28 May 2018

Research article | 28 May 2018

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This discussion paper is a preprint. A revision of the manuscript is under review for the journal Atmospheric Measurement Techniques (AMT).

Size Resolved Online Chemical Analysis of Nano Aerosol Particles: A Thermal Desorption Differential Mobility Analyzer Coupled to a Chemical Ionization Time Of Flight Mass Spectrometer

Andrea C. Wagner1, Anton Bergen1, Sophia Brilke1,2, Claudia Fuchs1,3, Markus Ernst1, Jesica Hoker1, Martin Heinritzi1, Mario Simon1, Bertram Bühner1, Joachim Curtius1, and Andreas Kürten1 Andrea C. Wagner et al.
  • 1Institute for Atmospheric and Environmental Sciences, Goethe University Frankfurt, Frankfurt, 60438, Germany
  • 2Aerosol Physics and Environmental Physics, University of Vienna, Vienna, 1090, Austria
  • 3Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, Villigen, 5232, Switzerland

Abstract. A new method for size resolved chemical analysis of nucleation mode aerosol particles (size range from ~10 to ~30nm) is presented. The Thermal Desorption Differential Mobility Analyzer (TD-DMA) uses an online, discontinuous principle. The particles are charged, a specific size is selected by differential mobility analysis and they are collected on a filament by electrostatic precipitation. Subsequently, the sampled mass is evaporated in a clean carrier gas and analyzed by a chemical ionization mass spectrometer. Gas phase measurements are performed with the same mass spectrometer during the sampling of particles. The characterization shows reproducible results, with a particle size resolution of 1.19 and the transmission efficiency for 15nm particles being slightly above 50%. The signal from the evaporation of a test substance can be detected starting from 0.01ng and shows a linear response in the mass spectrometer. Instrument operation in the range of pg/m3 is demonstrated by an example measurement of 15nm particles produced by nucleation from dimethylamine, sulfuric acid and water.

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A new method for size resolved chemical analysis of nucleation mode aerosol particles (size range from ~ 10 to ~ 30 nm) is presented. The Thermal Desorption Differential Mobility Analyzer (TD-DMA) uses an online discontinuous principle. The particles are charged, size selected and electrostatically collected. The sampled mass is evaporated to be analyzed by a chemical ionization mass spectrometer. Gas phase measurements with the same mass spectrometer are taken during the sampling of particles.
A new method for size resolved chemical analysis of nucleation mode aerosol particles (size...
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