Preprints
https://doi.org/10.5194/amt-2022-168
https://doi.org/10.5194/amt-2022-168
 
02 Jun 2022
02 Jun 2022
Status: this preprint is currently under review for the journal AMT.

On the development of a new prototype PTR-ToF-MS instrument and its application to the detection of atmospheric amines

Alexander Håland1,2, Tomáš Mikoviny1, Elisabeth Emilie Syse1, and Armin Wisthaler1,2 Alexander Håland et al.
  • 1Department of Chemistry, University of Oslo, Oslo, Norway
  • 2Centre for Biogeochemistry in the Anthropocene (CBA), University of Oslo, Oslo, Norway

Abstract. We herein report on the development of a new prototype PTR-ToF-MS instrument that combines a hollow cathode glow discharge (HCGD) ion source with a focusing ion-molecule reactor (FIMR), which consists of a resistive glass drift tube surrounded by quadrupole rods. The new instrument configuration hybridizes the two main current commercial PTR-ToF-MS instrument designs. We provide a detailed technical description of the new analyzer and its optimized operational settings for detecting volatile amines via proton transfer reactions from hydronium (H3O+) or ammonium (NH4+) ions. We show that the new prototype PTR-ToF-MS instrument is capable of monitoring rapid changes of sticky amines on the timescale of a few seconds and detects atmospheric variations of amines down to single digit pptV levels. Application examples given include the real-time monitoring of i) methylamine emitted from a Chenopodium vulvaria L. plant, ii) small alkylamines in ambient air on site of an agricultural research center (Senter for husdyrforsøk, Ås, Norway), and iii) an industrial amine (2-amino-2-methylpropan-1-ol, AMP) on site and downwind of a carbon dioxide (CO2) capture test center (Technology Centre Mongstad – TCM, Mongstad, Norway).

Alexander Håland et al.

Status: open (until 08 Jul 2022)

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Alexander Håland et al.

Alexander Håland et al.

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Short summary
PTR-MS is widely used in atmospheric sciences for the detection of non-methane organic trace gases. The two most widely used types of PTR-MS instruments differ in their ion source and drift tube design. We herein present a new prototype PTR-MS instrument that hybridizes these designs and combines a conventional hollow cathode glow discharge ion source with a focusing ion-molecule reactor. We also show how this new instrument performs in detecting atmospheric amines.