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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/amt-2019-159
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2019-159
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 08 May 2019

Research article | 08 May 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

Multi-scheme chemical ionization inlet (MION) for fast switching of reagent ion chemistry in atmospheric pressure chemical ionization mass spectrometry (CIMS) applications

Matti P. Rissanen1,2, Jyri Mikkilä3, Siddharth Iyer4, and Jani Hakala3 Matti P. Rissanen et al.
  • 1Department of Physicsand Institute for Atmospheric and Earth System Research, University of Helsinki, Helsinki, Finland
  • 2Aerosol Physics Laboratory, Physics Unit, Faculty of Engineering and Natural Sciences, Tampere University, Tampere, Finland
  • 3Karsa Ltd., A. I. Virtasen aukio 1, 00560 Helsinki, Finland
  • 4Department of Chemistry and Institute for Atmospheric and Earth System Research, University of Helsinki, Helsinki, Finland

Abstract. A novel chemical ionization inlet (Multi-scheme chemical IONization inlet, MION, Karsa Ltd, Helsinki, Finland) capable of fast switching between multiple reagent ion schemes is presented and its performance is demonstrated by measuring several known oxidation products from much studied cyclohexene and α-pinene ozonolysis systems, by applying consecutive bromide (Br) and nitrate (NO3) chemical ionization. Experiments were performed in flow tube reactors under atmospheric pressure and room temperature (22 °C) utilizing atmospheric pressure interface time-of-flight mass spectrometer (APi-ToF-MS, Tofwerk Ltd, Thun, Switzerland) as the detector. The application of complementary ion modes in probing the same steady-state reaction mixture enabled a far more complete picture of the detailed autoxidation process; the HO2 radical and the least oxidized reaction products were retrieved with Br ionization, whereas the highest oxidized reaction products were detected in the NO3 mode, directly informing on the first steps and on the ultimate end-point of oxidation, respectively. While chemical ionization inlets with multiple reagent ion capabilities have been reported previously, an application in which the charging of the sample occurs at atmospheric pressure with practically no sample pretreatment, and with the potential to switch the reagent ion scheme within a second time-scale, has not been introduced previously. Also, the ability of bromide ionization to detect highly-oxygenated organic molecules (HOM) from atmospheric autoxidation reactions has not been demonstrated prior to this investigation.

Matti P. Rissanen et al.
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Latest update: 26 May 2019
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Short summary
A novel chemical ionization methodology for rapid gas-phase environmental monitoring is presented. The usefulness of the new inlet design is demonstrated by measuring various aerosol precursor compounds that are present at very low concentrations by using two consecutive ionization schemes. This new inlet enables the detection of a wide range of compounds of interest with a minimum of effort and at a fast repetition rate.
A novel chemical ionization methodology for rapid gas-phase environmental monitoring is...
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