Peroxides on the Surface of Organic Aerosol Particles Using Matrix-Assisted Ionization in Vacuum (MAIV) Mass Spectrometry

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Yiming Qin
  • Véronique Perraud
  • Barbara J. Finlayson-Pitts
  • Lisa M. Wingen

Detail(s)

Original languageEnglish
Pages (from-to)14260-14268
Journal / PublicationEnvironmental Science and Technology
Volume57
Issue number38
Online published11 Sept 2023
Publication statusPublished - 26 Sept 2023
Externally publishedYes

Link(s)

Abstract

Organic peroxides are key intermediates in the atmosphere but are challenging to detect, especially in the particle phase, due to their instability, which has led to substantial gaps in the understanding of their environmental effects. We demonstrate that matrix-assisted ionization in vacuum (MAIV) mass spectrometry (MS), which does not require an ionization source, enables in situ characterization of peroxides and other products in the surface layers of organic particles. Hydroxyl radical oxidation of glutaric acid particles yields hydroperoxides and organic peroxides, which were detected with signals of the same order of magnitude as the major, more stable products. Product identification is supported by MS/MS analysis, peroxide standards, and offline high-resolution MS. The peroxide signals relative to the stable carbonyl and alcohol products are significantly larger using MAIV compared to those in the offline bulk analysis. This is also the case for analysis using fast, online easy ambient sonic-spray ionization mass spectrometry. These studies demonstrate the advantage of MAIV for the real-time characterization of labile peroxides in the surface layers of solid particles. The presence of peroxides on the surface may be important for surface oxidation processes as well as for the toxicity of inhaled particles. © 2023 The Authors. Published by American Chemical Society

Research Area(s)

  • heterogeneous oxidation, matrix-assisted ionization in vacuum (MAIV), OH oxidation, particle surface analysis, peroxides, peroxy radical self-reaction, “magic” ionization

Citation Format(s)

Peroxides on the Surface of Organic Aerosol Particles Using Matrix-Assisted Ionization in Vacuum (MAIV) Mass Spectrometry. / Qin, Yiming; Perraud, Véronique; Finlayson-Pitts, Barbara J. et al.
In: Environmental Science and Technology, Vol. 57, No. 38, 26.09.2023, p. 14260-14268.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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