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Preprints
https://doi.org/10.5194/egusphere-2024-4073
https://doi.org/10.5194/egusphere-2024-4073
27 Jan 2025
 | 27 Jan 2025
Status: this preprint is open for discussion and under review for Atmospheric Chemistry and Physics (ACP).

Formation and composition of organic aerosols from the uptake of glyoxal on natural mineral dust aerosols: a laboratory study

Francesco Battaglia, Paola Formenti, Chiara Giorio, Mathieu Cazaunau, Edouard Pangui, Antonin Bergé, Aline Gratien, Thomas Bertin, Joël F. de Brito, Manolis N. Romanias, Vincent Michoud, Clarissa Baldo, Servanne Chevaillier, Gaël Noyalet, Philippe Decorse, Bénédicte Picquet-Varrault, and Jean-François Doussin

Abstract. The uptake of glyoxal on realistic submicron mineral dust aerosol particles from a natural soil (Gobi Desert) is investigated during experiments in a large simulation chamber, under variable experimental conditions of relative humidity, irradiation, and ozone concentrations. The uptake of glyoxal on the dust particles starts as soon as the glyoxal is injected in the chamber. At 80 % RH, the measured uptake coefficient of glyoxal on mineral dust is γ = (9 ± 5) × 10⁻³. The totality of the mass of reacting glyoxal is transformed in organic matter on the surface of the dust particles. The uptake of glyoxal is accompanied by the appearance marker peaks in the organic mass spectra and a persistent growth in the volume concentration of the dust particles. While the mass of the organic matter on the dust rapidly reverts to values prior to uptake, the organic composition of the dust is modified irreversibly. Glycolic and other organic acids but also oligomers are detected on the dust. At 80 % RH, compounds ranging from C4 to C10 are observed as oligomerization products of glyoxal mono- and di-hydrate forms. The study suggests that dust aerosols could play a very substantial role in the formation of organic aerosols at high relative humidity, but also that the reaction could have potential important implications for the dust optical and hygroscopic properties, including their pH.

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This paper presents an experimental investigation of the interactions between glyoxal, an...
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