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Oxidation of Atmospheric Humic Like Substances by Ozone: A Kinetic and Structural Analysis Approach

Abstract : This work explores the heterogeneous reaction between HUmic-LIke Substances (so-called HULIS) and ozone. Genuine atmospheric HULIS were extracted from aerosol samples collected in Chamonix (France) in winter and used in coated flow tube experiments to evaluate heterogeneous uptake of O-3 on such mixtures. The uptake coefficient (gamma) was investigated as a function of pH (from 2.5 to 10), O-3 concentration (from 8 to 33 x 10(11) molecules cm(-3)), relative humidity (20 to 65%) and photon flux (from 0 to 1.66 x 10(15) photons cm(-2) s(-1)). Reactive uptake was found to increase in the irradiated experiment with pH, humidity and photon flux. The extract was characterized before and after exposure to O-3 and/or UV light in the attempt to elucidate the effect of the photochemical aging. Carbon content measurements, UV-is spectroscopy and functional groups analysis revealed a decrease of the UV absorbance as well as of the carbon mass content, while the functionalization rate (COOH and C=O) and therefore the polarity increased during the simulated photochemical exposure.
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https://hal-insu.archives-ouvertes.fr/insu-00646131
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Submitted on : Tuesday, November 29, 2011 - 11:49:53 AM
Last modification on : Tuesday, December 14, 2021 - 8:34:02 AM

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C. Baduel, M. E. Monge, D. Voisin, J.-L. Jaffrezo, C. George, et al.. Oxidation of Atmospheric Humic Like Substances by Ozone: A Kinetic and Structural Analysis Approach. Environmental Science and Technology, American Chemical Society, 2011, 45 (12), pp.5238-5244. ⟨10.1021/es200587z⟩. ⟨insu-00646131⟩

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