Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 45, Issue 12, Pages 5238-5244Publisher
AMER CHEMICAL SOC
DOI: 10.1021/es200587z
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- ADEME
- INSU
- LEFE CHAT
- French Ministere de l'Ecologie, de l'Energie, du Developpement durable et de l'Amenagement du Territoire
- Agence National de le Recherche Scientifique (ANR)
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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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