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Caractérisation d’une nouvelle voie de formation des aérosols organiques secondaires (AOS) dans l’atmosphère : rôle des précurseurs polyaromatiques

Abstract : This work deals with the secondary organic aerosol (SOA) formation from gas phase oxidation of volatile organic compounds in the presence of atmospheric oxidants (ozone, hydroxyl radical, chlorine and nitrate radical). Among them, polycyclic aromatic hydrocarbons (PAHs) have been proposed as an important potential source of anthropogenic SOA. The oxidation of 4 main gaseous PAHs (naphthalene, acenaphthylene, acenaphthene and phenanthrene) in the presence of main atmospheric oxidants has been performed in order to investigate the SOA formation. Characterization of both gas and particulate phases has been carried out using mass spectrometry and optical spectroscopy allowing the identification of products in both phases. Then, chemical mechanisms have been proposed in order to explain SOA formation. SOA yields have been also determined to evaluate the impact of the gas phase oxidation of PAHs in SOA formation. Experiments have been carried out using flow tube and atmospheric simulation chambers. SOA fate has been investigated to determine the different oxidation processes involved in SOA aging.
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Matthieu Riva. Caractérisation d’une nouvelle voie de formation des aérosols organiques secondaires (AOS) dans l’atmosphère : rôle des précurseurs polyaromatiques. Autre. Université Sciences et Technologies - Bordeaux I, 2013. Français. ⟨NNT : 2013BOR14942⟩. ⟨tel-00952636⟩

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