Dérivés oxygénés et nitrés des hydrocarbures aromatiques polycycliques en phase particulaire : granulométrie et devenir dans l’atmosphère

Abstract : To better understand the source and fate in the atmosphere of PAH derivatives, two complementary approaches were used: laboratory reactivity experiments in controlled conditions and field studies. Reactivity studies were carried out by exposing natural ambient air particles to oxidants (O3, OH and NO2/O3). Large decays of PAHs were observed and B[a]P appeared as the most reactive. The formation of oxygenated PAHs (OPAHs) and nitrated PAHs (NPAHs) was showed. However, quantities formed were not sufficient to explain the total amount of PAHs that reacted, highlighting the formation of other compounds not detected in this work. Field campaigns were performed on two different sampling sites around Paris. Concentrations were 10 times higher at the traffic site than at the suburban one. OPAHs and PAHs major compounds were similar at both sites, in contrary to NPAHs. The traffic site was influenced by primary emissions, whereas high amounts of secondary species were quantified at the suburban site. Particle size distribution of OPAHs and NPAHs showed their strong association to the finest particles (Dp < 2.5 μm), highlighting the interest of their study considering sanitary impacts.
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Alexandre Albinet. Dérivés oxygénés et nitrés des hydrocarbures aromatiques polycycliques en phase particulaire : granulométrie et devenir dans l’atmosphère. Rapport Scientifique INERIS, 2013, 2012-2013, pp.50-51. ⟨ineris-01869462⟩

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