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Caractérisation chimique de la fraction polaire des particules dans l’air ambiant

Abstract : Several studies on the toxicity of particles in ambient air show that the polar phase, which contains the oxygenated and nitrated polycyclic aromatic hydrocarbons (OPAHs and NPAHs), is more toxic than the aromatic fraction containing the PAH. In that context, the objective of our study was to chemically characterise the NPAHs and OPAHs in ambient air at various sites (traffic, urban, suburban, rural and altitude). Samplings were performed within the framework of the French research program POllution des Vallées Alpines (POVA) during the winter 2002-2003 and the summer 2003 and in the area of Marseilles in summer 2004. Both, ambient air particulate and gas phases were sampled and particle size distribution was also studied. The results obtained contribute to increase the data base on these compounds. First, we developed an analytical method for the simultaneous quantitative determination of NPAHs and OPAHs in complex environmental matrices, using GC/NICI-MS. Results from the field campaigns show that OPAH concentration levels were of the same order of magnitude as PAHs while NPAH concentrations were one to two orders of magnitude lower. The corresponding carcinogenic risk for NPAH was estimated using toxic equivalent factors (TEF). NPAHs could contribute to 20% of the total risk. No TEF were found for OPAH, which leaves entire the question of the risk they pose. Study of source specific ratios clearly showed that these compounds have a primary origin at the sites close to the sources of pollution whereas the production of secondary NPAHs by gas phase reactions was prevalent at the rural sites far from the direct sources of pollution and initiated by OH (daytime reactions). The study of NPAH and OPAH sources suggested that gasoline engines were an important source of such compounds. The OPAH 9,10-anthraquinone presents a double origin: primary diesel emission and photochemical processes. The fraction of PAHs, OPAHs and NPAHs associated with the particle phase was strongly depending on their vapour pressure and the ambient temperature. Sources of these compounds take a part in their gas/particle partitioning which can bring information on their primary or secondary origin. Finally, during both winter and summer, PAHs, OPAHs and NPAHs were mainly associated with fine particles (Dp<1.3 μm). The differences of chemical properties of the classes of compounds (polarity…) could account for their particle size distribution.
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  • HAL Id : ineris-01869199, version 1



Alexandre Albinet, Eva Leoz-Garziandia. Caractérisation chimique de la fraction polaire des particules dans l’air ambiant. Rapport Scientifique INERIS, 2008, 2007-2008, pp.62-64. ⟨ineris-01869199⟩



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