De l’importance des composés organiques nitrés dans l’atmosphère. Caractérisation moléculaire et études de sources en air ambiant

Abstract : A detailed study of the nitrogen content organic compounds in PM, including source apportionment, has been performed over a one-year period (2013) in Grenoble (France) as well as at the SIRTA station, representing the suburban background air quality conditions of the Paris area, during an intense PM pollution event in March 2015 (PM10 > 50 μg m-3 for several days). For Grenoble, the results obtained indicated that concentrations of nitro-PAHs (polycyclic aromatic hydrocarbons) were affected by secondary processes in summer but also in cold period under specific conditions, allowing for significant nitrate chemistry and secondary nitro-PAH formation processes. For the SIRTA dataset, a novel methodology has been developed and applied to refine the sources of organic aerosol (OA) combining dataset from ACSM (aerosol chemical speciation monitor) mass spectra and specific primary and secondary organic molecular markers from PM10 filters. The results showed the deconvolution of 10 OA factors including 3 primary OA (POA) and 7 secondary OA (biogenic and anthropogenic SOA) factors. The developed methodology allowed the clear identification of about half of the total SOA mass (75% of OA) observed during the sampling campaign and highlighted that 4 OA factors were linked to biomass burning emission with 2 primary sources (biomass burning OA (BBOA) and oxidized POA (OPOA)) and 2 secondary ones (from the oxidation of phenolic compounds and toluene). Furthermore, nitrated anthropogenic SOA, related to the oxidation of PAHs (characterized by nitro-PAHs), toluene, and phenolic compounds (methoxy-phenols), accounted for about 12% of total OA and exhibited a clear diurnal pattern with high concentrations during the night indicating the prominent role of night-time chemistry (nitrate radical). Future studies will focus on the organonitrate aerosol fraction starting by an intercomparison exercise of ACSM instruments end 2018 led by the ACMCC within the ACTRIS network activities.
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Alexandre Albinet, Olivier Favez, Deepchandra Srivastava, Sophie Tomaz. De l’importance des composés organiques nitrés dans l’atmosphère. Caractérisation moléculaire et études de sources en air ambiant. Rapport Scientifique INERIS, 2018, 2017-2018, pp.36-37. ⟨ineris-02044866⟩

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