Caractérisation par désorption / ionisation laser couplée à la spectrométrie de masse de particules émises par des véhicules diesel : mise en place d'une méthode impliquant la formation de complexes à transfert de charge

Abstract : Polycyclic aromatic hydrocarbons (PAHs) are often associated to complex matrices, as for example exhaust diesel particulate matter (DPM). We choose to use laser desorption/ionization Fourier transform ion resonance cyclotron mass spectrometry (LDI-FTICRMS). The deposit of complexing agent directly on a sampling filter leads to the formation of charge transfer (C-T) with PAHs absorbed on DPM and limits their sublimation during analysis. The laser irradiation at short wavelength (222 nm) and low laser power density (5106 W.cm-2) of these so-prepared samples allows PAH molecular ion production to be dramatically increased. This methodology has been applied for the first time to different kinds of particulate matter. These exhaust particles are collected on a standard chassis dynamometer according to the different parts of the new European driving cycle (NEDC) define for light-duty by the economic commission for Europe (urban driving condition with cold start or warm engine, and extra urban driving conditions). The influence of engine temperature, driving conditions and fuel PAH and sulfur contents on PAHs patterns of DPM has been highlighted. Collaboration with the LCSR laboratory (Orléans) was also conducted to investigated model soot particles produced in a shock tube with various precursors representative to the different chemical compounds present in gasoline. Strong correlation between the nature of precursor and the soot particle fingerprint is observed. Soot particles produced by aromatic precursor (toluene) present a specific PAH pattern, which is characterized by a less detection of heavy compounds.
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Vincent Carré. Caractérisation par désorption / ionisation laser couplée à la spectrométrie de masse de particules émises par des véhicules diesel : mise en place d'une méthode impliquant la formation de complexes à transfert de charge. Autre [cond-mat.other]. Université Paul Verlaine - Metz, 2003. Français. ⟨NNT : 2004METZ003S⟩. ⟨tel-01750254⟩

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