Caractérisation organique et minérale des particules individuelles (aérosols) de l'environnement sidérurgique : étude des synergies entre la matière organique et la nature des espèces minérales en présence

Abstract : The aim of our work is organic and inorganic characterization of particular pollutants, mainly polycyclic aromatic hydrocarbons adsorbed on complex particles, released in the environment during the various stages of steel manufacturing. In the first part of this work, we describe the experimental methodology used to conduct this study. The basic methods used are gas chromatography with or not mass spectrometry and LAMMA 500 laser microprobe connected to a tunable dye laser. Using this last instrument, the analysis is carried out in two stages : a first laser shot with a very low energy desorbs the PAHs from its support. Then, a second high energy laser impact pulverizes the particle, giving organic or inorganic chemical informations on the nature of adsorption substrate. The results obtained reveal both the organic compounds desorbed from the particles as well as their constituant organic and (or) inorganic chemical components. These are essentially carbon matrices in samples collected in coke ovens and iron oxides in samples collected from blast furnaces. In the second part of this work, we tried to simulate the reactions of atmospheric transformations of solid PAHs adsorbed on various substrates using NO2 as the atmospheric polluant. The objective of this part of the ewperiment was to enable a greater understanding of the mechanisms involved in nitro-PAHs formation during its stay in the atmosphere or during collecting step. The results suggest than FTMS 2000 laser microprobe analysis, used in the desorption mode could detect high molecular weight compounds which are only partially recoverable using conventional analytical methods. In the last section, a theorical approach using semi-empirical calculations was conducted in order to confirm the experimental results regarding the reactions of some kind of PAHs with NO2. A good correlation between reactivity and electronic density was obtained for the two molecules studied : benzo(a)pyrene and dibenzo(a,h)pyrene
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Stéphane Delmas. Caractérisation organique et minérale des particules individuelles (aérosols) de l'environnement sidérurgique : étude des synergies entre la matière organique et la nature des espèces minérales en présence. Autre. Université Paul Verlaine - Metz, 1991. Français. ⟨NNT : 1991METZ020S⟩. ⟨tel-01775944⟩

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