Transfert des hydrocarbures aromatiques polycycliques à l'échelle d'un bassin versant : caractérisation de sources par l'isotopie moléculaire

Abstract : Polyaromatic hydrocarbons (PAHs) are a group of toxic and carcinogenic organic compounds formed by petrogenic and incomplete pyrolytic processes. Although emission reductions were observed over the past 20 years, PAH contamination is still an environmental concern as these compounds are the main contaminants in the Seine watershed. Many tools were developed to identify their origins and fate. However, these methods do not always allow accurate identification of emission sources. A method integrating the variations of the isotopic ratios of δ13C and δ2H among 16 compounds was developed and compared to those of the molecular diagnostic ratio techniques. The development of the protocol consisted of the preparation and the validation of a selective extraction method by matrix type (water / sediment) and a purification step to obtain for each molecule, a resolution adapted to its isotopic analysis. That method applied to various combustion products in the Ile-de-France region, such as samples of atmospheric deposition, water and river sediments. The measurement of δ13C and δ2H signatures confirmed the presence of local sources and helped to characterize the seasonal variations of the ratios. The originality of this research work is the use of δ2H on individual PAH instead of bulk compounds. The results allow considering new perspectives for the use of isotopic measurements.
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Raphaël Fauches. Transfert des hydrocarbures aromatiques polycycliques à l'échelle d'un bassin versant : caractérisation de sources par l'isotopie moléculaire. Sciences de la Terre. PSL Research University, 2017. Français. ⟨NNT : 2017PSLEP014⟩. ⟨tel-02105275⟩

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