Modélisation et évaluation des équilibres de complexation entre la matière organique naturelle, les métaux traces et le proton. Applications aux eaux naturelles

Abstract : The aim of this study is the modelling of NOM acidity and complexing properties by an accurate determination of its interactions and by exemption from the exact structure of its organic components. NOM has been defined by a chemical modelling composed of quasi-particles mimicking non-specific and specific NOM interactions towards cations and metal respectively. PROSECE software, developed in this study, allows the calculation of the speciation and the optimisation of most of the complexation parameters from experimental data. Compared to other data treatments, PROCESE proved itself the most suitable one, especially when it is linked to a non-linear addition technique: the logarithmic titration mode. NOM-trace metal interactions have been analysed by DPASV on the largest analytic scale and the automation of the logarithmic titrations has specially been developed. NOM-proton interactions have been analysed by acido-basic titration. Interactions between a standard NOM, Suwannee River fulvic acid, cadmium, lead and proton have simultaneously been carried out. Acidic properties of the Seine river (France) samples have been studied during a year and linked to various biogeochemical factors. A 0.04 meq acidic sites concentration has been defined as the lowest value for a correct optimisation of NOM acidic properties. PROSECE has been used to the modelling of fluorescence quenching experiments to precise their analysis. Marine NOM properties analysis has been initiated. Due to the environment intricacy, those complexing properties characterisation is more complex and analytical adaptations are needed.
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Cédric Garnier. Modélisation et évaluation des équilibres de complexation entre la matière organique naturelle, les métaux traces et le proton. Applications aux eaux naturelles. Autre. Université du Sud Toulon Var, 2004. Français. ⟨tel-00009140⟩

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