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Étude par spectroscopies moléculaires de la complexation de l'aluminium (III) par l'acide caféique : compétition avec les substances humiques

Abstract : Humic substances are macromolecules presenting several sites able to complex metallic ions. Small organic molecules of low molar weight are associated to them. Although they are in the minority, they are more mobile in the soils and constitute an important vector in the transport of metals. The UV visible and fluorescence spectroscopies have allowed the determination of the composition and the stability of the complexes formed between caffeic acid and Al(III) in aqueous medium at pH 5 and 6,5. It is noted that an increase of pH leads to species of high stoichiometry. The complexation of AI(III) by humic acid and the competition between this macromolecule and caffeic acid were also studied. The quenching of fluorescence observed upon complexation of metal on humic acid, has allowed the calculation of the Stem Volmer constant. An interaction between the two acids, and a division of Al(III) to reach a quasi equilibrium state was observed.
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Alexandra Caudron. Étude par spectroscopies moléculaires de la complexation de l'aluminium (III) par l'acide caféique : compétition avec les substances humiques. Chimie. Université des Sciences et Technologie de Lille - Lille I, 2004. Français. ⟨tel-00283230⟩

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