Influence de la compétition des anions (hydroxydes, carbonates) sur la complexation des lanthanides trivalents par la matière organique naturelle : cas des substances humiques

Abstract : The aim of this study is to acquire and refine complexation data for understanding the fate of lanthanides in the environment where the concentrations of organic matter are highly variable. This study is focusing on both the description and understanding of the interactions between the europium(III) and a Suwannee River fulvic acid (SRFA) as a representative of humic substances (HS), and the influence of major anions present in natural waters, i.e. hydroxides and carbonates ions, in these interactions. To understand the ternary systems Eu-OH-SRFA and Eu-CO3-SRFA, Eu-SRFA and Eu-CO3 binary systems are first investigated by time-resolved luminescence spectroscopy (TRLS) for wide ranges of pH, ionic strength, Eu(III), SRFA and CO3 concentrations. This study shows that the structures of humic substances are influenced by the presence of Eu(III). Interaction constants are determined for the Eu-SRFA binary system and are used for the understanding of the Eu-CO3-SRFA ternary system. Eu-CO3-SRFA ternary complexes are highlighted by SLRT, and an interaction constant has also been proposed in the frame of the NICA-Donnan model. Variations in size of Eu-SRFA complexes as a function of europium and SRFA concentrations are presented, and the impact of these variations on NICA-Donnan parameters is investigated. The results of this work are challenging modeling concepts of metal-HS interactions at various HS concentrations, in particular for the consideration of electrostatic effects.
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Yasmine Kouhail. Influence de la compétition des anions (hydroxydes, carbonates) sur la complexation des lanthanides trivalents par la matière organique naturelle : cas des substances humiques. Chimie inorganique. Institut de physique du globe de paris - IPGP, 2016. Français. ⟨tel-01398507⟩

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