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Habilitation à diriger des recherches

Structure-reactivity relationships in the interactions between humic substances, pollutants from the nuclear cycle, and mineral surfaces

Pascal E. Reiller 1 
1 LANIE - Laboratoire de développement Analytique Nucléaire Isotopique et Elémentaire
SEARS - Service d'études analytiques et de réactivité des surfaces : DEN/DPC
Abstract : This document proposes an analysis of the structure-reactivity relationships in the interaction between humic substances, metallic pollutants from the nuclear cycle, and mineral surfaces. It composes the scientific document, which allowed the author to defend a habilitation degree. It is mainly focused on the research works into which the author have been involved in on this particular thematic. Humic substances are issued from the degradation of the living. They have an important influence onto migration of metals in the environment. They are showing particular intrinsic physic and chemical, metal complexation, and adsorption onto mineral surfaces properties, which render the global comprehension of the different mechanisms somehow difficult. These three aspects are covered in this document. The first part is dedicated to the studies on composition, structure, and organization of humic substances, which cannot be considered as a well-defined type of chemical. They are a heterogeneous degradation product with a supramolecular organization, which is showing fractal properties from fractions up to several nanometers. Second part is on the complexation reactions. The different modelling strategies come from the difficulties on apprehending composition, structure, and organization of humic substances. The different models used are showing more or less strongly empiric characteristics. They can be derived from the mass action law, or explicitly account for heterogeneity, acido-basic, or ionic strength related parameters. The third and latter part covers the adsorption studies. The main property is adsorptive fractionation, which induces modification of chemical composition of humic substances between the surface and the solution. It also induces modification of complexation properties between the adsorbed and non-adsorbed fractions. Because of adsorptive fractionation, and the particular influence of ionic strength on humic substances, and of complexed metals, adsorption, the studies on simple model molecules to represent humic substances reactivity are an illusion. The global comprehension will mainly be obtained from the understanding of dedicated studies.
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https://tel.archives-ouvertes.fr/tel-01193077
Contributor : Pascal Reiller Connect in order to contact the contributor
Submitted on : Monday, September 7, 2015 - 10:28:24 AM
Last modification on : Monday, December 13, 2021 - 9:14:36 AM
Long-term archiving on: : Tuesday, December 8, 2015 - 10:33:49 AM

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Distributed under a Creative Commons Attribution - NoDerivatives 4.0 International License

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  • HAL Id : tel-01193077, version 1

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Pascal E. Reiller. Structure-reactivity relationships in the interactions between humic substances, pollutants from the nuclear cycle, and mineral surfaces. Geochemistry. Université Denis Diderot, 2015. ⟨tel-01193077⟩

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