Skip to Main content Skip to Navigation
Theses

Impact de la composition minéralogique des sédiments sur la biodisponibilité de l’Uranium ˸ Une approche intégrant laboratoire-terrain-bioindicateur-calcul de spéciation

Abstract : The European Water Framework Directive introduced in 2000 has allowed to establish numerous quality environment standards for the last 18 years for compounds stemming from anthropic activity. However, the natural presence of uranium in the environment as well as itsreactivity complicates the construction of standards. The transfer of uranium betweensediment, water and the biological compartment is complex. Indeed, the passage of uranium through the cellular membrane can depend on the mineralogical composition as well as on the physico-chemical parameters. The objective of this study is to bring scientific foundationsaround these various parameters and hence to determine their impact on the accumulation.This way, the future definition of these new standards (NQE) takes into account the notion of bioavailability of contaminants. The strong impact of mineralogical phases such as ferrihydrite is both demonstrated in a post-mining context as well as within experiments in laboratory, as opposed to the quartz whose sorption capacity is low. A correlation is noted between the accumulation obtained by bioindicator “Chironomus riparius” and the one measured by a system of integrative passive sensors called DGT. This correlation is linked to the presence of potentially bioavailable species such as UO2OH2(aq), whose abundance is obtained by speciation calculations. These first conclusions give scientific foundations to feed the debate around the construction of the environment quality standards.
Document type :
Theses
Complete list of metadatas

https://pastel.archives-ouvertes.fr/tel-03091989
Contributor : Abes Star :  Contact
Submitted on : Friday, January 1, 2021 - 1:15:30 AM
Last modification on : Saturday, January 2, 2021 - 3:25:55 AM

File

2019PSLEM020_archivage.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-03091989, version 1

Citation

Angélique Husson. Impact de la composition minéralogique des sédiments sur la biodisponibilité de l’Uranium ˸ Une approche intégrant laboratoire-terrain-bioindicateur-calcul de spéciation. Ingénierie de l'environnement. Université Paris sciences et lettres, 2019. Français. ⟨NNT : 2019PSLEM020⟩. ⟨tel-03091989⟩

Share

Metrics

Record views

43

Files downloads

18