Skip to Main content Skip to Navigation
Theses

Etude des mécanismes de fractionnement isotopique du bore lors de son interaction avec les acides humiques et les oxydes de fer et de manganèse.

Abstract : Boron complexation with organic ligands, floculated humic acids, iron oxyhydroxydes (goethite) and manganese oxides (birnessite) has been characterized using potentiometry, adsorption measurements, DRIFT and 11B NMR spectroscopy. Resulting B isotopic fractionation was measured (TIMS). This work shows that boron is strongly complexed by both organic compounds and metal oxides, with, generally, a preferential enrichment of its light isotope (10B) and heavy isotope (11B) at solid surface and in solution, respectively. Adsorption and isotopic fractionation data were successfully modelled, indicating a strong steric control on the isotopic composition of boron surface complexes. This study shows that boron-soil interactions during weathering are likely to have a strong impact on the isotopic composition of surface waters and oceans.
Complete list of metadatas

https://tel.archives-ouvertes.fr/tel-00011610
Contributor : Williams Exbrayat <>
Submitted on : Thursday, February 23, 2006 - 3:41:27 PM
Last modification on : Monday, October 19, 2020 - 10:54:12 AM
Long-term archiving on: : Saturday, April 3, 2010 - 10:23:51 PM

Identifiers

  • HAL Id : tel-00011610, version 1

Collections

Citation

Emmanuel Lemarchand. Etude des mécanismes de fractionnement isotopique du bore lors de son interaction avec les acides humiques et les oxydes de fer et de manganèse.. Géologie appliquée. Université Paul Sabatier - Toulouse III, 2005. Français. ⟨tel-00011610⟩

Share

Metrics

Record views

903

Files downloads

2851