Speciation of technetium and rhenium complexes by in situ XAS-electrochemistry
-
Frédéric Poineau
Summary
A spectro-electrochemical cell was developed in order to study the speciation of radio-elements in thermodynamic unstable redox states using in situ XAS spectroscopy. This cell was used for the speciation of Re and Tc complexes in chloride media. Experiments on Re were carried out with the aim to validate the functionality of the experimental set-up. During electro-reduction of Re(VII) in HCl media, EXAFS and XANES studies were performed in order to reveal the formation of chloro-oxygenated compounds of Re(IV). The speciation of technetium in aqueous solutions of deep geological deposits for radioactive waste is important to predict its mobility under reducing conditions. XANES spectra showed that electro-reduction of Tc(VII) in chloride media leads to a position of K-edge absorption which agrees with a Tc(IV)/Tc(III) mixture.
© by Oldenbourg Wissenschaftsverlag, München
Articles in the same Issue
- Investigations on the thermal release of iodine from liquid eutectic lead-bismuth alloy
- Sorption of Cm(III) onto different Feldspar surfaces: a TRLFS study
- Chemical speciation of heterogeneously reduced Pu in synthetic brines
- Separation of trivalent actinides from lanthanides in an acetate buffer solution using Cyanex 301
- N, N′-dimethyl-N, N′-dibutyl tetradecyl malonamide impregnated magnetic particles for the extraction and separation of radionuclides from nuclear waste streams
- Experimental evidence for the influence of the excitation wavelength on the value of the equilibrium constant as determined by Time-Resolved Emission Spectroscopy (TRES)
- Speciation of technetium and rhenium complexes by in situ XAS-electrochemistry
- Condensation mechanisms of tetravalent technetium in chloride media
- Erratum to the article “Sunflower stem: a novel and economical scavenger for Hg(II) ions from aqueous solutions and its kinetic and thermodynamic investigation” by Ummat Rasul Malik, Syed Moosa Hasany, Muhammad Sadiq Subhani
Articles in the same Issue
- Investigations on the thermal release of iodine from liquid eutectic lead-bismuth alloy
- Sorption of Cm(III) onto different Feldspar surfaces: a TRLFS study
- Chemical speciation of heterogeneously reduced Pu in synthetic brines
- Separation of trivalent actinides from lanthanides in an acetate buffer solution using Cyanex 301
- N, N′-dimethyl-N, N′-dibutyl tetradecyl malonamide impregnated magnetic particles for the extraction and separation of radionuclides from nuclear waste streams
- Experimental evidence for the influence of the excitation wavelength on the value of the equilibrium constant as determined by Time-Resolved Emission Spectroscopy (TRES)
- Speciation of technetium and rhenium complexes by in situ XAS-electrochemistry
- Condensation mechanisms of tetravalent technetium in chloride media
- Erratum to the article “Sunflower stem: a novel and economical scavenger for Hg(II) ions from aqueous solutions and its kinetic and thermodynamic investigation” by Ummat Rasul Malik, Syed Moosa Hasany, Muhammad Sadiq Subhani
