Chemical speciation of heterogeneously reduced Pu in synthetic brines
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Mei Ding
Summary
X-ray absorption fine structure (XAFS) spectroscopy has been used to determine the speciation of Pu precipitates prepared by the heterogeneous reduction of Pu(VI) with Al and Fe in 5 M NaCl and an ERDA-6 brine, a simulant from the Waste Isolation Pilot Plant in Carlsbad, New Mexico. NaOCl was added to some of these solutions to determine its effect on Pu speciation. Analysis of the Pu LIII spectra showed that all solids consisted of PuO2+x-y(OH)2y·z H2O, compounds with characteristics identical to those prepared by hydrolysis and with Pu-O and Pu-Pu distances identical to those treated at elevated temperature. Additionally, reduction with Al gave compounds with different site distributions than reduction with Fe, and reduction with Al or the addition of NaOCl appeared to suppress the formation of oxo groups and their associated Pu(V) sites.
© by Oldenbourg Wissenschaftsverlag, München
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Artikel in diesem Heft
- 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
