Email this article Disproportionation of Plutonium(V) in EDTA Solutions
- Authors: Fedoseev A.M.1, Shilov V.P.1
-
Affiliations:
- Frumkin Institute of Physical Chemistry and Electrochemistry
- Issue: Vol 66, No 3 (2024)
- Pages: 241-245
- Section: Articles
- URL: https://ruspoj.com/0033-8311/article/view/681635
- DOI: https://doi.org/10.31857/S0033831124030046
- ID: 681635
Cite item
Open Access
Access granted
Abstract
The kinetics of disproportionation of Pu(V) in EDTA solutions with pH 2.5–4.8 at a temperature of 45°C was studied using the spectrophotometric method. Pu(V) was obtained by reduction of Pu(VI) with EDTA ions. The rate of disproportionation in the pH range 2.9–4.8 is described by the equation –d[Pu(V)]/dt = 2k[Pu(V)]2. As pH increases, the value of 2k decreases. In a solution of 28 mmol/L EDTA at pH 2.91, 45 °C, and an ionic strength of 0.09 and 1.0 mol/L, 2k is 0.064 and 0.040 L mol–1 s–1, respectively. A dimer is formed from PuО2+ ·5H2O and the PuO2HY2–nH2O complex, which becomes an activated complex. Its decomposition leads to the appearance of Pu(IV) and Pu(VI). The latter, being bound to Y, is reduced intramolecularly to Pu(V). The activation energy is estimated at 86 kJ/mol (25–45°C).
Keywords
Full Text
About the authors
A. M. Fedoseev
Frumkin Institute of Physical Chemistry and Electrochemistry
Author for correspondence.
Email: A.Fedosseev@gmail.com
Russian Federation, Leninskii pr. 31, korp. 4, Moscow, 119071
V. P. Shilov
Frumkin Institute of Physical Chemistry and Electrochemistry
Email: shilov.ipce@gmail.com
Russian Federation, Leninskii pr. 31, korp. 4, Moscow, 119071
References
- Бессонов А.А., Шилов В.П. // Радиохимия. 2023. Т. 65. № 1. С. 3–16.
- Clark D.L., Hecker S.S., Jarvinen G.D., Neu M.P. // Plutonium. In: The Chemistry of the Actinide and Transactinide Elements. Eds L.R. Morss, M.N. Edelstein, J. Fuger, J.J. Katz. Dordrecht: Springer, 2006. Vol. 2. Ch. 7. P. 813–1264.
- Eberle S.H., Wede U. // J. Inorg. Nucl. Chem. 1970. Vol. 32. No. 1. P. 109–117.
- Шилов В.П., Степанова Е.С., Крот Н.Н. // Радиохимия. 1979. Т. 21. № 4. С. 602–607.
- Шилов В.П., Федосеев А.М. // Радиохимия. 2015. Т. 57. № 4. С. 348–351.
- DiBlasi N.A., Yalsintas E., Stanley F.E., Reed D.T., Hixon A.E. // Chemosphere. 2021. Vol. 274. Article 129741.
Supplementary files
