A Critical Evaluation of the Redox Properties of Uranium, Neptunium and Plutonium Ions in Acidic Aqueous Solutions
Standard redox potentials, s, and redox processes of U, Np and Pu ions in acidic aqueous solutions are reviewed and evaluated critically. The of reversible redox processes, MO /MO and M /M (M: U, Np or Pu) adopted are those proposed mainly by Riglet et al. on the basis of the precise correction of f...
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| Published in | Pure and applied chemistry Vol. 71; no. 9; pp. 1771 - 1807 |
|---|---|
| Main Authors | , , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
Berlin
De Gruyter
01.09.1999
Walter de Gruyter GmbH |
| Subjects | |
| Online Access | Get full text |
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| Abstract | Standard redox potentials,
s, and redox processes of U, Np and Pu ions in acidic aqueous solutions are reviewed and evaluated critically. The
of reversible redox processes, MO
/MO
and M
/M
(M: U, Np or Pu) adopted are those proposed mainly by Riglet et al. on the basis of the precise correction of formal potentials,
s, according to the improved theoretical approach to estimate the activity coefficient. Electrode processes of the U, Np and Pu ions are discussed in terms of current-potential curves, measured so far by polarography, voltammetry or flow coulometry. Special attention is payed to the irreversible MO
/M
reactions. Disproportionation reactions of MO
are also discussed. New substances are introduced as intermediates during reductions of MO
to M
or disproportionations of MO |
|---|---|
| AbstractList | Abstract
Standard redox potentials,
E
0
s, and redox processes of U, Np and Pu ions in acidic aqueous solutions are reviewed and evaluated critically. The
E
0
s
of reversible redox processes, MO
2
2+
/MO
2
+
and M
4+
/M
3+
(M: U, Np or Pu) adopted are those proposed mainly by Riglet et al. on the basis of the precise correction of formal potentials,
E
0'
s, according to the improved theoretical approach to estimate the activity coefficient. Electrode processes of the U, Np and Pu ions are discussed in terms of current-potential curves, measured so far by polarography, voltammetry or flow coulometry. Special attention is payed to the irreversible MO
2
+
/M
4+
reactions. Disproportionation reactions of MO
2
+
are also discussed. New substances are introduced as intermediates during reductions of MO
2
+
to M
4+
or disproportionations of MO
2
+
.
CONTENTS
Introduction
Standard redox potentials for uranium, neptunium and plutonium ions in acidic aqueous solutions
2.1 Evaluation of
E
0
from
E
0'
determined by electrochemical measurements
2.2 Temperature dependence of
E
0
Redox reactions of uranium, neptunium and plutonium in acidic aqueous solutions investigated by polarography or voltammetry
3.1 Uranium
3.2 Neptunium
3.3 Plutonium
3.4 Disproportionation of NpO
2
+
, PuO
2
+
, Np
4+
and Pu
4+
3.5 Reduction of MO
2
+
and reduction intermediates
Redox reactions of uranium, neptunium and plutonium in acidic aqueous solutions investigated by flow coulometry
4.1 Electrode processes of the uranium, neptunium and plutonium ions investigated by flow coulometry at the column electrode at the column electrode
4.2 Disproportionation of MO
2
+
during the electrolysis by flow coulometry
4.3 Reduction mechanisms of MO
2
+
(M = Np or Pu) and reduction intermediates investigated by flow coulometry
Conclusions
List of abbreviations
Appendix
References Standard redox potentials, E0s, and redox processes of U, Np and Pu ions in acidic aqueous solutions are reviewed and evaluated critically. The E0sof reversible redox processes, MO22+/MO2+ and M4+/M3+ (M: U, Np or Pu) adopted are those proposed mainly by Riglet et al. on the basis of the precise correction of formal potentials, E0's, according to the improved theoretical approach to estimate the activity coefficient. Electrode processes of the U, Np and Pu ions are discussed in terms of current-potential curves, measured so far by polarography, voltammetry or flow coulometry. Special attention is payed to the irreversible MO2+/M4+ reactions. Disproportionation reactions of MO2+ are also discussed. New substances are introduced as intermediates during reductions of MO2+ to M4+ or disproportionations of MO2+.CONTENTSIntroductionStandard redox potentials for uranium, neptunium and plutonium ions in acidic aqueous solutions2.1 Evaluation of E0 from E0' determined by electrochemical measurements2.2 Temperature dependence of E0Redox reactions of uranium, neptunium and plutonium in acidic aqueous solutions investigated by polarography or voltammetry3.1 Uranium3.2 Neptunium3.3 Plutonium3.4 Disproportionation of NpO2+, PuO2+, Np4+ and Pu4+3.5 Reduction of MO2+ and reduction intermediatesRedox reactions of uranium, neptunium and plutonium in acidic aqueous solutions investigated by flow coulometry4.1 Electrode processes of the uranium, neptunium and plutonium ions investigated by flow coulometry at the column electrode at the column electrode4.2 Disproportionation of MO2+ during the electrolysis by flow coulometry4.3 Reduction mechanisms of MO2+ (M = Np or Pu) and reduction intermediates investigated by flow coulometryConclusionsList of abbreviationsAppendixReferences Standard redox potentials, s, and redox processes of U, Np and Pu ions in acidic aqueous solutions are reviewed and evaluated critically. The of reversible redox processes, MO /MO and M /M (M: U, Np or Pu) adopted are those proposed mainly by Riglet et al. on the basis of the precise correction of formal potentials, s, according to the improved theoretical approach to estimate the activity coefficient. Electrode processes of the U, Np and Pu ions are discussed in terms of current-potential curves, measured so far by polarography, voltammetry or flow coulometry. Special attention is payed to the irreversible MO /M reactions. Disproportionation reactions of MO are also discussed. New substances are introduced as intermediates during reductions of MO to M or disproportionations of MO |
| Author | Kitatsuji, Yoshihiro Aoyagi, Hisao Yoshida, Zenko Shirai, Osamu Kihara, Sorin Yoshida, Yumi Maeda, Kohji |
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| Snippet | Standard redox potentials,
s, and redox processes of U, Np and Pu ions in acidic aqueous solutions are reviewed and evaluated critically. The
of reversible... Abstract Standard redox potentials, E 0 s, and redox processes of U, Np and Pu ions in acidic aqueous solutions are reviewed and evaluated critically. The E 0... Standard redox potentials, E0s, and redox processes of U, Np and Pu ions in acidic aqueous solutions are reviewed and evaluated critically. The E0sof... |
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| SubjectTerms | Abbreviations Activity coefficients Aquatic plants Aqueous solutions Chemical reactions Coulometers Coulometry Disproportionation Electrodes Electrolysis Neptunium Plutonium Plutonium dioxide Polarography Redox reactions Reduction Temperature dependence Voltammetry |
| Title | A Critical Evaluation of the Redox Properties of Uranium, Neptunium and Plutonium Ions in Acidic Aqueous Solutions |
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