Spectroscopic study of Pu(IV) oxidation to Pu(VI) in 3 mol/dm3 nitric acid at 373 K
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Yasutoshi Ban
Abstract
Optical absorption spectra of Pu(IV) in 3 mol/dm3 (M) nitric acid at 373 K were measured using an optical quartz cell equipped with a thin-film heater. Pu(IV) was oxidized to Pu(VI) by heating at 373 K, and the concentrations of Pu(IV) and Pu(VI) gradually decreased and increased, respectively, with the heating time. The ratio of Pu(IV) oxidized to Pu(VI) was 37% at a heating time of 394 min, and no Pu(III) or Pu(V) characteristic peaks were observed throughout the experiment. The oxidation rate of Pu(IV) in 3 M nitric acid at 373 K could be described by the equation -d [Pu(IV)]t/d t= k′1 [Pu(IV)]t-k′2 [Pu(VI)]t, where [Pu(IV)]t and [Pu(VI)]t were the concentrations of Pu(IV) and Pu(VI) at a heating time of t min. The apparent rate constants for Pu(IV) oxidation (k′1) and Pu(VI) reduction (k′2) at 373 K were calculated to be 2.3 × 103 min-1 and 3.4 × 103 min-1, respectively.
© by Oldenbourg Wissenschaftsverlag, München, Germany
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Articles in the same Issue
- 41K(n, γ)42K thermal and resonance integral cross section measurements
- Spectroscopic study of Pu(IV) oxidation to Pu(VI) in 3 mol/dm3 nitric acid at 373 K
- Interfacial sorption/desorption studies of Pu(IV) on Silica and alumina surfaces
- The uranium recovery from aqueous solutions using amidoxime modified cellulose derivatives. I. Preparation, characterization and amidoxime conversion of radiation grafted ethyl cellulose-acrylonitrile copolymers
- Separation of oxidized americium from lanthanides by use of pillared metal(IV) phosphate-phosphonate hybrid materials
- Anomalous extraction behavior of americium(III) in some diglycolamide isomers present in ionic liquid medium
- Radiochemical studies relevant to cyclotron production of the therapeutic radionuclide 167Tm
- Radiation-induced nitration of organic compounds in aqueous solutions
- Titanate nanotubes: preparation, characterization and application in adsorption of strontium ion from aqueous solution
