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Investigation of the influence of alpha-irradiation on the valence states of actinoids. X. Oxidation of plutonium(III) in nitric acid solutions

Journal Article · · Sov. Radiochem. (Engl. Transl.); (United States)
OSTI ID:7002593
; ; ;
A spectrophotometric method is used to study the dependence of the radiochemical oxidation of plutonium(III) in nitric acid solutions on the nitric acid concentration (0.12-2.9 mole/liter) and on the initial plutonium concentration (1.4-10 mole/liter). Intense internal alpha-radiation with a dose strength of 3.2 Gy/sec was effected by the introduction of curium-244 into the solution. It was established that in weakly acidic solutions the oxidation of plutonium(III) proceeds only partially and is accompanied by the formation of plutonium(IV) peroxide complex. Increasing the concentration of nitric acid leads to a growth in the rate and completeness of plutonium(III) oxidation. For C/sub HNO/sub 3// > 0.5 mole/liter formation of the peroxide complex is not observed, and the oxidation process exhibits an autocatalytic character. It is shown that nitrous acid exerts a substantial influence on the kinetics of plutonium(III) oxidation. Mathematical modeling calculations based on a proposed kinetic scheme have been carried out with the help of a BESM-6 computer, and satisfactory agreement is seen between the calculated and experimental kinetic curves.
OSTI ID:
7002593
Journal Information:
Sov. Radiochem. (Engl. Transl.); (United States), Journal Name: Sov. Radiochem. (Engl. Transl.); (United States) Vol. 29:3; ISSN SVRDA
Country of Publication:
United States
Language:
English

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Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
ACTINIDE COMPLEXES
ACTINIDE COMPOUNDS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
ALPHA PARTICLES
CHARGED PARTICLES
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISTRY
COMPLEXES
COMPLEXOMETRY
COMPUTERIZED SIMULATION
CURIUM 244
CURIUM ISOTOPES
EVEN-EVEN NUCLEI
HEAVY NUCLEI
HYDROGEN COMPOUNDS
INORGANIC ACIDS
IRRADIATION
ISOTOPES
KINETICS
MATHEMATICAL MODELS
NITRIC ACID
NITROUS ACID
NUCLEI
OXIDATION
OXYGEN COMPOUNDS
PEROXIDES
PLUTONIUM COMPLEXES
PLUTONIUM COMPOUNDS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIOISOTOPES
REACTION KINETICS
SIMULATION
SPECTROPHOTOMETRY
TRANSURANIUM COMPLEXES
TRANSURANIUM COMPOUNDS
VALENCE
YEARS LIVING RADIOISOTOPES