Radiation-chemical reduction of plutonium(VI) in nitric acid solutions. Influence of palladium(II) and uranium(VI) ions

Journal Article · Fri Nov 01 04:00:00 EST 1985 · Sov. Radiochem. (Engl. Transl.); (United States)

OSTI ID:5952448

Tkhorzhnitshii, G P; Egorov, G F

The influence of uranium(VI) and palladium(II) on the radiation-chemical reduction of plutonium(VI) in 4 M nitric acid was investigated. A quadratic dependence of the maximum yield of the reduction of Pu(VI) on the total plutonium concentration in the range 0.008-0.1 M was detected in the presence of uranyl nitrate, explained by competition of the reaction of Pu(III) and Pu(V), determining the rate of the process, with their oxidation by OH and NO/sub 3/ radicals and by nitrous acid. The rate constant of the interaction of oxidizing radicals with pentavlent plutonium was estimated according to the experimental data using a mathematical model. The accelerating action of palladium(II) on the radiolytic reduction of hexavalent plutonium is explained by its rapid interaction with OH and NO/sub 3/ radicals. Hexavalent uranium accelerates the determining step, and also serves as a source of formation of an effective reducing agent-pentavalent uranium.

• OSTI ID: 5952448
• Journal Information: Sov. Radiochem. (Engl. Transl.); (United States), Journal Name: Sov. Radiochem. (Engl. Transl.); (United States) Vol. 27:2; ISSN SVRDA
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400700 -- Radiochemistry & Nuclear Chemistry
400700* -- Radiochemistry & Nuclear Chemistry
ACTINIDE COMPOUNDS
ACTINIDES
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISTRY
DECOMPOSITION
ELEMENTS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
KINETICS
MATHEMATICAL MODELS
METALS
NITRATES
NITRIC ACID
NITROGEN COMPOUNDS
OXIDATION
OXYGEN COMPOUNDS
PALLADIUM COMPOUNDS
PLUTONIUM
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIOCHEMISTRY
RADIOLYSIS
REACTION KINETICS
REDOX POTENTIAL
REDUCING AGENTS
REDUCTION
TRANSITION ELEMENT COMPOUNDS
TRANSURANIUM ELEMENTS
URANIUM COMPOUNDS
URANYL COMPOUNDS
URANYL NITRATES
VALENCE