Oxidation kinetics of plutonium(III) by nitrous acid in a tributyl phosphate solution

Journal Article · · Sov. Radiochem. (Engl. Transl.); (United States)

OSTI ID:6764839

Revyakin, V V; Marchenko, V I; Gitkovich, E S; Korableva, N A; Varykhanov, V P

The kinetics of the oxidation of plutonium(III) by nitrous acid in a medium of 30% TBP in n-dodecane was studied. It was found that in the concentration range of 5 x 10/sup -5/ to 1.3 x 10/sup -4/ mole/liter of Pu(III), (1.07-6.0) x 10/sup -3/ mole/liter of HNO/sub 2/, and 0.047-0.162 mole/liter of HNO/sub 3/, the rate of the reaction is given by the equation d(Pu(sup/IV/))/dt = k (Pu(sup/III/)) (HNO/sub 2/) (HNO/sub 3/)/sup 1.5/, where k = 1890 +/- 70 liter /sup 2.5//mole/sup 2.5 x min at a temperature of 3.0/sup 0/C. From the dependence of k on temperature (3.0-11.0/sup 0/C), the value of the activation energy, equal to 132.0kJ/mole, was determined. A mechanism has been proposed for the reactions corresponding to the experimental data, and including the reaction of Pu(sup/III/) with the N/sub 2/O/sub 4/ molecules and NO/sup +/ ions.

• OSTI ID: 6764839
• Journal Information: Sov. Radiochem. (Engl. Transl.); (United States), Journal Name: Sov. Radiochem. (Engl. Transl.); (United States) Vol. 25:3; ISSN SVRDA
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400702* -- Radiochemistry & Nuclear Chemistry-- Properties of Radioactive Materials
ACTINIDES
ACTIVATION ENERGY
ALKANES
BUTYL PHOSPHATES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DODECANE
ELEMENTS
ENERGY
ESTERS
HYDROCARBONS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
KINETICS
MEDIUM TEMPERATURE
METALS
NITROUS ACID
ORGANIC COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
OXIDATION
PHOSPHORIC ACID ESTERS
PLUTONIUM
REACTION KINETICS
TBP
TRANSURANIUM ELEMENTS