Investigation of the oxidation of cerium by ozone in nitric acid solutions. [Ce(III). -->. Ce(IV)]

Journal Article · Wed Jan 01 04:00:00 EST 1975 · Sov. Radiochem. (Engl. Transl.); (United States)

OSTI ID:7361598

Chepovoi, V I; Lebedev, I A; Myasoedov, B F

The oxidation of Ce(III) to Ce(IV) by ozone was investigated in 8.9 M HNO/sub 3/ in the interval of Ce concentrations from 5 x 10/sup -2/ to 1 x 10/sup -5/ M. It was shown that at room temperature complete and stable oxidation occurs only at concentrations of Ce greater than or equal to 5 x 10/sup -2/ M; at concentrations of Ce less than 1 x 10/sup -5/ M practically no oxidation is observed. When solutions of ozonized Ce are allowed to stand, a reduction of Ce(IV) occurs. The rate of reduction corresponds to a first-order reaction relative to Ce(IV). The value of the apparent rate constant of the reaction increases monotonically with decreasing Ce concentration. At a constant concentration of Ce, the value of the constant is higher, the lower the concentration of nitric acid and the higher the concentration of residual ozone and its decomposition products. In the light the reduction of Ce(IV) occurs substantially more rapidly than in darkness.

• OSTI ID: 7361598
• Journal Information: Sov. Radiochem. (Engl. Transl.); (United States), Journal Name: Sov. Radiochem. (Engl. Transl.); (United States) Vol. 17:2; ISSN SVRDA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
AQUEOUS SOLUTIONS
CERIUM COMPOUNDS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DISPERSIONS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
KINETICS
MIXTURES
NITRIC ACID
OXIDATION
OZONE
RARE EARTH COMPOUNDS
REACTION KINETICS
REDUCTION
SOLUTIONS