Kinetic Studies on the Oxidation of Uranium(Ⅳ)in Nitric Acid Medium

Abstract

Abstract: The kinetics of oxidation of uranium(Ⅳ)in nitric acid medium by nitrite and air oxygen, respectively, has been investigated. The effects of concentration of uranium(Ⅳ), nitrate, hydrogen ion and nitrite in the aqueous solution or the oxygen in air on tl1e oxidation rate of uranium(Ⅳ)were examined.The oxidation rate of uranium(Ⅳ)increases obviously with increasing temperature and the apparent activation energies were 47 kJ/mol for nitrite and 91 kJ/mol for oxygen as the oxidant.The mechanisms of oxidation of uraniuni(Ⅳ)for both oxidation reaction were discussed.

Key words: Tetravalent uranium, Nitric acid medium, Oxidation, Kinetics

TrendMD:

AHOU Zu-Ming, ZHANG Ying-Jie, DU Hui-Fang. Kinetic Studies on the Oxidation of Uranium(Ⅳ)in Nitric Acid Medium[J]. Chem. J. Chinese Universities, 1994, 15(9): 1393.

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Kinetic Studies on the Oxidation of Uranium(Ⅳ)in Nitric Acid Medium

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