Determination of the rate constant for the reaction of americium ions with atomic hydrogen in aqueous solutions by means of pulse radiolysis

Journal Article · Sun Mar 01 04:00:00 EST 1992 · High Energy Chemistry

OSTI ID:224082

Gogolev, A V; Shilov, V P; Fedoseev, A M ^[1]

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1. and others

For the rate constant for several series of reactions involving actinides (An) a dependence of the reaction rate constant on the difference in the oxidation-reduction potentials of the reactants {Delta}E{sup 0} is revealed, owing to the similarity of the structural and electronic properties of these elements in identical oxidation states. It was found that for the reactions of UO{sub 2}{sup 2+}, NpO{sub 2}{sup 2}, and PuO{sub 2}{sup 2+} with atomic hydrogen, the logarithm of the reaction rate constant is a linear function of {Delta}E{sup 0} for the AnO{sub 2} {sup 2+}/AnO{sub 2}{sup +} pair. Extrapolation of the function to the {Delta}E{sup 0} for the AmO{sub 2}{sup 2+}/Am{sub 0}{sup +} pair indicates that the reaction H+AmO{sub 2}{sup 2+}{r_arrow}H{sup +}+AmO{sub 2}{sup +} should have a rate constant {approximately}1{center_dot}10{sup 9} liter/mole{center_dot}sec. In order to verify this, the authors measured k{sup 1} using pulsed radiolysis and spectrophotometric detection of the short-lived species. For sake of comparison, the rate constant for the reaction H+AmO{sub 2}{sup +}{r_arrow}H{sup +}+Am(H{sub 2}O){sub n}{sup 4+} was also measured. 8 refs., 1 fig.

• OSTI ID: 224082
• Journal Information: High Energy Chemistry, Journal Name: High Energy Chemistry Journal Issue: 5 Vol. 25; ISSN 0018-1439; ISSN HIECAP
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
AMERICIUM OXIDES
AQUEOUS SOLUTIONS
CATIONS
CHEMICAL REACTION KINETICS
HYDROGEN
RADIOLYSIS
VALENCE