Oxidation of U(VI) with oxygen in weakly acidic and neutral solutions

被引：2

作者：

Shilov V.P. ^{[1
]}

Yusov A.B. ^{[1
]}

Fedoseev A.M. ^{[1
]}

Peretrukhin V.F. ^{[1
]}

Gogolev A.V. ^{[1
]}

Delegard C.H. ^{[2
]}

机构：

[1] Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow

[2] Pacific Northwest National Laboratory, Richland, WA

来源：

Radiochemistry | 2007年 / 49卷 / 5期

关键词：

82.20.Pm;

D O I：

10.1134/S1066362207050049

中图分类号：

学科分类号：

摘要：

The kinetics of U(IV) oxidation with atmospheric oxygen in solutions with pH 2-7 was studied. In the kinetic curves there is an induction period, which becomes shorter with increasing pH. The induction period is caused by accumulation of U(VI), whose initial presence in the working solution accelerates oxidation. The pseudo-first-order rate constants and bimolecular rate constants of U(IV) oxidation with oxygen were evaluated. The mechanism of U(IV) oxidation is considered. At pH higher than 3, formation of a polymer of hydrolyzed U(IV) with U(VI) plays an important role in oxidation of U(IV), since this prevents formation of U(V). Heating accelerates oxidation of U(IV) at pH 2-2.5, but at a higher pH the process becomes difficultly controllable. © 2007 Pleiades Publishing, Inc.

引用

页码：470 / 475

页数：5

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