Oxidation State of Neptunium and Plutonium and Their Leaching from Sodium–Aluminum–(Iron) Phosphate Glasses


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Resumo

The oxidation states of neptunium and plutonium in doped sodium–aluminum–(iron) phosphate glasses have been determined by X-ray photoelectron spectroscopy. Neptunium is present in the form of Np(IV) as Np4+ and, in smaller amounts, in the form of Np(V) as neptunyl ions. Plutonium is present mainly in the form of Pu(IV) and additionally Pu(III). The most easily water-leachable element is neptunium, which is attributed to its existence in the mobile form of neptunyl (NpO2)+. The leaching rates of plutonium and impurity americium are approximately two orders of magnitude lower.

Sobre autores

S. Stefanovsky

Frumkin Institute of Physical Chemistry and Electrochemistry; Radon Federal State Unitary Enterprise

Autor responsável pela correspondência
Email: serge.stefanovsky@yandex.ru
Rússia, Moscow, 119071; Moscow, 119121

K. Maslakov

Moscow State University

Email: serge.stefanovsky@yandex.ru
Rússia, Moscow, 119991

Yu. Teterin

Moscow State University; National Research Center Kurchatov Institute

Email: serge.stefanovsky@yandex.ru
Rússia, Moscow, 119991; Moscow, 123182

S. Kalmykov

Moscow State University

Email: serge.stefanovsky@yandex.ru
Rússia, Moscow, 119991

S. Danilov

Vernadsky Institute of Geochemistry and Analytical Chemistry

Email: serge.stefanovsky@yandex.ru
Rússia, Moscow, 119991

A. Teterin

National Research Center Kurchatov Institute

Email: serge.stefanovsky@yandex.ru
Rússia, Moscow, 123182

K. Ivanov

National Research Center Kurchatov Institute

Email: serge.stefanovsky@yandex.ru
Rússia, Moscow, 123182

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