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- Author or Editor: M. Kadri x
- Chemistry and Chemical Engineering x
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Abstract
Addition of solutions of mycobactin S in acetone or methanol/acetone mixtures to solutions of NpO
2
2+
in the same solvent leads to the immediate reduction of neptunium/VI/ to neptunium/V/. Np/V/ interacts with the ionophore to form a yellow complex with a cation: ligand ratio of 2
1. The course of these reactions is followed by measurement of changes in characteristic optical absorption and by spectrophotometric titration within the range 700–1350 nm.
Abstract
Various simple and complex compounds of238U and237Np have been irradiated in a neutron flux. The chemical state of239U and238Np formed in (n, 
) reactions has been determined as a function of the initial oxidation state of the actinide elements and of the nature of ligands. A scheme for the chemical reactions following neutron capture is proposed.
Abstract
The chemical state of239Np formed in the 
-decay of239U produced by thermal neutron capture in239U, has been determined in simple uranium compounds as well as in macrocyclic complexes of this element. It is shown that the behavior of neptunium depends on such factors as the nature of the target, the counter-ion of the complex, the dissolution medium and the pH. The change of the oxidation state of239Np with time and the effect of the presence of macroscopic amounts of238UO
2
2+
and of238U(IV) in the solution have also been investigated. The results are discussed in terms of the hot atom behavior of239U and of the genuine effects of -decay.
