Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
Studies on Actinoid Elements. V. The Determination of the Np(V)/Np(IV) Ratio in an Aqueous Solution by Means of the Partition Method
Akira OhyoshiTsuneo Kawamura
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1973 Volume 46 Issue 1 Pages 162-165


The distribution study of neptunium ions in an aqueous solution containing Np(IV) and Np(V) was made using the metal chelate extraction system, TTA-benzene, or HDEHP-benzene at room temperature. The results obtained by this method were then compared with those obtained by spectrophotometry. In each system, a linear relationship was obtained between the fraction of the Np(V) ion and 1/(D+1), where D is the distribution ratio of neptunium. This analysis was performed with an accuracy of ±5% and was established within one minute in the case of the HDEHP-benzene system. The results obtained by this method were in good agreement with those obtained by spectrophotometry.

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