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Spectrophotometric Investigation of the Redox Reactions of Neptunium in Nitric Acid Solutions

The redox reactions of neptunium with U(VI), U(IV), nitrite ions and hydrazine are slow and may cause an unexpected extraction behaviour of the neptunium which is present in the PUREX process in very low concentrations of the order of 10" to 10" M. In order to study the redox reactions of neptunium, a suitable analytical method for simultaneous determination of Np(IV), Np(V) and Np(VI) in this low concentration range has to be applied. Such a method was developed in a previous investigation [2]. The aim of this work was to demonstrate the applicability of this method for the study of the influence of uranyl nitrate, sodium nitrate, ion(II) sulfamate, hydrazine and uranium(IV) nitrate on the redox reactions of neptunium in nitric acid solutions as a function of time.