Abstract

Spectrophotometric method has been used to examine valence transformations of neptunium ions in formi acid aqueous solutions under the action of light from a mercury lamp. It was shown that Np(VI) ions are reduced in ~10 min to Np(IV) containing a small amount of (Np(V). Np(V) ions in solutions and suspensions are also effectively reduced to Np(IV). Np(III) appears in a photolysis of Np(IV) ions. In 99.7% HCOOH, the Np(IV) → Np(III) conversion occurs nearly fully. Np(III) ions are unstable and are transformed to Np(IV) in storage. The hydrolysis and polymerization of Np(IV) hinder the reduction of Np(IV) in1 M HCOOH.

中文翻译：

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HCOOH溶液中N离子的光解

摘要

分光光度法已被用于检查汞灯在光的作用下，甲酸水溶液中n离子的价态转化。结果表明，Np（VI）离子在约10分钟内被还原为含有少量（Np（V）的Np（IV）。溶液和悬浮液中的Np（V）离子也被有效还原为Np（IV）。 Np（III）出现在Np（IV）离子的光解中，在99.7％的HCOOH中，Np（IV）→Np（III）的转化几乎完全发生，Np（III）离子不稳定并转化为Np（IV） Np（IV）的水解和聚合反应会阻碍Np（IV）在1 M HCOOH中的还原。