Study on Coordination Characteristics of Neptunium and Uranium Ions in Calcium Nitrate Hydrate Melt by Raman Spectrometry and UV/Vis/NIR Spectrometry
Study on Coordination Characteristics of Neptunium and Uranium Ions in Calcium Nitrate Hydrate Melt by Raman Spectrometry and UV/Vis/NIR Spectrometry
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拉曼光谱和紫外/可见/近红外光谱研究硝酸钙水合物熔体中镎和铀离子的配位特性
DOI：
10.1088/1757-899x/9/1/012061
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
and H. Yamana
中科院分区：
文献类型：
--
作者：
T. Fujii;G. Okude;A. Uehara;and H. Yamana
研究了磷酸三丁酯从水合硝酸钙熔体中萃取镎的行为。Np的分配率随含水量的降低而增大。在体系中加入硝酸后，分配比增大。为了了解萃取趋势，通过拉曼光谱和UV/维斯/NIR光谱分析水合物熔体中的Np物种。大部分为Np（VI）的NpO 2 2+，小部分为Np（V）的NpO 2+.在拉曼光谱中发现NpO 2 2+在硝酸盐介质中的v1对称振动频率发生了移动.这表明NpO 2 2+的配位环境发生了变化.
Extraction behavior of neptunium (Np) by tri-n-butyl phosphate from calcium nitrate hydrate melt was investigated. Distribution ratio of Np was found to increase with the decrease of water content. Adding nitric acid into the system resulted in an increase of the distribution ratio. In order to understand the extraction trends, Np species in the hydrate melt were analyzed by Raman spectrometry and UV/Vis/NIR spectrometry. Major fraction was assigned to be NpO 2 2+ of Np (VI) and small fraction to be NpO 2+ of Np (V). A shift of the v 1 symmetric vibrational frequency of NpO 2 2+ in nitrate media was found in Raman spectra. This suggests a coordination circumstance change of NpO 2 2+.