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首页> 外文期刊>RSC Advances >Recent advances in f-element separations based on a new method for the production of pentavalent americium in acidic solution
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Recent advances in f-element separations based on a new method for the production of pentavalent americium in acidic solution

机译：基于在酸性溶液中生产五价a的新方法，f元素分离的最新进展

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摘要

The peroxydisulfate anion has long been used for the preparation of hexavalent americium (Am-VI) from the normally stable Am-III valence state in mildly acidic solutions. However, there has been no satisfactory means to directly prepare the pentavalent state (Am-V) in that medium. Some early literature reports indicated that the peroxydisulfate oxidation was incomplete, and silver ion catalysis in conjunction with peroxydisulfate became accepted as the means to ensure quantitative generation of Am-VI. Incomplete oxidation would be expected to leave residual Am-III, or to produce Am-V in treated solutions. However, until recently, the use of peroxydisulfate as an Am-V reagent has not been reported. Here, parameters influencing the oxidation were investigated, including peroxydisulfate and acid concentration, temperature, duration of oxidative treatment, and the presence of higher concentrations of other redox active metals such as plutonium. Using optimized conditions determined here, quantitative Am-V was prepared in an acidic solution and the UV/Vis extinction coefficients of the Am-V 513 nm peak were measured over a range of nitric acid concentrations. The utility of Am-V for separations from the lanthanides and curium by solvent extraction, organic column chromatography and inorganic ion exchangers was also investigated.
机译：过氧化二硫酸根阴离子长期以来一直用于在弱酸性溶液中由通常稳定的Am-III价态制备六价meric（Am-VI）。但是，还没有令人满意的方法直接在该介质中制备五价态（Am-V）。一些早期的文献报道表明过氧二硫酸盐的氧化是不完全的，银离子催化与过氧二硫酸盐的结合已被接受为确保定量生成Am-VI的手段。预计不完全氧化会留下残留的Am-III，或在处理过的溶液中产生Am-V。然而，直到最近，还没有报道过氧二硫酸盐用作Am-V试剂。在这里，研究了影响氧化的参数，包括过氧二硫酸盐和酸的浓度，温度，氧化处理的持续时间，以及更高浓度的其他氧化还原活性金属（例如p）的存在。使用此处确定的优化条件，可以在酸性溶液中制备定量的Am-V，并在一定范围的硝酸浓度下测量Am-V 513 nm峰的UV / Vis消光系数。还研究了Am-V通过溶剂萃取，有机柱色谱和无机离子交换剂从镧系元素和cur中分离的效用。

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