The thermodynamics of extraction of Am(III) and Eu(III) from nitrate solution by neutral phosphorus-based organic compounds

Dale G. Kalina, George W. Mason, E.Philip Horwitz
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引用次数: 12

Abstract

The extraction of Eu(III) and Am(III) from lithium nitrate solution by several neutral phosphorus-based extractants has been studied as a function of temperature in the range of 0–50°C. From the variation of the distribution ratio with temperature the thermodynamic quantities ΔG, ΔH and ΔS have been calculated for these extractions. The results of this study indicate that these two metal ions behave quite similarly in respect to the basicity and the steric bulk of the extractant molecules. Extraction of these metals is enhanced significantly with increasing basicity of the extractant but is inhibited with increasing steric bulk of the phosphorus compounds.

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中性磷基有机化合物从硝酸盐溶液中萃取Am(III)和Eu(III)的热力学研究
研究了几种中性磷基萃取剂对硝酸锂溶液中Eu(III)和Am(III)的萃取作用,并对温度在0 ~ 50℃范围内的变化规律进行了研究。根据分布比随温度的变化,计算了这些萃取物的热力学量ΔG、ΔH和ΔS。本研究结果表明,这两种金属离子在萃取剂分子的碱度和空间体积方面的行为非常相似。随着萃取剂碱度的增加,这些金属的萃取作用显著增强,但随着磷化合物空间体积的增加,这些金属的萃取作用受到抑制。
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