Hexapropyl phosphoramide (HPPA) and hexabutyl phosphoramide (HBPA) were examined for the macrolevel extraction and stripping of tetravalent metal ions such as Pu(IV) and Th(IV). The solvation number of Pu(IV) with both the phosphoramides were measured. The number of stages was evaluated for the quantitative extraction and stripping of Pu(IV) and Th(IV) in cross-current mode with 1.1 M phosphoramides in xylene from the nitric acid medium. The distribution ratios for the extraction of Th(IV) were measured with 1.1 M phosphoramides in xylene as a function of equilibrium aqueous phase Th(IV) and nitric acid concentration. In addition, distribution ratios for the extraction of fission product elements such as Zr, Tc, Ru, lanthanides (La, Pr, Nd and Gd) and activation product Am were also measured with 1.1 M HPPA and HBPA in n -Dodecane ( n -DD) system as a function of aqueous phase nitric acid concentration. The extraction data generated with phosphoramides were compared with a 1.1 M TBP/ n -DD system.

中文翻译：

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六丙基和六丁基磷酰胺对 Pu(IV)、Th(IV) 和裂变产物元素的萃取行为

检查了六丙基磷酰胺 (HPPA) 和六丁基磷酰胺 (HBPA) 对四价金属离子（如 Pu(IV) 和 Th(IV)）的宏观萃取和剥离。测量了 Pu(IV) 与两种磷酰胺的溶剂化数。使用 1.1 M 磷酰胺在二甲苯中从硝酸介质中以交叉流模式定量萃取和汽提 Pu(IV) 和 Th(IV) 的阶段数进行了评估。作为平衡水相 Th(IV) 和硝酸浓度的函数，用 1.1 M 磷酰胺在二甲苯中测量 Th(IV) 提取的分布比。此外，提取裂变产物元素如 Zr、Tc、Ru、镧系元素（La、Pr、Nd 和 Gd）和活化产物 Am 的分配比也测量为 1。正十二烷 (n -DD) 系统中的 1 M HPPA 和 HBPA 作为水相硝酸浓度的函数。用磷酰胺产生的提取数据与 1.1 M TBP/n -DD 系统进行了比较。