The purpose of this work is to investigate the sorption of americium from model solutions of liquid radwastes using modified solid-phase extracting agents based on TODGA as an alternative method of additional purification of liquid radwaste by removing transuranium elements by means of alkali precipitation. The kinetic parameters of uranium and americium sorption from highly saline weakly acidic (pH ~3.4) model solutions of liquid radwaste with americium content ~0.04 mg/liter were determined for three modified samples synthesized at VNIIKhT and one analog of a TODGA sample from the AXION Company. The time to equilibrium of all experimental samples in terms of americium is almost the same and equals ~240 min. The equilibrium concentration of uranium is reached in approximately 800 min. The salting-out effect in the extraction of uranium and americium from salt solutions is revealed, though this effect is much weaker for uranium than for americium. The most promising sorbent was determined – sample 7. Its distribution factor is 1.4 times higher than that of the AXION sample and the pair distribution factor Am/U is a factor of 2 higher.

中文翻译：

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使用基于 TODGA 的固相萃取剂研究模型液体放射性废物溶液中的镅吸附

这项工作的目的是研究使用基于 TODGA 的改性固相萃取剂从液态放射性废物模型溶液中吸附镅，作为通过碱沉淀去除超铀元素来进一步纯化液态放射性废物的替代方法。对于在 VNIIKhT 合成的三种改良样品和来自 AXION 的 TODGA 样品的一种类似物，测定了镅含量约为 0.04 毫克/升的液态放射性废物的高盐弱酸性（pH ~3.4）模型溶液中铀和镅的吸附动力学参数公司。以镅计，所有实验样品的平衡时间几乎相同，约为 240 分钟。铀的平衡浓度在大约 800 分钟内达到。揭示了从盐溶液中提取铀和镅的盐析效应，尽管这种效应对于铀来说比镅弱得多。确定了最有希望的吸附剂 - 样品 7。它的分布因子是 AXION 样品的 1.4 倍，配对分布因子 Am/U 高 2 倍。