Crown ether-loaded polysulfone (PS) capsules suitable for the separation and preconcentration of strontium from acidic nitrate media have been prepared and characterized. Specifically, PS macro- and microcapsules have been impregnated with the macrocyclic polyether di-tert-butylcyclohexano-18-crown-6 (DtBuCH18C6), either undiluted or as a solution in 1-octanol, and their performance in the extraction of strontium from nitric acid solution evaluated. The DtBuCH18C6-loaded microcapsules were found to exhibit strontium uptake efficiency significantly greater than that observed for the analogous macrocapsules, confirming earlier observations of a marked size-dependence of the behavior of extractant-loaded PS capsules. Comparison of the microcapsules to a commercial extraction chromatographic (EXC) material (Sr-resin) comprising DtBuCH18C6-loaded beads of poly(methyl methacrylate) (PMMA) of comparable size (50–100 μm), showed that the two materials exhibit similar strontium retention, uptake kinetics, and selectivity. The microcapsules provide higher column efficiencies, however, and when fully loaded with extractant, higher strontium ion uptake capacity.

制备并表征了适用于从酸性硝酸盐介质中分离和预富集锶的冠醚型聚砜（PS）胶囊。特别是，PS的大胶囊和微胶囊已用大环聚醚二元醇浸渍-丁基环己酮-18-冠-6（DtBuCH18C6）或未稀释或在1-辛醇中的溶液，并评估了它们在硝酸溶液中萃取锶的性能。发现载有DtBuCH18C6的微胶囊显示出的锶吸收效率显着高于类似的大胶囊所观察到的锶吸收效率，从而证实了载有萃取剂的PS胶囊的行为具有明显的尺寸依赖性。将微胶囊与市售提取色谱（EXC）材料（Sr-树脂）进行比较，该材料包含DtBuCH18C6负载的可比较大小（50-100μm）的聚（甲基丙烯酸甲酯）（PMMA）珠，这两种材料均表现出相似的锶保留，吸收动力学和选择性。微囊提供了更高的色谱柱效率，但是，当完全充满萃取剂时，