Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Bombay-400085, India.
Talanta. 1998 Dec;47(5):1271-8. doi: 10.1016/s0039-9140(98)00215-x.
Ion-pair extraction behaviour of uranyl ion from aqueous solutions was studied at pH 3.0 employing crown ethers viz. benzo 15 crown 5 (B15C5), 18 crown 6 (18C6), dibenzo 18 crown 6 (DB18C6), and dibenzo 24 crown 8 (DB24C8) in chloroform as the organic phase and picric acid as the organophilic counter anion. The stoichiometry of the extracted species corresponded to UO(2)(crown ether)(n).pic(-) where n=1.5 for benzo 15 crown 5 and 1 for 18 crown 6 as well as dibenzo 18 crown 6. Adducts of DB24C8 could not be observed as practically no extraction was possible using this reagent. The separation behaviour of fission products from an irradiated uranium target was also studied. An interesting observation on the separation of trivalent lanthanides from uranyl ion is reported.
采用冠醚（如苯并-15-冠-5（B15C5）、18-冠-6（18C6）、二苯并-18-冠-6（DB18C6）和二苯并-24-冠-8（DB24C8））作为有机相，苦味酸作为亲有机抗衡阴离子，在 pH 3.0 下研究了铀酰离子从水溶液中的离子对萃取行为。萃取物种的化学计量比为[UO（2）（冠醚）（n）]（2+）。[pic（-）]（2），其中 n=1.5 对于苯并 15 冠 5 和 18 冠 6 以及二苯并 18 冠 6。DB24C8 的加合物不能被观察到，因为使用该试剂实际上不可能进行萃取。还研究了从辐照铀靶中分离裂变产物的行为。报告了从铀酰离子中分离三价镧系元素的有趣观察结果。
