【摘要】 本文研究了二苯并-18-冠-6对²²Na、⁴⁵Ca、⁸⁶Rb、⁹⁰Sr-⁹⁰Y、¹³⁷Cs和¹⁴⁴Ce等放射性核素的萃取和萃取色层分离。冠醚萃取金属离子具有离子对萃取的特征,据此,选择苦味酸根离子为反离子,以三氯甲烷为溶剂。 测定了30℃时Na⁺、Rb⁺、Cs⁺、Ca²⁺、Sr²⁺和Ce³⁺的萃取平衡常数(K_ex)。对单价和二价金属离子,K_ex次序分另0为;Rb⁺>Cs⁺>Ns⁺和Sr²⁺>Ca²⁺。 使用二苯并-18-冠-6的萃取色层有效地分离了²²Na-¹³⁷Cs、⁴⁵Ca-⁹⁰Sr和¹⁴⁴Ce-⁹⁰Sr-⁹⁰Y。更多还原

【Abstract】 The extraction and chromatographic separation of several radionuclides (22Na, 46Ca, 86Rb, 90Sr-90Y, 137Cs, 144Ce) with dibenzo-18-crown-6 have been investigated. Considering that the extraction of metal ion by the crown ether has the character of ion-pair extraction, the picrate ion was chosen as the counter ion. The solvent was chloroform. The extraction equilibrium constants (Kex) for Na+, Rb% Cs+, Ca2+, Sr2+ and Ce3+ have been determined at 30℃. The Kex sequences of the monovalent and bivalent metal ions are Rb+>Cs + >Na+, Sr2 + >Ca2+ respectively. 22Na-137Cs, 45Ca-90Sr and 144Ce-90Sr-90Y can be effectively separated by extraction chromatography with dibenzo-18-crown-6.更多还原