冠醚萃取体系中锂的同位素效应──混合锂盐效应  

LITHIUM ISOTOPE EFFECT IN THE EXTRACTION SYSTEMS OF CROWN ETHERS ──EFFECT OF MIXED SALTS OF LITHIUM

作　　者：方胜强[1] 傅立安[1] 

机构地区：[1]兰州大学现代物理系

出　　处：《同位素》1994年第3期168-171,共4页Journal of Isotopes

摘　　要：研究了冠醚萃取体系中的混合理盐效应。用４－叔丁基苯并－１５冠－５和４－甲基苯并－１５－冠－５的碘代苯溶液作萃取剂，分别萃取ＬｉＳＣＮ、ＬｉＣｌＯ＿４、ＬｉＳＣＮ＋ＬｉＮＯ＿３、ＬｉＣｌＯ＿４＋ＬｉＮＯ＿３、ＬｉＣｌＯ＿４＋ＥＤＴＡ和ＬｉＮＯ＿３等水溶液中的锂。测定了平衡有机相中理的浓度Ｃ＿０、分配比Ｄ、锂的同位素分离系数α以及冠醚分离锂同位素的能力ε＿ｐ。通过对比单一Ａ类锂盐体系和混合锂盐体系的相应参数确定混合理盐效应的存在及其大小。结果表明，在冠醚萃取体系中适当选用混合锂盐料液可以比选用单一锂盐料液能获更大的α和ε＿ｐ值。The mixed effect of two sorts of lithium salt in crown ether extraction systems has been exam-ined. A solution of 4-tert-butylbenzo-15-crown- 5 or 4-methylbenzo-15-crown- 5 in C_6H_5I was usedas extractant, and contacted with the aqueous solution of lithium salts which are LiSCN, LiClO_4,LiCN+LiNO_3,LiClO_4+LiNO_3 or LiClO_4+Li-EDTA,respectively.Some parameters includinglithium concentration in organic phase C_0,destribution ratio D, isotope separation factor of lithium α,and isotope separation ability of crown ether to lithium ε_p,were determined. Comparing the parame-ters between systems of unitary salt and mixed salts the existence and magnitude of mixed salt effecthave been confirmed. It has been established that the values of αandε_p obtained in systems of mixedsalts is greater than that of unitary salt,and that the values of C_0 and D are slightly decreased,as ap-propriate lithium salts were selected to be used in the extraction systems of crown ethers.

关 键 词：冠醚 锂同位素 同位素效应 萃取 

分 类 号：O615.11[理学—无机化学]