Simultaneous separation of yttrium and lanthanide ions by isotachophoresis
Simultaneous separation of yttrium and lanthanide ions by isotachophoresis
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通过等速电泳同时分离钇和镧系离子
DOI：
10.1016/s0021-9673(97)00055-1
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发表时间：
1997
影响因子：
4.1
通讯作者：
Yoshio Hashimoto
中科院分区：
文献类型：
--
作者：
T. Hirokawa;Yoshio Hashimoto
通过在 α-羟基异丁酸 (HIBA) 电解质系统中添加辅助络合剂，开发了一种可操作的电解质系统，用于等速电泳分离 15 种稀土元素（钇和镧系元素，除 Pm 外）。通过测试丙二酸、苹果酸、丙二酸和乙醇酸等多种助剂，优化的主导电解质是含有 2 mM 丙二酸和 7.5 mM HIBA（pH 4.8，2-乙基丁酸缓冲液）的 20 mM 氨溶液。终止剂是 20 mM 肉碱盐酸盐。根据等速电泳法评估稀土-丙二酸配合物的稳定常数，成功分离是由于与待分离的中等稀土元素相比，Y-丙二酸配合物的稳定常数较小。
An operational electrolyte system was developed for the isotachophoretic separation of fifteen rare-earth elements (yttrium and lanthanides except for Pm) by adding a helping complexing agent to an α-hydroxyisobutyric acid (HIBA) electrolyte system. As a result of testing several helping agents such as malonic acid, malic acid, tartronic acid and glycolic acid, the optimized leading electrolyte was a 20-mM ammonia solution containing 2 mM malonic acid and 7.5 mM HIBA (pH 4.8, 2-ethylbutyric acid buffer). The terminator was a 20-mM carnitine hydrochloride. According to the stability constants of rare-earth–malonate complexes evaluated by isotachophoretic method, the successful separation was due to the smaller stability constants of Y–malonate complexes compared with those of the medium lanthanide elements to be separated.