高等学校化学学报 ›› 1981, Vol. 2 ›› Issue (1): 25.

• 论文 • 上一篇    下一篇

稀土元素的电分析化学研究(Ⅰ)——铕的极谱研究

李瑞樑, 高小霞   

  1. 北京大学化学系
  • 收稿日期:1980-07-17 出版日期:1981-01-24 发布日期:1981-01-24

ELECTROCHEMICAL STUDIES OF RARE EARTH ELEMENTS-I——POLAROGRAPHIC STUDY OF EUROPIUM

Li Ruiliang, Gao Xiaoxia(Kao Sheau-shya)   

  1. Department of Chemistry, Beijing University Beijing
  • Received:1980-07-17 Online:1981-01-24 Published:1981-01-24

摘要: 用交流极谱法比较了Eu+3离子在NH4SCN、EDTA-NaCl、DTPA-NaCl三种底液中的极谱行为,其中以在DTPA-NaCl底液中的极谱可逆性为最好。使用DTPA-NaCl底液测定Eu+3的最宜条件为:pH>6.5,NaCl浓度>0.3M,DTPA浓度略大于溶液中全部可与DTPA络合的金属离子的总浓度。在此条件下,用交流极谱或单扫示波极谱法测定Eu+3的下限为2×10-6M,用微分脉冲极谱法测定为2×10-7M。其他稀土离子不干扰。还测定了某些稀土氧化物样品中少量的Eu,得到满意的结果。

Abstract: The ac polarographic behavior of Eu+3 ions in three base solutions (NH4SCN, EDTA-NaCl,DTPA-NaCl) has been compared.In DTPA-NaCl solution the polarographic reversibility of Eu(Ⅲ)is the best among them.The optimun conditions for the polarographic determination of Eu(Ⅲ)are: pH≥6.5, NaCl concentration≥0.3M, the concentration of DTPAshould be slightly higher than the total concentration of all the metal ions which can form complexes with DTPA.Under these conditions, the lower limit of detection of Eu(Ⅲ).is 2×10-6Mby ac polarography or single sweep oscil-lographic polarography, or 2×10-7Mby differential pulse polarography.Other rare earth ions do not interfere.Small amounts of Eu in samples of mixed rare earth oxides were determined by this method with satisfactory results.

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