高等学校化学学报 ›› 1991, Vol. 12 ›› Issue (7): 853.

• 论文 •    下一篇

丙氨酸稀土二元和三元配合物的pH电位法研究

邓汝温, 吴集贵, 朱元成   

  1. 兰州大学化学系, 兰州, 730000
  • 收稿日期:1990-03-26 出版日期:1991-07-24 发布日期:1991-07-24
  • 通讯作者: 邓汝温
  • 基金资助:

    国家自然科学基金

Studies on Binary and Ternary Complex of Alanine with Rare Earth Ions by pH Potentiometric Method

Deng Ru-wen, Wu Ji-gui, Zhu Yuan-Cheng   

  1. Department of Chemistry, Lanzhou University, Lanzhou, 730000
  • Received:1990-03-26 Online:1991-07-24 Published:1991-07-24

摘要: 本文报道在生理条件下(37℃,I=150mmol/LNaCl)用pH电位法研究Ala-Ln、GIu-Ln及Ala-Glu-Ln中(Ala=L-丙氨酸,Glu=L-谷氨酸,Ln=Ce,Pr,Nd,Y)二元及三元配合物的稳定常数,运用MINIQUAD-82A程序确定粒子组成,并由COMPLEX程序获得配位粒子分布图,结果表明,三价稀土离子形成配合物的稳定顺序为:Ce<Pr<Nd<Y.三元配合物可在较大范围内存在。

关键词: 丙氮酸, 稀土, pH电位法, 三元配合物

Abstract: The binary and ternary stability constants of Ala-Ln, Glu-Ln and Ala-Glu-Ln(Ala=L-alanine, Glu = L-glutamic acid, Ln=Ce, Pr, Nd, Y) were determined by pHpotentiometric method under the physiological condition(37℃,I = 150 mmol/L NaCl) and carbon dioxide was freed by nitrogen gas. The glass electrode was selected and calibrated by program MAGEC and potentiometric data were treated with MINIQUAD-82A. The compositions of complex species in the equilibrium were ascertained by selection of different chemical models and then the distribution curves were obtained by using program COMPLEX and GRAPHIC. The results show the order of the relative stabilities of the complexes in terms of trivalent metal ions: Ce<Pr<CNd<Y. In addition, the ternary complex may exist in a large pHrange.

Key words: Alanine, Rare earth, pH potentiometric method, Ternary complex

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