高等学校化学学报 ›› 1992, Vol. 13 ›› Issue (3): 322.

• 论文 • 上一篇    下一篇

微量pH电位滴定测定氨基酸、二肽和三肽与锌(Ⅱ)、镉(Ⅱ)配合物的稳定常数

卢爱茹1, Leslis D.Pettit2, Jan E.Gregor2   

  1. 1. 西北师范大学化学系, 兰州, 730070;
    2. 英国利兹大学化学系
  • 收稿日期:1991-02-05 出版日期:1992-03-24 发布日期:1992-03-24
  • 通讯作者: 卢爱茹

The Determination of Stability Constants of Complexes of Zn(Ⅱ) and Cd(Ⅱ) with Amino-Acids, Dipeptides and Tripeptides by Micro-pH-Potentiometric Titration

LU Ai-ru1, Pettit L. D.2, Gregor J. E.2   

  1. 1. Department of Chemistry Northwest Normal University, Lanzhou, 730070;
    2. School of Chemistry, University of Leeds, Leeds, England
  • Received:1991-02-05 Online:1992-03-24 Published:1992-03-24

摘要: His、Gly-His、Ala-His、Gly-Gly和Gly-Gly-Gly与锌、镉的配合物的稳定常数已有报道[1~7],由于不同作者的实验方法和数据处理方法不同,测定结果也不尽一致.有些数据是用手算方法进行数据处理的,求得的稳定常数可能不够精确.本工作采用文献推荐的微量pH电位滴定技术,对上述配体与Zn(Ⅱ)、Cd(Ⅱ)配合物稳定常数进行了测定.

关键词: 锌(Ⅱ), 镉(Ⅱ), 氨基酸, 二肽, 三肽, 微量pH电位滴定法

Abstract: A potentiometric study on the complexes of His, Gly-His, Ala-His, Gly-Gly and Gly-Gly-Gly with Zn(Ⅱ), Cd(Ⅱ) is reported and small scale (piston buretle or microsyrine) potentiometric titrations were carried out to determine the stability constants of complexes at 25 ℃ and I = 0.10 mol/L (KNO3) conditions.The data treatment were performed with the computer program TITRE and SUPERQUAD on a BBCmicro-computer.The stisfactory results has been obtained by using this method.

Key words: Zinc(Ⅱ), Cadmium(Ⅱ), Amino-acid, Dipeptide, Tripeptide, Micro-pH-potentio-metric titration

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