高等学校化学学报

高等学校化学学报 ›› 1985, Vol. 6 ›› Issue (6): 484.

• 研究简报 • 上一篇    下一篇

pH电位法研究络合物稳定常数——一种新的数据处理方法的尝试

关鲁雄, 陈克英   

  1. 中南矿冶学院化学系
  • 收稿日期:1983-11-02 出版日期:1985-06-24 发布日期:1985-06-24

Study of pH-Potentiometric Method Determination of Stability Constants of Complexes --A New Method of Treatment of Experimental Data

Guan Luxiong, Chen Keying   

  1. Department of Chemistry, Central-South Institute of Mining and Metallurgy, Chanysha
  • Received:1983-11-02 Online:1985-06-24 Published:1985-06-24

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摘要： 在水溶液的络合平衡研究中,pH电位法得到广泛应用,但有一定局限性。G·Shwarzenbach提出的pH-pM同时测定法原则上可以处理多级酸式络合常数,但实验受到仪器的限制。借助徐光宪[4]的络合物吸附平衡理论可以将Y0(Frouaeus函数)与nL(生成函数)相联系,从而可能将上述两种方法沟通起来[2]。但文献[2]所介绍的方法只适于求各级正常络合物常数。

Abstract: An improved method for the determination of the stability constants of complexes has been presented by combining the principles of pH-potentiometric method and the method of simultaneous measurement of pH-pMvalues. Only pHvalues have to be measured during the titration, but the volumes of the titrant added be recorded. The method has been applied to complex system Cd(Ⅱ)-Citric acid at 25±0.5℃ and the ionic strength 1.0. The results arc practically consistent with the values obtained by previous works.

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