物理化学学报 >> 1993, Vol. 9 >> Issue (04): 516-522.doi: 10.3866/PKU.WHXB19930417

研究论文 上一篇    下一篇

螯合离子交换树脂的本征质子化常数

陶祖贻; 窦惠源; 王长守   

  1. 兰州大学现代物理系，兰州 730000
  • 收稿日期:1992-01-22 修回日期:1992-07-31 发布日期:1993-08-15
  • 通讯作者: 陶祖贻

Intrinsic Protonation Constants of Chelating ion Exchange Resin

Tao Zu-Yi; Dou Hui-Yuan; Wang Chang-Shou   

  1. Department of Modern Physics, Lanzhou University, Lanzhou , People's Republic of China 730000
  • Received:1992-01-22 Revised:1992-07-31 Published:1993-08-15
  • Contact: Tao Zu-Yi

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摘要： 在25 ℃, 分别在水及乙醇-水混合溶剂中, 用电位滴定法研究了国产的含有胺亚二乙酸功能基的大孔螯合树脂D751的质子化反应. 在对树脂相中各组分的活度系数不作任何假定的前提下, 用外推法从表观质子化常数的对数值与滴定度间的关系, 求得了该树脂的三级本征质子化常数. 本文肯定了表观质子化常数对滴定度的依赖性, 合理地解释了在不同溶剂中树脂的酸碱性的变化.

关键词: 螯合离子交换树脂, 表现质子化常数, 本征质子化常数, 水-乙醇混合溶剂

Abstract: The intrinsic protonation constants of three steps of chelating ion exchange resin D751 containing iminodiacetic groups in water and ethanol-water mixtures have been deter-mined at 25 ℃ by potentoimetric titration and by means of the extrapolation procedure without the assumption on the activity coefficients of charged species in the resin phase. The changes in the acid-base properties of the chelating resin D751 in the water and the ethanol-water mixtures have been obse-rved, and the observed effects are explained. The variation of apparent protonation constants with the degree of neutralizaton has been demonstrated.

Key words: Chelating ion exchange resin, Apparent protonation constant, Intrinsic protonation conatant, Ethanol-water mixture solvent