引用本文:
陶祖贻, 窦惠源, 王长守. 螯合离子交换树脂的本征质子化常数[J]. 物理化学学报,
1993, 9(04): 516-522.
doi:
10.3866/PKU.WHXB19930417
Citation: Tao Zu-Yi, Dou Hui-Yuan, Wang Chang-Shou. Intrinsic Protonation Constants of Chelating ion Exchange Resin[J]. Acta Physico-Chimica Sinica, 1993, 9(04): 516-522. doi: 10.3866/PKU.WHXB19930417
Citation: Tao Zu-Yi, Dou Hui-Yuan, Wang Chang-Shou. Intrinsic Protonation Constants of Chelating ion Exchange Resin[J]. Acta Physico-Chimica Sinica, 1993, 9(04): 516-522. doi: 10.3866/PKU.WHXB19930417
螯合离子交换树脂的本征质子化常数
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.
English
Intrinsic Protonation Constants of Chelating ion Exchange Resin
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.
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