弱碱性阴离子交换树脂的本征解离常数

根据Donnan膜平衡模型及外推法提出弱碱性阴离子交换树脂本征解离常数的测定方法。并测得大孔丙烯酸系弱碱性阴离子树脂D705的本征解离常数的负对数pK_b~(int)为3.72士0.04,结果表明,Marinsky在测弱酸性阳离子树脂的pK_a~(int)时,引入交换剂相中H~+及Na~+的活度系数相等的假定并非必要。

Intrinsic Dissociation Constant of Weakly Basic Anion Exchange Resin

The general procedure is developed with which the intrinsic dissociation constants of weakly acidic and basic ion exchange resins can be determined without assuming the activity coefficient of M4" (or X-) ion equal to that of H+(or OH-) ion in the resin phase. The procedure is based on the application of the Donnan membrane equilibrium equation and the extrapolation.In this paper, the intrinsic dissociation constant of the weakly basic anion exchange resin D705 was determined, and the water sorption, electrolyte sorption and titration curve of the resin D705 are studied in conjunction with the varying degree of neutralization.