Determination of ion exchange equilibrium constants of strongly acidic resins with alkaline-earth metals by means of the potentiometric titrations technique

被引：4

作者：

Borge, G ^{[1
]}

Arana, G ^{[1
]}

Fernández, LA ^{[1
]}

Madariaga, JM ^{[1
]}

机构：

[1] Univ Basque Country, EHU, Kim Analitikoaren Dept, E-48080 Bilbao, Spain

来源：

TALANTA | 1999年 / 48卷 / 01期

关键词：

ion exchange equilibrium constants; potentiometry; ionic strength; methods of calculation;

D O I：

10.1016/S0039-9140(98)00219-7

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

(A) recently developed methodology for the determination of ion exchange equilibrium constants has been applied to ion exchange systems of 1:2 stoichiometry. Potentiometric titrations with variable ionic strength were carried out. Ionic medium titrations were performed for the estimation of the liquid junction potential. The modified Bromley's methodology and the Wilson model were used for the estimation of the activity coefficients of the species in the aqueous and resin phase, respectively. A modification of the Henderson equation is used for the estimation of liquid junction potentials in the mixtures including 1:2 electrolytes. Equilibrium constants for the H+/M2+ (M = Mg, Ca, Sr and Ba) exchange systems in the strongly acidic resins Dowex CM-15 and Dowex C650 were studied. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：91 / 102

页数：12

共 21 条

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