Acid-base equilibria of phthalic acid in saline media: ion association from Pitzer-equations

被引：15

作者：

Rey-Castro, C ^{[1
]}

Castro-Varela, R ^{[1
]}

Herrero, R ^{[1
]}

de Vicente, MES ^{[1
]}

机构：

[1] Univ A Coruna, Fac Ciencias, Dept Quim Fis & Enxeneria Quim 1, La Coruna 15071A, Spain

来源：

TALANTA | 2003年 / 60卷 / 01期

关键词：

acid-base equilibria; phthalic acid; ion association; Pitzer equations; ionic strength effects;

D O I：

10.1016/S0039-9140(03)00040-7

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The protonation constants of 1,2-benzenedicarboxylic acid (phthalic acid) at 25 degreesC in NaCl and CaCl2 (ionic strengths ranging from 0.1 to 2 mol kg(-1)) were determined potentiometrically, and the results were analyzed by means of Pitzer equations. The values of the logarithm of the first and, second dissociation constants ranged from 2.730 and 4.948 (in 0.101 mol kg(-1) NaCl to 2.449 and 3.984 (in 0.624 mol kg(-1) CaCl2), respectively. Tabulated interaction parameters for the inorganic species involved along with salting coefficients estimated from literature allowed the calculation of new interaction parameters for the phthalate-Na+/Ca2+ systems. The specific ion interaction model considered seems to account for the influence of the formation of weak complexes of plithalate with calcium ions on the equilibrium constants. (C) 2003 Elsevier Science-B.V. All rights reserved.

引用

页码：93 / 101

页数：9

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