Salt effects on the protonation of polymethacrylate and Na(+), K(+), Ca(2+) complex formation

被引：16

作者：

Daniele, PG

De Stefano, C

Ginepro, M

Sammartano, S

机构：

[1] Univ Messina, Dipartimento Chim Inorgan Chim Analit & Chim Fis, I-98166 Messina, Vill S Agata, Italy

[2] Univ Turin, Dipartimento Chim Analit, I-10125 Turin, Italy

来源：

FLUID PHASE EQUILIBRIA | 1999年 / 163卷 / 01期

关键词：

polymethacrylic acid; protonation constants; medium effects on protonation constants; calcium complexes;

D O I：

10.1016/S0378-3812(99)00221-6

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The protonation of polymethacrylic acid (W similar to 230 000) has been studied potentiometrically [(H(+))-glass electrode] in different aqueous salt solutions (NaCl, KCl, Et(4)NI; 0 less than or equal to I less than or equal to 0.5 mol dm(-3)) at 25 degrees C. Measurements have been performed also for polymethacrylic acid (PMA)-CaCl(2) mixtures (PMA/Ca(2+) = 0.5-3) at I = 0.1 mol dm(-3) (NaCl). The potentiometric data have been analyzed first by using the three-parameters model of Hogfeldt for apparent protonation constants, and then differences in different media have been interpreted in terms of complex formation, Formation constants are reported for Na(+), K(+) and Ca(2+) complexes. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：127 / 137

页数：11

共 19 条

[1]

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[2]

Daniele P.G., 1997, CURR TOP SOL CHEM, V2, P253

[3] ON THE POSSIBILITY OF DETERMINING THE THERMODYNAMIC PARAMETERS FOR THE FORMATION OF WEAK COMPLEXES USING A SIMPLE-MODEL FOR THE DEPENDENCE ON IONIC-STRENGTH OF ACTIVITY-COEFFICIENTS - NA+, K+, AND CA-2+ COMPLEXES OF LOW-MOLECULAR WEIGHT LIGANDS IN AQUEOUS-SOLUTION [J].