AUTOPROTOLYSIS CONSTANTS AND STANDARDIZATION OF THE GLASS-ELECTRODE IN ACETONITRILE WATER MIXTURES - EFFECT OF SOLVENT COMPOSITION

被引：66

作者：

BARBOSA, J

SANZNEBOT, V

机构：

[1] Department of Analytical Chemistry, University of Barcelona

来源：

ANALYTICA CHIMICA ACTA | 1991年 / 244卷 / 02期

关键词：

VOLTAMMETRY; AUTOPROTOLYSIS CONSTANT; GLASS ELECTRODE; ACETONITRILE;

D O I：

10.1016/S0003-2670(00)82496-4

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Standard e.m.f.s for the cell GE/HCl/AgCl/Ag/Pt (GE = glass electrode) in acetonitrile-water mixtures containing 0-70% (w/w) of acetonitrile were obtained. Values of the autoprotolysis constant, K(ap), of these mixed solvents were also determined from e.m.f. measurements of the cell GE/KCl + KS/AgCl/Ag/Pt. The influence of variations in the solvent composition on pK(ap) values was evaluated. Over the whole of the composition range studied the pK(ap) values were linearly correlated with the mole fraction of acetonitrile and with the reciprocal of the relative permittivity of solvent mixtures. Linear relationships were also obtained for pK(ap) values vs. the Kamlet-Taft pi-star polarizability/dipolarity parameter in the range 0-50% (w/w).

引用

页码：183 / 191

页数：9

共 27 条

[1] INTERMOLECULAR INTERACTIONS IN WATER+ACETONITRILE MIXTURES - EVIDENCE FROM THE COMPOSITION VARIATION OF SOLVENT POLARITY PARAMETERS [J].