新型水杨酸根离子选择性电极的研究

A New Salicylate Ion Selective Electrode

本文报道了基于Mn(Ⅲ)Schiff碱为中心载体的新型溶剂聚合膜离子选择性电极。电极对水杨酸根离子(Sal-)具有优良的电位响应特性并呈现反Hofmeister选择性行为。电极在pH5.5的磷酸盐缓冲体系中,对Sal-在1.0×10-1～2.0×10-5mol·L-1浓度范围内呈近能斯特响应,斜率为-51mV/p[Sal-],检出限为8.0×10-6mol·L-1。电极具有响应快、重现性好、制备简单等优点。将电极初步应用于药物分析,得到较满意的结果。

The present paper describes a new solvent polymeric membrane anion selective electrode based on Schiff base complexes of Mn(Ⅲ) as neutral carriers, which demonstrates excellent selectivity toward the salicylate ion (Sal^(-)). The electrode exhibits a near-Nernstian potentiometric response in the range of 1.0×10^(-1)～2.0×10^(-5 )mol·L^(-1) Sal^(-) with a detection limit of 8.0×10^(-6 )mol·L^(-1) and a slope of -51 mV/p in pH 5.5 of phosphate buffer solution at 20℃. The response mechanism of the electrode was also studied with the a.c. impedance and spectroscopic techniques. The electrode can be applied to medicine analysis and the result obtained is fair agreement with that given by titration method.