Development of low-cost metal oxide pH electrodes based on the polymeric precursor method

被引：79

作者：

da Silva, G. M. ^{[1
]}

Lemos, S. G. ^{[1
]}

Pocrifka, L. A. ^{[1
]}

Marreto, P. D. ^{[1
]}

Rosario, A. V. ^{[1
]}

Pereira, E. C. ^{[1
]}

机构：

[1] Univ Fed Sao Carlos, Lab Interdisciplinar Eletroquim & Ceram, Dept Quim, BR-13560970 Sao Carlos, SP, Brazil

来源：

ANALYTICA CHIMICA ACTA | 2008年 / 616卷 / 01期

基金：

巴西圣保罗研究基金会;

关键词：

pH electrode; metal oxide; iridium; titanium; polymeric precursor method;

D O I：

10.1016/j.aca.2008.03.019

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

in this work, the polymeric precursor method was used to prepare low-cost solid-state sensors for pH determination based on iridium oxide as the main pH sensitive material. The iridium content was reduced with addition of TiO2, forming the binary system IrOx-TiO2, whose electroanalytical properties were evaluated in comparison with a commercial glass pH electrode. The minimum iridium content which gave suitable results was 30 mol%, and the electrode presented Nernstian and fast response in the pH range from 1 to 13, with no hysteresis effect observed. Besides, the electrode showed high selectivity in the presence of alkali ions as Li+, Na+ or K+. The amount of iridium in the prepared electrodes was very small (<0.1 mg),supporting the efficiency of this method on the simple preparation of functional low-cost pH electrodes. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：36 / 41

页数：6

共 55 条

[1] EFFECT OF PREPARATION ON THE SURFACE AND ELECTROCATALYTIC PROPERTIES OF RUO2 + IRO2 MIXED-OXIDE ELECTRODES [J].