Response of an iridium oxide pH-sensor in nonaqueous solutions. Comparison with other pH-sensors

被引：52

作者：

Izutsu, K

Yamamoto, H

机构：

[1] Faculty of Science, Shinshu University, Asahi

来源：

ANALYTICAL SCIENCES | 1996年 / 12卷 / 06期

关键词：

iridium oxide pH-sensor; pH-ISFET; glass electrode; nonaqueous solvent; pH of nonaqueous solutions; potentiometry;

D O I：

10.2116/analsci.12.905

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The response of an iridium oxide (IrO2) pH-sensor (nonaqueous version of METOX, TOA Electronics Ltd.) was studied in various dipolar aprotic solvents. From the potential measurements in picric acid-picrate solutions, it was confirmed to respond in a Nernstian way to the pH in all the solvents studied. The response speed of the IrO2 pH-sensor was compared with that of the glass electrode as well as those of the Si3N4-and Ta2O4-type pH-ISFETs, carrying out acid-base titrations at various speeds of titrant addition. The response speed of the IrO2 pH-sensor was much higher than that of the glass electrode, though it was somewhat lower than those of the pH-ISFETs. The IrO2 pH-sensor responded in a wide pH range, gave reproducible results, needed no pretreatment, and was durable over a year. It is promising for pH measurements in various nonaqueous solutions free from redox systems.

引用

页码：905 / 909

页数：5

共 14 条

[1]

[Anonymous], 1990, IUPAC CHEM DATA SERI

[2]

BATES RG, 1973, DETERMINATION PH THE, P372

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