A solid state Cr(VI) ion-selective electrode based on polypyrrole

被引：15

作者：

Ansari, Reza ^{[1
]}

Delavar, Ali Fallah ^{[1
]}

Mohammad-khah, Ali ^{[1
]}

机构：

[1] Univ Guilan, Fac Sci, Dept Chem, Rasht, Iran

来源：

MICROCHIMICA ACTA | 2012年 / 178卷 / 1-2期

关键词：

Modified electrode; Polypyrrole/chromate; Cr(VI) sensor; Potentiometry; ELECTROCHEMICAL SENSORS; EXCHANGE PROPERTIES; POLYMER; CHROMIUM; LIQUID; FILM; ELECTROPOLYMERIZATION; POLYANILINE; EXTRACTION; SPECIATION;

D O I：

10.1007/s00604-012-0802-9

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

We report on a graphite electrode onto which polypyrrole was electrodeposited and then doped with chromate ion. This electrode can serve as a Cr(VI)-selective solid-state electrode. Electropolymerization of pyrrole was performed potentiostatically at 0.80 V (vs. SCE) using battery graphite as the working electrode in a solution containing 0.10 M of pyrrole and 20 mM of chromate. A platinum wire was used as an auxiliary electrode. The new electrode displays high selectivity, a very wide dynamic range, a sufficiently fast response time and a good shelf lifetime. It shows a linear Nernstian response over 1.0 x 10(-6) to 1.0 x 10(-1) M concentration range (with a slope of 26.55 +/- 0.20 mV per log of concentration). The detection limit is 0.5 mu M, and the pH optimum is 7.0.

引用

页码：71 / 79

页数：9

共 45 条

[1] Towards a monolithically integrated microsystem based on the green tape ceramics technology for spectrophotometric measurements. Determination of chromium (VI) in water [J].