CEO2 THIN-FILM ELECTRODE WITH A BUILT-IN ELECTROCHEMICALLY RESETABLE OXIDANT FOR POTENTIOMETRIC STRIPPING ANALYSIS

Citation
G. Tavcar et al., CEO2 THIN-FILM ELECTRODE WITH A BUILT-IN ELECTROCHEMICALLY RESETABLE OXIDANT FOR POTENTIOMETRIC STRIPPING ANALYSIS, Analytica chimica acta, 329(3), 1996, pp. 239-245
Citations number
27
Categorie Soggetti
Chemistry Analytical
Journal title
ISSN journal
00032670
Volume
329
Issue
3
Year of publication
1996
Pages
239 - 245
Database
ISI
SICI code
0003-2670(1996)329:3<239:CTEWAB>2.0.ZU;2-W
Abstract
In this work a sol-gel derived CeO2 thin film, deposited on a glass su bstrate, was investigated for its potential use as a working electrode in potentiometric stripping analysis (PSA). The work was focused prim arily on examination of the PSA performance of a CeO2 film electrode, where Ce(TV) can be exploited as a built-in chemical oxidant that can be electrochemically regenerated by the application of an appropriate anodic potential. The CeO2 thin film electrode exhibits a well-defined PSA response to Cu2+ in a solution, chosen as a convenient test catio n. Its electrochemical behaviour in the presence of supporting electro lyte LiCl and Cu2+ was investigated by cyclic voltammetry. It was foun d that a very simple but crucial electrochemical pretreatment and cond itioning of the CeO2 electrode was necessary for its good PSA performa nce. The parameters influencing the PSA signal, such as deposition pot ential and time. were studied. The linearity of the PSA signal versus Cu2+ concentration and its repeatability were also examined and found satisfactory. The suitability of the CeO2 thin film as a mercury free PSA electrode, with no need of an external oxidant, is discussed.