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
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.