. On the other hand, Anik [28], on
the basis of open circuit potential measurements in a broad seriesof standard buffer solutions (pH 1–13), reported almost Nernstian
behavior of metallic W electrode. Dimitrakopoulos et al. evidenced
that the interferences with dissolved O2 affected the sensitivity of
tungsten oxide in pH measurements [27]. Another analytical application
of metallic W electrode was recently reported by our group
[31], relating to the applicability of W disk electrode for hydrodynamic
amperometric detection of OH ions in the concentration
range between 103 mol dm3 and 0.1 mol dm3
. The method is
based on the linear relationship between the concentration of
OH ions and the limiting current density of anodic dissolution
of tungsten. Nevertheless, the response of such sensor was found
to depend on the ionic strength of the solution, making the calibration
necessary, since the theory of W anodic dissolution is not at
the adequate level, yet.
In