The Mechanism of Electroanalytical Function of CoO(OH) in the Oxalic Acid Electrochemical Determination and its Mathematical Representation

The mechanism for the electroanalytical function of the cobalt oxy-hydroxycompound in the electrochemical oxidation of oxalic acid was suggested. The mathematical model, describing this process, has been developed and analyzed by means of steady-state stability theory and bifurcation analysis. The behavior of the system was compared with the behavior of analogous systems. The steady-state stability requirements and oscillatory and monotonic instability conditions have been obtained. These instabilities may be caused by surface and electrochemical factor. The oscillation frequency and amplitude are pH-dependent, and the first parameter grows with pH. The pH-range of electroanalytical sensing efficiency was also derived and it is corresponding to moderate alkaline solutions.