The polarographic behavior of the complex form
ed by V(V) and 2,3–dihydroxybenzaldehyde
(2,3–DHBA) in the solution containing acetate buffer (pH
5,2) has been investigated. By means of a.c. polarography, chronovoltammetry and other techniques, it has been
shown that the electrode
process is complicated by
the adsorption of 2,3-DHBA and its vanadium complex. Th
e kinetic and adsorption para
meters of the electrode
process have been determined: adso
rption equilibrium constant B= 1,32⋅105 mol-1⋅dm3, the attraction constant γ = 1,2, the maximum surface concentration Гmax = 9,10
⋅10-11 mol⋅ cm-2; the share of the electrode surface occupied by
one particle of the adsorbed complex S = 1,81 nm2 and the free adsorption energy ∆G = - 39,1 kJ· mol-1.
