Abstract
The enhancement of square-wave (SW) voltammetric peak currents caused by adsorption depends on the reversibility of the redox reaction from the adsorbed state. The phenomenon is analysed by a simple mathematical model. The SW characteristics of ten metal ions, Tl(I), Cd(II), Pb(II), Zn(II), UO 2+ 2 Cu(II), In(III), Bi(III), Ni(II) and Co(II), in different electrolytes containing ClO − 4, Cl −, NO − 3 and SO 2− 4 ions are reported. A very high ratio between the SW peak currents of reversible and totally irreversible redox reactions is noticed. An extremely high ratio was observed between the SW responses of Bi(III) in chloride and in perchlorate. These high ratios are attributed to the adsorption of metal ionic species on the DME surface.
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