Abstract
A new theory of a second order cathodic stripping reaction accompanied by adsorption of the reacting ligand is developed under conditions of square-wave voltammetry. In the mathematical model, the following reaction is considered: 2L� (ads)�2L�(aq)�Hg(l)�HgL2(s)�2e� The relationships between the properties of the voltammetric response and both the kinetic parameters as well as the parameters of the excitement signal were analyzed. Both reversible and quasireversible redox reactions were examined. Criterions for distinguishing the studied mechanism from the other types of cathodic stripping reactions were established. The phenomenon of a quasireversible maximum was studied in details. The theoretical results are qualitatively compared with the SW voltammograms of 6-propyl-2-thiouracil.
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