Theoretical equations for electrochemical processes preceded by concurrent first-order chemical reactions in DC polarography: Application to the study of the interaction between guanine and diacetyl

Abstract

Theoretical expressions are derived for electrochemical processes preceded by two concurent first-order chemical reactions in dc polarography by using both the approximation of convective diffusion under the steady state conditions and the dimensionless differential equations of the Nernst diffusion layer approximation. These equations are formally identical to those obtained for CE and CEC processes, with differences only in the kinetic terms. Study of the interaction between guanine and diacetyl shows the usefulness of these equations. A value of 7 × 104 M is obtained for the formation constant of the adduct guaninediacetyl at 25°C.