Abstract
We have deduced in pulse polarography, and in a rigorous way, a general equation for instant current in an electrode reaction coupled with a preceding first-order chemical reaction. That equation has been derived with the condition (k1+k2)≫1, k1 and k2 being the rate constants of the chemical reaction. We prove too, that the equation previously derived by Brinkman and Los for this kind of process is only a particular case of ours. Moreover, our equation, when the time elapsed without voltage application to the mercury drop is null, is in excellent agreement with that of Koutecký for normal polarography. Finally, our equation can also be applied to the calculation of the current of an irreversible electrode reaction, provided that the parameters here involved be adequately modified.
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