At sufficiently positive overpotentials the reduction reaction can be neglected (Tafel region), and one can simplify Eq. 34b to obtain the so-called Koutecký-Levich equation (34c). Since the Koutecký-Levich equation is derived through the Tafel approximation (or more generally for electrochemically irreversible reactions), it can only be used in the Tafel region (or where the reaction is electrochemically irreversible, see also ). This limitation is violated when applying the Koutecký-Levich equation for extracting kinetic parameters through the micropolarization method or the simple B-V fit method at small overpotentials. Examples of this inappropriate application of the Koutecký-Levich equation can be found both for the micropolarization method , , , and for the simple B-V fit method . The Koutecký-Levich compensated curves are lacking the substantial reverse current correction at small overpotentials, leading to an underestimation of the exchange current density (Fig. ). This improper mass-transport compensation procedure has likely stayed unnoticed for two reasons.