Abstract

Electrochemical techniques are being used today to measure the kinetics of homogeneous chemical reactions [1, 2]. The value of one of the techniques, current reversal chronopotentiometry (CRC), has been demonstrated with the study of several chemical systems [3, 4]. Recently, a circuit designed for cyclic chronopotentiometry (CC) utilizing tube-type operational amplifiers was published [5]. This circuit of course is also suitable for CRC and in fact has been used to elucidate the mechanism of the loss of water from p-hydroxyaminophenol [6]. The main disadvantage of this circuit is that the experiment is initiated by unshorting the electrochemical cell. Undesirable galvanic reactions are possible at the working electrode when it is shorted to the unpoised auxiliary electrode [7]. This has been circumvented by making the auxiliary electrode a large area reference electrode. However, this can be inconvenient and, moreover, is disastrous if appreciable reactions can proceed at zero volts vs. the particular re...

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