ABSTRACT
B1.28.1 Introduction Electrochemical methods may be classified into two broad classes, namely potentiometric methods and voltammetric methods. The former involves the measurement of the potential of a working electrode immersed in a solution containing a redox species of interest with respect to a reference electrode. These are equilibrium experiments involving no current flow and provide thermodynamic information only. The potential of the working electrode responds in a Nernstian manner to the activity of the redox species, whilst that of the reference electrode remains constant. In contrast, in voltammetric methods the system is perturbed and involves the control of the electrode potential or the current as the independent variable, and measurement of the resulting current or potential.
