Mathematical modelling of potentiometric stripping analysis in mechanically mixed solutions

Abstract

A mathematical model of batch potentiometric stripping analysis in a mechanically stirred measuring cell is developed both for the cases when the chemical stripping step takes place in the same solution where electrodeposition has taken place or in a new solution (medium exchange). Analytical solutions of the model for both cases are derived. The model takes into account the additional mercury coating occurring during the elctrodeposition step in the presence of mercury ions. The basic assumptions on which the model is built are the following: (i) the mercury film is ideally mixed during both the processes of electrodeposition and chemical stripping; (ii) the electrode kinetics during the el..