Continuous flow and flow injection potentiometry of complex-bonded metal ions by the standard additions method

Abstract

A new approach is proposed for the description of the dispersion of confluent streams. It offers the possibility to define, theoretically, a standard additions method in continuous flow and flow injection systems. This method allows the application of a single or multiple standard additions techniques as illustrated in the determination of the total content of complex-bonded silver ions in the presence of an excess of sodium thiosulfate. A silver ion-selective electrode was used. The method was checked within the concentration range 10^–6–10^–1 mol l^–1 silver nitrate, the relative error varying between 2 and 8%.