Assessment of mixing efficiency using the oxidation of iodide by hydrogen peroxide

Abstract

A method of assessing mixing efficiency in spectrophotometric cells is described. The rate at which iodide is oxidised by hydrogen peroxide, indicated by the time taken to consume a finite amount of thiosulphate, was found to be dependent on mixing efficiency in a system in which force of injection was the sole mixing mode. In the system studied it was shown that mixing to a total volume of 1 ml by injecting less than 0.5 ml is inadequate.