A Batch-Wise Flow Analyzer for the Determination of Chloride in Potable Waters Using Differential Electrolytic Potentiometry

A batch-wise flow system for the determination of chloride in drinking water is described. For the first time, a sequential injection analysis performed using a programmable syringe pump is used to replace the sequential injection instrument. Direct current differential electrolytic potentiometry was applied as a detector. The heights of the resulting differential curves were found to be affected by different experimental conditions such as the current density, the flow rate and the concentrations of the solutions used. These conditions were carefully optimized by applying the univariate method. A current density of 1.18 μA cm^-2, a flow rate of 600 ml min^-1 and a concentration range of 2.83-14.03 μg ml^-1 were found to be the optimum conditions. A combination of Ag-AgCl electrodes using the direct current polarization was found to give excellent results. The limit of detection of chloride was found to be 0.93 μg ml^-1.