Flow injection analysis for residual chlorine using Pb(II) ion-selective electrode detector.

Abstract A simple flow injection analysis (FIA) system for residual chlorine in tap water has been developed by using a Pb(II) ion-selective electrode (ISE) detector. The method is based on a specific response of the Pb(II)-ISE to residual chlorine. The FIA system consists of a millivolt meter, a peristaltic pump, a Pb(II)-ISE detector and a recorder. A linear working curve between peak height and concentration of residual chlorine was obtained from 0.1 to 1 mg l −1 for the developed FIA system. The relative standard deviation for repeated injections of a 0.2 mg l −1 residual chlorine sample was 2%. The regression line and its correlation factor between the conventional o -tolidine colorimetric method and the present method were Y =0.75 X +0.17 and 0.967, respectively, for this determination.