FLOW-INJECTION ANALYSIS FOR RESIDUAL CHLORINE USING PB(II) ION-SELECTIVE ELECTRODE DETECTOR

A simple flow injection analysis (FIA) system for residual chlorine in tap water has been developed by using a Pb(II) ion-selective electrod e (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 lin ear working curve between peak height and concentration of residual ch lorine was obtained from 0.1 to 1 mg l(-1) for the developed FIA syste m. The relative standard deviation for repeated injections of a 0.2 mg l(-1) residual chlorine sample was 2%. The regression line and its co rrelation factor between the conventional o-tolidine colorimetric meth od and the present method were Y = 0.75X + 0.17 and 0.967, respectivel y, for this determination. (C) 1998 Elsevier Science B.V.