Detection of chlorine species in water by chemiluminescence with electrochemical analyte modification

Abstract

A flow system for the chemiluminescence reaction of Rhodamine 6G and free chlorine in aqueous solution is described. The system was optimized such that a detection limit (signal-to-noise ratio = 3) of 500 µg l^–1 was obtained for free chlorine, and the system was then used to detect bound available chlorine in water by electrochemical conversion to free available chlorine at a platinum electrode followed by chemiluminescence. Principal component analysis allowed the identification of chlorine species from the chemiluminescence voltage curve.