Abstract
A rapid and sensitive electroanalytical method has been developed for measuring free chlorine in water by using a wax‐impregnated carbon electrode. This method can differentiate free chlorine—the sum of OCI and HOCI—from other combined chlorine species. Sodium dichloroisocyanurate, an active chlorine compound widely used in swimming pool disinfection, was chosen as the model system. The method illustrates that when sodium dichloroisocyanurate is dissolved in water it is only partially dissociated into free chlorine, even at a very low concentration. When isocyanuric acid is added to a solution containing free chlorine, the concentration of the latter drops because of the formation of chlorinated isocyanuric acids and salts. The equilibrium states of both the dissociation and formation reactions are rapidly achieved.
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