MICRODETERMINATION OF BROMINE, CHLORINE, AND CHLORINE DIOXIDE IN WATER IN ANY COMBINATION

Methods employing N,N-diethyl-p-phenylenediamine are described for estimating the concentrations of chlorine dioxide, free available chlorine, and free available bromine in mixtures containing all three components or any combination of two components. In three-component systems chlorine and bromine but not chlorine dioxide are deactivated by malonic acid, permitting direct determination of chlorine dioxide. The sum of all three components is determined in the absence of suppressant. Glycine can be added to suppress chlorine but not chlorine dioxide and bromine. In solutions containing both bromine and chlorine either glycine or N-tert-butylphthalamic acid sodium salt suppresses chlorine reversibly and permits individual estimation of the concentrations of bromine and free and combined chlorine in the same sample. (C) 1994 Academic Press, Inc.