Abstract

The primary objective of this study was to develop a measurement strategy for a number of chlorinated compounds used in the treatment of drinking water and the bleaching of paper pulp. As the toxicity and permissible exposure level of these products (chlorine gas, chlorine dioxide, hydrochloric acid and chloroform) varies, specific identification and quantification of each of them is essential. The utility of a battery-powered direct-reading monitor to measure these compounds was evaluated in the laboratory. The results indicate that the choice of evaluation method requires knowledge of the specific chlorinated compounds present. Once this is known, the compounds may be measured using an appropriate direct-reading monitor or by standard methods. For example, electrochemical-cell direct-reading monitors are appropriate for the measurement of chlorine or chlorine dioxide, but underestimate true concentrations when both substances are present simultaneously. In cases such as these, standard methods must be used.