Research on Rapid Determination of Total Chlorine and Chlorine Dioxide by DPD Method in Drinking Water

Abstract

Chlorine and chlorine dioxide are widely used for water disinfection nowadays. To establish standard technical process for total chlorine and chlorine dioxide determination, the factors affected total chlorine and chlorine dioxide determination by DPA method were researched in this paper. Temperature should be balanced at 20℃ in determination and pH value should be controlled between 5 and 9. The reaction time should be controlled within 5 minutes for the best results. The interference of metal ions can be eliminated by adding glycine or potassium iodide solution in determination of chlorine dioxide. The results using this method showed no significant difference with using the method GB/T 5749-2006. The research provides support on establishing the standard technical process for rapid determination of total chlorine and chlorine dioxide in drinking water.