Determination of Chlorine Dioxide in Water by Chlorophenol Red Differential Spectrophotometry

Objective To establish differential spectrophotometry method to determine chlorine dioxide(ClO2) in drinking water.Methods The differential spectrophotometry method was conducted to scan in wave length of 574 nm.Results The experiment demonstrated that linear correlation coefficient was high when the ranges were 0.10-0.50 mg/L,0.26-1.31 mg/L,and 0.50-2.70 mg/L,the linearity was good.Conclusion The method has good accuracy and precision,it is suitable for determination of low concentration chlorine dioxide.