Reversed flow injection spectrophotometric determination of low residuals of chlorine dioxide in water using chlorophenol red.
A novel, simple, rapid, sensitive and highly selective flow injection procedure for the spectrophotometric determination of chlorine dioxide in the presence of other chlorine species, viz, free chlorine, chlorite, chlorate and hypochlorite, is developed. The method is based on the discoloration reaction between chlorine dioxide and chlorophenol red and can overcome the shortcomings existed in direct spectrophotometric determination for chlorine dioxide owing to the serious interference of free and combined chlorine. The procedure gave a linear calibration graph over the range 0-0.71 mg/L of chlorine dioxide. With a detection limit of 0.024 mg/L and a sample throughput of 60 samples/h.
Wang
Gai-Zhen
GZ
College of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China. wanggaizhen@yahoo.com
Chen
Hui
H
Yuan
Li
L
Li
Guo-Dong
GD
D017606:Chlorine Compounds / Q000032:analysis*; D019551:Dental Disinfectants / Q000032:analysis*; D004784:Environmental Monitoring / Q000379:methods; D010087:Oxides / Q000032:analysis*; D010637:Phenolsulfonphthalein / Q000031:analogs & derivatives* / Q000737:chemistry; D012680:Sensitivity and Specificity; D013053:Spectrophotometry / Q000379:methods; D014874:Water Pollutants, Chemical / Q000032:analysis*
D017606:Chlorine Compounds; D019551:Dental Disinfectants; D010087:Oxides; D014874:Water Pollutants, Chemical; C007016:chlorophenol red; C025109:chlorine dioxide; D010637:Phenolsulfonphthalein