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5440975 
Journal Article 
Extraction spectrophotometric determination of trace chlorine dioxide with methylene blue 
Chen, H; Wang, GZ; Yuan, L 
1997 
Yes 
Analytical Letters
ISSN: 0003-2719
EISSN: 1532-236X 
30 
7 
1415-1421 
English 
WOS:A1997XA89800014 
BIOSIS COPYRIGHT: BIOL ABS. The coloration reagent - leucomethylene blue, the reduction product of methylene blue, is used to determine the concentration of chlorine dioxide in the presence of Cl2 and anion species such as OCl-, ClO2- and ClO3-. This simple spectrophotometric method is performed by using the extractant 1,2-dichloroethane at pH 1.3. The linear range of ClO2 measurement extends to 0.95 mgl-1 with a detection limit of 0.02 mgl-1. The presence of chlorine and hypochlorite ion can be masked by oxalic acid. The permissible maximum concentration of ClO2- is 2.0 mgl-1, and ClO3- anion does not interfere with the measurement. 
chlorine dioxide; extraction spectrophotometry; methylene blue