Determination of Chlorine Dioxide in Process Gas with a Large Excess of Chlorine by a Voltammetric Membrane Electrode

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Chlorine dioxide (ClO_2) in a gas exhausted from a factory involved in the electrolytical soda process was measured. Three absorbing vessels connected in series were used for the simultaneous collection of ClO_2 and chlorine. Two vessels contained water to collect ClO_2 and coexisting chlorine, and the third one contained dimethylsulfoxide (DMSO) to capture ClO_2. DMSO was useful as an absorbing solution for ClO_2,because more ClO_2 was captured and remained in DMSO than in water. Moreover, DMSO eliminated interference from the coexisting chlorine. ClO_2 collected in water was determined by a voltammetric membrane electrode after the addition of DMSO. Chlorine was determined by colorimetry using o-tolidine. The concentrations of ClO_2 and chlorine in process gases ranged from 36 to 116 mg/m^3 and from 16 to 51 g/m^3,respectively.
公益社団法人日本薬学会の論文
1996-10-31