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.
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