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An analytical procedure was devised to determine chlorine dioxide, chlorous acid, and chlorite, chlorate, and chloride ions in composite mixtures. Chlorine dioxide was determined spectrophotometrically at 360 mµ. After the removal of chlorine dioxide by passing air through the solution, the total concentration of chlorous acid and chlorite ion in the solution was determined spectrophotometrically at 250 mµ where the two species have the same molar absorptivity. The total concentration of chlorous acid, chlorite ion, and chlorate ion was determined by iodimetric titration. Chloride ion was determined by the Mohr titration in neutral solution.
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Hong et al. (1968) studied this question.
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