摘要：Several kinds of absorbents, which were used for the determination of chlorine in the air by the pyridine·pyrazolone method, were investigated. Among p-toluenesulfonamide, sulfamic acid, 5, 5-dimethylhydantoin, isocyanuric acid and succinimide, only p-toluenesulfonamide was useful for the absorbent ; the others were useless because of a consumption of chlorine, a slow formation velocity of cyanogen chloride or an instability of chlorine. Furthermore, most of commercial potassium cyanides, which were also used for the determination method, were found to contain a reducing impurity. The impurity was a sulfite ion, and its content ranged from 100μg to 1400μg per 1 g of each potassium cyanide tested.
