稳定态二氧化氯的测定

Determination of stable chlorine dioxide

用常规法测定成品稳定态二氧化氯的杂质 ,常有干扰。用蒸馏 -滴定法 ,在H2 SO4 等酸性溶液中 ,将ClO2 蒸出 ,吸收于KI溶液中 ,再用Na2 S2 O3标准溶液滴定析出的碘 ,可迅速、方便地测定稳定态二氧化氯。该法NaClO3和NaClO2 杂质无干扰。同时对蒸馏时酸的选择、蒸馏时间。

The final product of stable chlorine dioxide collected contains some interfering substances for determining its concentration with ordinary method. A distillation titration method has been developed. Chlorine dioxide is distilled from H 2SO 4 solution and absorbed by KI solution. Then yield I 2 is determined with Na 2S 2O 3. NaClO 3 and NaClO 2 have no interferance. The concentration of stable chlorine dioxide can be determined rapidly and conveniently. The choice of acid, time of distillation, pH of the solution and the repetition rate of this method are discussed.