二氧化氯消毒剂有效成分区分测定方法的比较

Methods for Components in Chlorine Dioxide Disinfectant

目的为了科学地评价二氧化氯产品的质量和性能,引导二氧化氯产品的正确使用,有必要筛选出一套能准确区分测定活化后二氧化氯消毒液中 ClO_2、Cl_2、ClO_2^-、CLO_3^-浓度的方法。方法采用碘量法、丙二酸碘量法、改进丙二酸碘量法、五步碘量法对稳定性二氧化氯产品中的 ClO_2、Cl_2、ClO_2^-和 ClO_3^-的含量进行区分测定,评价比较了各种测定方法的优缺点和适用性。结果经碘量法测定.经盐酸活化的液体稳定性二氧化氯产品中 ClO_2含量为20.23 mg/ml,与产品的标示值基本一致;而经丙二酸碘量法进一步测得该液体稳定性二氧化氯产品中 ClO_2含量为19.99 mg/ml,Cl_2含量为0.35 mg/ml;而采用改进丙二酸碘量法和五步碘量法测得该液体稳定性二氧化氯产品中二氧化氯的活化率分别为88.0%,75.6%;可有效区分出二氧化氯消毒剂中的二氧化氯与亚氯酸根离子。结论采用改进丙二酸碘量法和五步碘量法可以区分测定出活化后的稳定性二氧化氯产品中的活性二氧化氯与残留的亚氯酸根含量,而碘量法和丙二酸碘量法则无法区分测定二氧化氟和亚氯酸根离子。

Objective In order to evaluate the quality and performance of chlorine dioxide disinfectant, it is necessary to develop a set of methods to determine the components in chlorine dioxide disinfectant. Methods Iodometry, malonic acid iodometry, improved malonic acid iodometry and five-step iodometry were employed to determine the components including ClO2, Cl2, ClO2^-, and ClO3^- in chlorine dioxide disinfectant, the advantages and disadvantages of the test methods were compared. Results Using iodometry, the liquid stabilized chlorine dioxide products activated by hydrochloric acid, the content of ClO2 was 20.23 mg/ml that was accord with the content which was marked in the product label. Using malonic acid iodometriy, the liquid stabilized chlorine dioxide contents of ClO2 was 19.99 mg/ml, Cl2 was 0.35 mg/ml, in which a little chlorine was detected. Using improved malonate iodometry and five-step iodometry, the activation rates of the liquid stabilized chlorine dioxide products were 88.0% and 75.6% respectively, CIO： and ClO2^- in the liquid stabilized chlorine dioxide products could be distinguished. Conclusion Active chlorine dioxide and residual ClO2^- can be detected by using iodometriy and improved malonie acid iodometry, but iodometriy and malonic acid iodometry can not.