【摘要】 2002年版《消毒技术规范》中关于用“五步碘量法”测定二氧化氯含量存在一定技术缺陷,针对这一问题,我们用修正方法对测定样品的pH值、氮气吹脱条件、反应温度和时间控制等进行了实验室测定比较。结果,对同一份盐酸活化的样品分别用规范的五步碘量法、修正方法和直接分光光度法测得的二氧化氯含量分别是2572、3409和3450mg/L;对同一份柠檬酸活化的样品测得的二氧化氯含量分别是4679、13696和14190mg/L。结果说明,修正方法与直接分光光度法测定结果基本一致,而规范五步碘量法测定结果偏低。结论,规范的五步碘量法需要改进,本修正方法与分光光度法测定结果一致。更多还原

【Abstract】 The measurement of chlorine dioxide by 5-step iodometry specified in "Technical Standard for Disinfection", 2002ed, has certain technical defects. In order to solve this problem, the methods of revision of pH value of the sample for measuring, condition for denitrogeneration by blowing, reaction temperature and time control were suggested and comparative measurement was carried out in laboratory. Results: Chlorine dioxide content in a same hydrochloric acid activated sample measured by 5-step iodometry described in "Technical Standard for Disinfection", revised method and direct spectrophotometry was 2572, 3409 and 3450 mg/L respectively, and the chlorine dioxide content in a same citric acid activated sample measured by these three methods was 4679, 13696 and 14190 mg/L respectively. The results showed that the results of measuring with the revised method and direct spectrophotometry were essentially identical, while the content measured by the five-step iodometry tended to be low. Conclusions: The "five-step iodometry" specified in "Technical Standard for Disinfection" needs to be revised and the results obtained with the revised method and spectrophotometric method were identical.更多还原