摘要
目的观察不同pH值下,亚氯酸钠(NaClO2)活化效果。方法用不同量浓度盐酸活化NaClO2后,用区分测定的方法测定活化不同时间(10min～24h)产生的二氧化氯(ClO2)。结果盐酸∶NaClO2的物质量的比为4∶1,活化10min时,NaClO2活化达到最高值(98.8%),此时pH值为0.47,盐酸与NaClO2的物质量的比为1∶1～4∶1时,ClO2活化率随pH值降低而升高;当pH值再降低,10min时ClO2的活化率反而有所下降。盐酸∶NaClO2的物质量的比分别为4∶1,5∶1,6∶1时,分别活化5、8、10min(活化10min的pH值分别为0.47、0.39、0.26),ClO2活化高峰约分别出现在10、8、5min。结论酸化NaClO2产生ClO2的活化率与pH值密切相关,当pH值<0.5时,ClO2活化率较高。
Objective To study the effect of different pH values on activation of sodium chlorite. Methods After activated sodium chlorite by different concentration of hydrochloric acid, differentiate determination was used to determine the concentration of chlorine dioxide and other chlorine species produced at different times. Results The activation rates of chlorine dioxide increased as concentration of hydrochloric acid gradually increased, that showed a dose-response manner. When concentration of hydrochloric acid were 9.6, 10 and 10.3 mol/L, the pH value reached 0.47, 0.39 and 0.26, respectively, the activation rate reached the peak value at 10 min （activation rate was 98.8%）, 8 min （97.1%） and 5 min （99.2%） respectively. Conclusion The activation rate of chlorine dioxide is related to pH. When pH value is less than 0.5, the activation rate of chlorine dioxide is higher. The lower the pH value is, the higher the activation rate of chlorine dioxide is and more early the peak value appears.
出处
《环境与健康杂志》
CAS
CSCD
北大核心
2006年第6期559-560,共2页
Journal of Environment and Health
关键词
水
消毒
二氧化氯
Water
Disinfection
Chlorine dioxide
