pH值对稳定型二氧化氯消毒剂活化影响的研究

STUDY ON THE INFLUENCE OF pH VALUE ON ACTIVATION OF STABLE CHLORINE DIOXIDE DISINFECTANT

稳定型二氧化氯消毒剂中的二氧化氯以亚氯酸盐的形式存在,经用盐酸活化释放出二氧化氯后才有杀菌作用。试验证明,活化与pH值有关,pH<0.5时。可快速释放活性二氧化氯,杀菌能力与纯二氧化氯溶液相似;pH>0.5时,二氧化氯释放速度减慢,活化不完全,杀菌能力较弱。

A stable chlorine dioxide disinfectant (drinking water disinfectant) was prepared in laboratory by dissolving gaseous chlorine dioxide in the solution of sodium percarbonate. The disinfectant contains 5% chlorine dioxide at pH 9.0±0.5 and gives a similar result to sodium chlorite in paper partition chromatography. The data presented here demonstrate that stable chlorine dioxide disinfectant has no germicidal capability if it is not activated by acidifying agents. Once it is activated, it could yield free chlorine dioxide and kill E. coli in water within one minute (2 mg/L). The concentration of free chlorine dioxide increased as the pH value decreased in the solution. Stable chlorine dioxide disinfectant has the best disinfecting capability when it is acidified to pH 0.5 or even lower.