含氯消毒液氧化还原电位与杀菌效果关系的研究

目的研究一种含氯消毒粉水溶液氧化还原电位变化与其杀菌效果的关系。方法以悬液定量杀菌试验方法对该消毒液不同氧化还原电位条件下杀菌效果进行了观察。结果以含有效氯50 mg/L不变的条件下,该消毒液的氧化还原电位分别为700、800、900、980 mV,对悬液内大肠杆菌作用5 min,杀灭对数值分别为2.45、2.83、6.75和6.75;对金黄色葡萄球菌作用5 min,杀灭对数值分别为2.22、3.11、6.41和6.41。以含有效氯300 mg/L,氧化还原电位分别为900、980、1050 mV,对枯草杆菌黑色变种芽孢作用30 min,杀灭对数值分别为0.79、2.91和6.23。结论提高含氯消毒剂的氧化还原电位值,可明显提高其杀菌能力。

STUDY ON THE RELATION BETWEEN THE GERMICIDAL EFFICACY AND REDOX POTENTIAL OF DISINFECTANT SOLUTION CONTAINING CHLORINE

Objective To study the relation between the germicidal efficacy and the variation of the redox potential(ORP) of a disinfectant solution containing chlorine.Method Suspension quantitative germicidal test was used to observe the germicidal efficacy of the disinfectant solution at different ORP.Result When ORP of the disinfection solution containing a fixed concentration of available chlorine 50 mg/L was 700,800,900,980 mV,the killing logarithm values of Escherichia coli in suspension exposed to these disinfection solutions for 5 min were 2.45,2.83,6.75 and 6.75 respectively.The killing logarithm values of Staphylococcus aureus exposed to these disinfection solutions for 5 min were 2.22,3.11,6.41,6.41 respectively.The killing logarithm values of spores of Bacillus subtilis var.niger exposed to the disinfection solutions containing a fixed concentration of available chlorine 300 mg/L at the ORP 900,980 and 1050 mV for 30 min were 0.79,2.91 and 6.23 respectively.Conclusion When the ORP of a disinfectant solution containing chlorine was increased,its germicidal efficacy can be improved.