Abstract:

Abstract: Objective Study the disinfectant efficacy of microacid hypochloric acid solution on bacteria, and evaluate its disinfection effect on the dynamic environment of barrier facilities in order to obtain the disinfection strategy for dynamic environment. Method Detection of active chlorine content and pH value in microacidic hypochloric acid liquid, Staphylococcus aureus and Salmonella were used to prepare the suspension of bacteria respectively, and directly contacted with microacid hypochloric acid for certain time, then the inhibition bactericidal rate was calculated solution. This microacid hypochloric acid solution was further sprayed on the barrier facility, and the number of bacteria was measured, the germicidal rate was calculated at different time. Result The available chlorine content and pH value of slightly acidic hypochlorite solution are 6. 84 × 10- 2 g / L and 6. 24 respectively. After treatment with microacid bactericidal solution for 15 minutes inhibition bactericidal rate could reach more than 90% for those two standard strains. When microacid solution was sprayed for 15 minutes in barrier
facilities, the disinfection rate was maintained at 90% within 2 hours; 48 - 72 hours later the disinfection rate reduced less than 30%. If sprayed for 1 hour once a day,worked for 5 minutes and rest for 5 minutes and kept for 21 days the disinfection rate reached 60%; If sprayed for 30 minutes twice a day one time and kept for 21 days the disinfection rate reached more 90%. Conclusion Micro-acid hypochloric acid solutionn show perfect sterilize effect on barrier facilities, and the disinfectant rate reach more than 90% for long time use. It may be an efficient and safe microbial control strategy.