Abstract：Objective To understand the disinfection performance of a compound quaternary ammonium salt disinfectant (quaternary ammonium salt mixed with plant cold extract), and to provide a scientific basis for disinfection of air andobjectsurface. Methods Physical and chemical tests, laboratory tests, toxicity tests and field disinfection tests were used to observe the stability, corrosiveness and disinfection effect of the compound quaternary ammonium salt disinfectant. Results The content of quaternary ammonium salt (calculated by benzalkonium bromide) in the disinfectant stock solution was 0.25%, with stable performance and basically no corrosion to stainless steel and copper. The logarithmic value of killing natural bacteria on the wood surface after 10 minutes of action of the stock solution was all greater than 1.00, and the killing effects on Staphylococcus aureus ATCC6538, Escherichia coli 8099, Candida albicans ATCC10231 and Pseudomonas aeruginosa ATCC15442 after 5 minutes of action were all in line with the general requirements of GB27952-2020 for common surface disinfectants. After exposure for 30 minutes, the killing rate of artificially contaminated Staphylococcus albus 8,032 was greater than 99.90%, and the extinction rate of natural bacteria in the air was greater than 90.00%, which met the general requirements of GB 27948-2020 air disinfectant. Conclusion The disinfectant has a good killing effect on bacterial propagules, Candida albicans and Staphylococcus albicans, with stable performance and low corrosiveness to metals, and can be used for object surface disinfection and air disinfection.
2023, Vol. 30 
