目的:测定二元包装配制的过氧乙酸原液的浓度、有效浓度变化、配制影响因素,对消毒现场进行指导工作。方法:采用碘量法对二元包装配制的过氧乙酸进行滴定。结果:二元配制的原液24小时浓度达到18.24%,随着时间的延长,含量降低明显。结论:过氧乙酸在应用中要做到现配现用,以免影响消毒效果。 OBJECTIVE: To determine the concentration of peroxyacetic acid stock solution prepared in binary packaging and the change of effective concentration, and to formulate the influencing factors to guide the disinfection field. Methods: Titration of peroxyacetic acid prepared by binary packaging was carried out by iodometry. Results: The concentration of binary solution was 18.24% in 24 hours, and the content decreased significantly with time. Conclusion: peracetic acid in the application should be made with the current use, so as not to affect the disinfection effect.