Study on Disinfection Effect of Object Surface Based on 222 nm Excimer Lamp
In order to explore the killing effect of 222 nm excimolecular lamp on microorganisms under laboratory conditions,this study used the bacterial propagules of severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)as the indicator bacteria to investigate the disinfection effect of 222 nm excimer lamp on microorganisms under different conditions,and compared it with tradi-tional low-pressure mercury lamps.The results indicate that at a distance of 32 cm from the surface of the object,the peak wavelength of the excimer lamp is 222 nm,and the irradiance value is 1796 μw/cm2,while the peak wavelength of the low-pressure mercury lamp is 253.8 nm,and the irradiance value is only 484 μw/cm2.In terms of the killing effect on microorganisms,under the condition that the bacterial solution was diluted with phosphate buffer solution,with the temperature of the bacterial carrier steel plate at 20℃,and no drying conditions were applied,the killing logarithm of Staphylococcus aureuss,Escherichia coli,and Pseudomonas aeruginosa can reach 3 after 15 seconds of irradiation with a 222 nm excimer lamp.Under the condition that the bacterial solution was diluted with tryptone soy broth with the temperature of the bacterial carrier steel plate at 20℃,4℃and-20℃,and drying conditions were applied,it took 60 s for 222 nm excimer lamp to achieve disinfection effect,and 20 min for low-pressure mercury lamp.This study shows that under the same conditions,the time required for the 222nm excimer lamp to achieve disinfection effect is much shorter than that of the low-pressure mercury lamp,and the irradiance value and bactericidal effect of the 222 nm excimer lamp are stronger than those of the low-pressure mercury lamp.So the 222 nm excimer lamp can be applied to the surface disinfection of cold chain goods.
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