Filtration Performance Degradation of In-Use Masks by Vapors from Alcohol-Based Hand Sanitizers and the Mitigation Solutions,Global Challenges

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Filtration Performance Degradation of In-Use Masks by Vapors from Alcohol-Based Hand Sanitizers and the Mitigation Solutions
Global Challenges ( IF 4.4 ) Pub Date : 2021-06-27 , DOI: 10.1002/gch2.202100015
Weidong He _{1,

2,

3} , Yinghe Guo _{1,

2,

3} , Jingxian Liu ₁ , Yang Yue _{2,

3} , Jing Wang _{2,

3}

Affiliation

In the current COVID-19 pandemic, wearing masks and hand disinfection are widely adopted hygiene practices. Alcohol-based sanitizers are commonly used for hand disinfection, however, the alcohol vapors can dissipate the charges on electrostatic filters. In the present study, the effects of alcohol vapors from alcohol-based sanitizers during hand disinfection on the in-use masks are studied. The results show that the negative effects are not significant for nonelectrostatic cotton masks or N95 respirators with multiple charged layers, but noticeable for surgical masks. After five rounds of hand disinfection, the filtration efficiencies of the filtering materials of the surgical masks decrease by more than 8% for 400 and 500 nm particles and by 3.7 ± 1.8% for 1 µm particles, the effective filtration efficiency of the surgical masks worn by the volunteers (with leakage considered) decreases by about 5% for ambient aerosol. In another process to imitate intensive disinfection procedures by healthcare workers, a 30 min surface cleaning process using alcohol-based sanitizer is performed, and the effective efficiency of the N95 respirators worn by the volunteers decreases by nearly 9%. The simple practice of avoiding vapor during hand disinfection could mitigate the effects of alcohol vapor, which is demonstrated on two brands of surgical masks.

中文翻译：

酒精类洗手液蒸汽导致使用中口罩过滤性能下降及缓解方案

在当前的COVID-19大流行中，戴口罩和手部消毒是广泛采用的卫生习惯。酒精类消毒剂通常用于手部消毒，但是酒精蒸气会消散静电过滤器上的电荷。在本研究中，研究了手部消毒过程中酒精消毒剂中的酒精蒸气对使用中的口罩的影响。结果表明，对于非静电棉质口罩或具有多个带电层的 N95 口罩来说，负面影响并不显着，但对于外科口罩来说，负面影响却很明显。经过五轮手部消毒后，外科口罩过滤材料对400、500 nm颗粒物的过滤效率下降8%以上，对1 µm颗粒物的过滤效率下降3.7±1.8%，所佩戴外科口罩的有效过滤效率志愿者（考虑泄漏）使环境气溶胶减少约 5%。在另一个模仿医护人员密集消毒程序的过程中，使用酒精消毒剂进行30分钟的表面清洁过程，志愿者佩戴的N95口罩的有效效率下降了近9%。在手部消毒过程中避免蒸汽的简单做法可以减轻酒精蒸汽的影响，这在两个品牌的外科口罩上得到了证明。

更新日期：2021-09-03

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