Ren Jianlin, Tang Mengjia, Novoselac Atila
School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin, China.
Department of Civil, Architectural, and Environmental Engineering, University of Texas at Austin, USA.
Build Environ. 2022 Feb 1;209:108580. doi: 10.1016/j.buildenv.2021.108580. Epub 2021 Nov 26.
The rapid spread and high level of morbidity of the SARS-CoV-2 virus during the COVID-19 pandemic has attracted considerable attention worldwide. Recent studies have shown that clothing is one of the vectors for the transport of airborne particles, including bioaerosols. This study developed a method that can both quantify the deposition of particles onto clothing and the resuspension of particles from clothing using a fluorescent-tracking technology and found that electrical tape can be used as a fluorescent particle collector on irregular clothing surfaces. Results show that 0.07%-6.61% of the fluorescent particles (FPs) previously loaded on the room flooring surfaces moved to the occupant's clothing during the 20-min sampling periods; the percentage depended on the type of activity and the range is for: office work, walking, and vacuuming. Furthermore, both the flooring type (carpet or vinyl composition tile) and flooring condition (clean or dirty) had significant effects on particle resuspension and transport to the occupant's clothing. The average particle deposition factor for carpet flooring was 2.7 (±1.4) times that for vinyl composition tile flooring, while the average particle deposition factor for dirty flooring was 2.4 (±1.6) times that for clean flooring. A multiple regression analysis shows that the activity type had the largest effect on the particle transport among all experimental variables. An additional experiment performed in a full-scale house shows that 46.8% of FPs formerly seeded on clothing resuspended from clothing and dispersed around the house during the 1-h period of light walking at a speed of 60 steps/min.
在新冠疫情期间，严重急性呼吸综合征冠状病毒2（SARS-CoV-2）病毒的迅速传播和高发病率引起了全球的广泛关注。最近的研究表明，衣物是包括生物气溶胶在内的空气传播颗粒运输的载体之一。本研究开发了一种方法，该方法可以使用荧光追踪技术量化颗粒在衣物上的沉积以及颗粒从衣物上的再悬浮，并发现电工胶带可以用作不规则衣物表面的荧光颗粒收集器。结果表明，在20分钟的采样期间，先前加载在室内地板表面的荧光颗粒（FPs）中有0.07%-6.61%转移到了居住者的衣物上；该百分比取决于活动类型，范围适用于：办公室工作、行走和吸尘。此外，地板类型（地毯或乙烯基复合瓷砖）和地板状况（干净或脏污）对颗粒再悬浮和向居住者衣物的运输都有显著影响。地毯地板的平均颗粒沉积系数是乙烯基复合瓷砖地板的2.7（±1.4）倍，而脏污地板的平均颗粒沉积系数是干净地板的2.4（±1.6）倍。多元回归分析表明，在所有实验变量中，活动类型对颗粒运输的影响最大。在一个全尺寸房屋中进行的另一项实验表明，在以每分钟60步的速度进行1小时的轻度行走期间，先前附着在衣物上的46.8%的荧光颗粒从衣物上再悬浮并散布在房屋周围。
