Filter quality of electret masks in filtering 14.6-594 nm aerosol particles: Effects of five decontamination methods.
Filter quality of electret masks in filtering 14.6-594 nm aerosol particles: Effects of five decontamination methods.
复制标题
DOI：
10.1371/journal.pone.0186217
复制
发表时间：
2017
期刊：
影响因子：
3.7
通讯作者：
Lin WY
中科院分区：
文献类型：
--
作者：
Lin TH;Chen CC;Huang SH;Kuo CW;Lai CY;Lin WY
本研究探讨了五种去污方法对三种市售驻极体口罩-N95、纱布和水刺无纺布口罩过滤质量的影响。新开发的评价方法，整体过滤质量（qf，o）和qf比，用于评价净化器的净化方法的有效性。利用扫描迁移率粒度仪测量直径为14.6-594 nm的多分散颗粒的浓度。利用粒子的穿透率和通过面罩的压降（Δp）来确定qf和qf，o。实验结果表明，N95、纱布和水刺口罩的最大穿透粒径（MPS）分别为118 nm、461 nm和279 nm，穿透率分别为2.6%、23.2%和70.0%。在重型工作人员的呼吸流速下，通过预处理的N95面罩的Δp为9.2 mm H2O，超过通过纱布和水刺面罩获得的Δp值。去污增加了最具穿透力的颗粒的尺寸，改变了所有口罩的qf值：qf随着颗粒尺寸的增加而下降，因为穿透力增加了。漂白剂增加了N95的Δp，但破坏了纱布面罩。然而，高压灭菌器的使用降低了N95和纱布面罩的Δp值。电饭煲和乙醇都没有改变纱布面罩的Δp。化学去污方法降低了三种驻极体口罩的qf，o值。PM0.1的qf，o值超过PM0.1-0.6的qf，o值，因为小于100 nm的颗粒具有较低的穿透性，导致对于给定的压降具有更好的qf。qf，o的值，特别是对于PM0.1，表明对于测试的处理和口罩，物理去污方法对过滤器的破坏性小于化学方法。然而，在购买新的或重复使用的FFR时，应优先考虑穿透性。
This study investigates the effects of five decontamination methods on the filter quality (qf) of three commercially available electret masks—N95, Gauze and Spunlace nonwoven masks. Newly developed evaluation methods, the overall filter quality (qf,o) and the qf ratio were applied to evaluate the effectiveness of decontamination methods for respirators. A scanning mobility particle sizer is utilized to measure the concentration of polydispersed particles with diameter 14.6–594 nm. The penetration of particles and pressure drop (Δp) through the mask are used to determine qf and qf,o. Experimental results reveal that the most penetrating particle size (MPS) for the pre-decontaminated N95, Gauze and Spunlace masks were 118 nm, 461 nm and 279 nm, respectively, and the respective penetration rates were 2.6%, 23.2% and 70.0%. The Δp through the pretreated N95 masks was 9.2 mm H2O at the breathing flow rate of heavy-duty workers, exceeding the Δp values obtained through Gauze and Spunlace masks. Decontamination increased the sizes of the most penetrating particles, changing the qf values of all of the masks: qf fell as particle size increased because the penetration increased. Bleach increased the Δp of N95, but destroyed the Gauze mask. However, the use of an autoclave reduces the Δp values of both the N95 and the Gauze mask. Neither the rice cooker nor ethanol altered the Δp of the Gauze mask. Chemical decontamination methods reduced the qf,o values for the three electret masks. The value of qf,o for PM0.1 exceeded that for PM0.1–0.6, because particles smaller than 100 nm had lower penetration, resulting in a better qf for a given pressure drop. The values of qf,o, particularly for PM0.1, reveal that for the tested treatments and masks, physical decontamination methods are less destructive to the filter than chemical methods. Nevertheless, when purchasing new or reusing FFRs, penetration should be regarded as the priority.
登录
查看更多内容
影响因子：
5.2
作者：
Wang, Jing;Kim, Seong Chan;Pui, David Y. H.
通讯作者：
Pui, David Y. H.
影响因子：
5.2
作者：
Fonseca, A. S.;Viana, M.;Asbach, C.
通讯作者：
Asbach, C.
影响因子：
4.5
作者：
Wang, Jing;Kim, Seong Chan;Pui, David Y. H.
通讯作者：
Pui, David Y. H.
影响因子：
3.7
作者：
Roberge RJ;Kim JH;Powell JB;Shaffer RE;Ylitalo CM;Sebastian JM
通讯作者：
Sebastian JM
影响因子：
11.8
作者：
Chen YC;Chen PJ;Chang SC;Kao CL;Wang SH;Wang LH;Yang PC;SARS Research Group of National Taiwan University College of Medicine and National Taiwan University Hospital
通讯作者：
SARS Research Group of National Taiwan University College of Medicine and National Taiwan University Hospital