Air sampling filtration media: Collection efficiency for respirable size-selective sampling.
Air sampling filtration media: Collection efficiency for respirable size-selective sampling.
复制标题
DOI：
10.1080/02786826.2015.1128525
复制
发表时间：
2016-01
期刊：
影响因子：
--
通讯作者：
Harper M
中科院分区：
文献类型：
--
作者：
Soo JC;Monaghan K;Lee T;Kashon M;Harper M
研究了常用的膜式空气采样过滤器在超细颗粒范围内的收集效率。混合纤维素酯（MCE; 0.45、0.8、1.2和5 μm孔径）、聚碳酸酯（0.4、0.8、2和5 μm孔径）、聚四氟乙烯（PTFE; 0.45、1、2和5 μm孔径）、聚氯乙烯（PVC; 0.8和5 μm孔径）和银膜（0.45、0.8、1.2和5 μm孔径）过滤器暴露于尺寸范围为10-400 nm的多分散氯化钠（NaCl）颗粒。将测试气溶胶雾化并通过扩散干燥器和气溶胶中和器引入平静的空气室中。将试验过滤器（直径37 mm）安装在金属试管内的导电聚丙烯过滤器支架（盒）中。实验在1.7和11.2 l min−1之间的流速下进行。通过扫描迁移率粒度分析仪（SMPS）测量供试过滤器上游和下游的NaCl挑战气溶胶的粒度分布。对每种类型的三种不同过滤器进行测试，每种孔径至少重复三次。一般而言，收集效率随气流、孔径和取样时间而变化。此外，收集效率和压降都随着孔径的减小和采样流速的增加而增加，但它们在过滤器类型和制造商之间存在差异。本研究证实，MCE、PTFE和PVC过滤器对远小于其标称孔径的挑战颗粒具有相对较高的收集效率，并且比聚碳酸酯和银膜过滤器的效率高得多，尤其是在较大的标称孔径下。
The collection efficiencies of commonly used membrane air sampling filters in the ultrafine particle size range were investigated. Mixed cellulose ester (MCE; 0.45, 0.8, 1.2, and 5 μm pore sizes), polycarbonate (0.4, 0.8, 2, and 5 μm pore sizes), polytetrafluoroethylene (PTFE; 0.45, 1, 2, and 5 μm pore sizes), polyvinyl chloride (PVC; 0.8 and 5 μm pore sizes), and silver membrane (0.45, 0.8, 1.2, and 5 μm pore sizes) filters were exposed to polydisperse sodium chloride (NaCl) particles in the size range of 10–400 nm. Test aerosols were nebulized and introduced into a calm air chamber through a diffusion dryer and aerosol neutralizer. The testing filters (37 mm diameter) were mounted in a conductive polypropylene filter-holder (cassette) within a metal testing tube. The experiments were conducted at flow rates between 1.7 and 11.2 l min−1. The particle size distributions of NaCl challenge aerosol were measured upstream and downstream of the test filters by a scanning mobility particle sizer (SMPS). Three different filters of each type with at least three repetitions for each pore size were tested. In general, the collection efficiency varied with airflow, pore size, and sampling duration. In addition, both collection efficiency and pressure drop increased with decreased pore size and increased sampling flow rate, but they differed among filter types and manufacturer. The present study confirmed that the MCE, PTFE, and PVC filters have a relatively high collection efficiency for challenge particles much smaller than their nominal pore size and are considerably more efficient than polycarbonate and silver membrane filters, especially at larger nominal pore sizes.