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一种高效评估液体吸收气溶胶采样器对不同粒径气溶胶采样效率的实验方法。

An experimental method for efficiently evaluating the size-resolved sampling efficiency of liquid-absorption aerosol samplers.

机构信息

State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing, 100071, China.

Laboratory Animal Center, Academy of Military Medical Science, Beijing, China.

出版信息

Sci Rep. 2022 Mar 18;12(1):4745. doi: 10.1038/s41598-022-08718-8.

DOI:10.1038/s41598-022-08718-8
PMID:35304534
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8932469/
Abstract

Aerosol samplers are critical tools for studying indoor and outdoor aerosols. Development and evaluation of samplers is often labor-intensive and time-consuming due to the need to use monodisperse aerosols spanning a range of sizes. This study develops a rapid experimental methodology using polydisperse solid aerosols to evaluate size-resolved aerosol-to-aerosol (AtoA) and aerosol-to-hydrosol (AtoH) sampling efficiencies. Arizona Test Dust (diameter 0.5-20 µm) was generated and dispersed into an aerosol test chamber and two candidate samplers were tested. For the AtoA test, aerosols upstream and downstream of a sampler were measured using an online aerodynamic particle sizer. For the AtoH test, aerosols collected in sampling medium were mixed with a reference sample and then measured by the laser diffraction method. The experimental methodology were validated as an impressive time-saving procedure, with reasonable spatial uniformity and time stability of aerosols in the test chamber and an acceptable accuracy of absolute mass quantification of collected particles. Evaluation results showed that the AGI-30 and the BioSampler sampler had similar size-resolved sampling efficiencies and that efficiencies decreased with decreasing sampling flow rate. The combined evaluation of AtoA and AtoH efficiency provided more comprehensive performance indicators than either test alone. The experimental methodology presented here can facilitate the design and choice of aerosol sampler.

摘要

气溶胶采样器是研究室内和室外气溶胶的重要工具。由于需要使用跨越大尺寸范围的单分散气溶胶，因此采样器的开发和评估通常是劳动密集型和耗时的。本研究开发了一种使用多分散固体气溶胶的快速实验方法，以评估尺寸分辨的气溶胶对气溶胶（AtoA）和气溶胶对水溶胶（AtoH）的采样效率。生成了亚利桑那州测试粉尘（直径 0.5-20 µm）并将其分散到气溶胶测试室中，并测试了两个候选采样器。对于 AtoA 测试，使用在线空气动力学粒径仪测量采样器上下游的气溶胶。对于 AtoH 测试，将采样介质中收集的气溶胶与参考样品混合，然后通过激光衍射法进行测量。实验方法被验证为一种节省时间的程序，测试室内气溶胶具有合理的空间均匀性和时间稳定性，以及收集颗粒的绝对质量定量的可接受准确性。评估结果表明，AGI-30 和 BioSampler 采样器具有相似的尺寸分辨采样效率，并且效率随采样流速的降低而降低。AtoA 和 AtoH 效率的综合评估比单独进行任何一项测试提供了更全面的性能指标。这里提出的实验方法可以促进气溶胶采样器的设计和选择。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/866a/8933427/5fe29d7212d3/41598_2022_8718_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/866a/8933427/ab7cce83ddab/41598_2022_8718_Fig1_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/866a/8933427/5fe29d7212d3/41598_2022_8718_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/866a/8933427/ab7cce83ddab/41598_2022_8718_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/866a/8933427/4f6699ab36be/41598_2022_8718_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/866a/8933427/ed52dae73250/41598_2022_8718_Fig3_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/866a/8933427/9f204e82a974/41598_2022_8718_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/866a/8933427/5affa1c430ee/41598_2022_8718_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/866a/8933427/5fe29d7212d3/41598_2022_8718_Fig7_HTML.jpg

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