Development of a High-Volume PM2.5 Particle Sampler Using Impactor and Cyclone Techniques
Development of a High-Volume PM2.5 Particle Sampler Using Impactor and Cyclone Techniques
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DOI：
10.4209/aaqr.2014.09.0194
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发表时间：
2015-06-01
影响因子：
4
通讯作者：
Inoue, Kozo
中科院分区：
文献类型：
--
作者：
Okuda, Tomoaki;Isobe, Ryoma;Inoue, Kozo
由于很难收集到足够数量的PM2.5颗粒来进行细胞毒性分析，因此迄今为止，与PM2.5毒性相关的细胞生化反应的详细机制尚未得到很好的阐明。本研究开发了一种使用冲击器和旋风技术的大容量PM2.5颗粒采样器。在1100升/分钟的空气流量下，冲击器和旋风器对环境气溶胶的50%切割点分别为2.0 μ m和0.15-0.18 μ m。冲击器的分离特性与WINS冲击器相似。EC是粒径小于100 nm的初级颗粒的集合体，在旋风颗粒中的含量与过滤颗粒中的含量相似。与传统的过滤取样相比，旋风系统收集的颗粒中有机质和铵的含量较低。我们提出，本研究开发的大容量PM2.5颗粒采样器可以收集大量“粉末形式”的气溶胶颗粒，并且可以避免由于挥发性有机物和气态氨在过滤介质上吸附颗粒而产生的某些采样伪影。本研究中开发的采样装置使研究人员能够在不使用过滤器的情况下收集足够数量的PM2.5颗粒用于细胞暴露研究。
Detailed mechanisms of the cellular biochemical reactions associated with the toxicity of PM2.5 have not been elucidated well so far, because it is difficult to collect a sufficient amount of PM2.5 particles to carry out toxicity assays using cells. A high-volume PM2.5 particle sampler using the impactor and cyclone techniques has been developed in this study. The 50% cut-points of the impactor and cyclone for ambient aerosols at 1,100 L/min of air flow were 2.0 mu m and 0.15-0.18 mu m, respectively. The separation characteristics of the impactor were similar to those of the WINS impactor. The contents of EC, which is an aggregate/agglomerate of primary particles with sizes less than 100 nm, in the cyclone particles was similar to that in the filter particles. The contents of organic matter and ammonium in the particles collected using the cyclone system were lower than those in the particles collected using traditional filter sampling. We propose that the high-volume PM2.5 particle sampler developed in this study can collect a large amount of aerosol particles in a "powder form" and can also avoid certain sampling artifacts caused by the adsorption of volatile organic compounds and gaseous ammonia to particles on the filter media. The sampling device developed in this study allows researchers to collect a sufficient amount of PM2.5 particles for cell exposure studies without the use of filters.