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A combination of size-resolved particle samplers and XRF microprobe technique for single particle study

机译:尺寸解析粒子采样器和XRF微探针技术相结合的单粒子研究

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摘要

It is important to understand the properties of individual airborne particulates that are determined by the processes of various physicochemical reactions occurring in their generation, transformation, and transport. This study describes the application of the X-ray fluorescence (XRF) microprobe technique to the analysis of size-resolved individual particles as well as the results of an experimental study on the comparison of three different particle collection instruments for single particle analysis: a two-stage filter pack, a low pressure Andersen impactor (LPAI), and a micro-orifice uniform deposit impactor (MOUDI). Though LPAI and MOUDI are relatively suitable for multisize-segregated particles sampling compared with the two-stage filter pack sampler, they can easily form particle clusters and finally these particle clusters impede single particle analysis. Even though more particle mass can be collected without overloading on the substrate using MOUDI, by stage rotating, particles are still deposited and form clusters on the concentric circles. When particles are forming a spot (or other shapes of particle cluster), single particle analysis using the XRF micro-beam technique is restricted to individual particles deposited at the edge of the spot. Thus, the sampling duration time depending on the sampler stage should be adjusted for single particle study.
机译:重要的是要了解单个空气中悬浮微粒的特性,这些微粒是由其生成,转化和运输过程中发生的各种物理化学反应的过程所决定的。这项研究描述了X射线荧光(XRF)微探针技术在尺寸分辨单个颗粒分析中的应用,以及对三种不同颗粒收集工具进行单颗粒分析的比较实验研究的结果:两个级过滤器,低压安徒生撞击器(LPAI)和微孔均匀沉积撞击器(MOUDI)。尽管与两级过滤包采样器相比,LPAI和MOUDI相对适合于多尺寸分离的颗粒采样,但它们很容易形成颗粒簇,最终这些颗粒簇阻碍了单颗粒分析。即使使用MOUDI可以收集更多的颗粒质量而不会在基板上造成过载,但通过阶段旋转,颗粒仍会沉积并在同心圆上形成簇。当颗粒形成斑点(或其他形状的颗粒簇)时,使用XRF微束技术进行的单个颗粒分析仅限于沉积在斑点边缘的单个颗粒。因此,对于单颗粒研究,应调整取决于采样阶段的采样持续时间。

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