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Collection characteristics of low-pressure impactors with various impaction substrate materials

机译：各种冲击基材对低压冲击器的收集特性

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摘要

The effects of types of low-pressure impactors (DLPI; Dekati; referred to hereinafter as "LPI"; and NanoMOUDI-II; MSP) and impaction substrate materials (aluminum foils, quartz fiber filters, and polycarbonate filters) on mass size distribution were studied for diesel exhaust particles from dynamometer test (DEP) and roadside atmospheric particles for a better understanding in terms of chemical analysis of impactor sample. Particle mass size distribution measured with LPI using aluminum foils and polycarbonate filters was distorted toward smaller mode diameters than those measured with NanoMOUDI using aluminum foils in sampling DEP and roadside atmospheric particles. This difference is explained by the occurrence of particle blow off in LPI. Heavy loading due to high concentrations in a specific size range results in greater particle loading height, from which particles are easily blown off by high jet velocities. Mass size distribution of DEP measured with LPI using a quartz fiber filter was modified to larger mode diameter than that measured with NanoMOUDI using aluminum foils. Higher particle collection efficiency than the ideal condition and smaller particles than the calibrated size, collected on upper stages, resulted in larger mode diameter, owing to the occurrence of filtration as well as impaction, and a shorter jet-to-plate distance, owing to the thickness of the filter. On the other hand, mass size distribution of roadside atmospheric particles measured with LPI using quartz fiber filters was similar to that measured with NanoMOUDI using aluminum foils. It is possible that the artifact of filtration is not important because of lower particle concentrations in the roadside atmosphere than in DEP. This experimental study of mass size distributions with various impactor types and substrate materials will enhance our understanding of the size distribution of chemical components, because impaction substrate material is restricted from methods of chemical analysis even though each substrate material has different collection characteristics. (c) 2006 Elsevier Ltd. All rights reserved.
机译：低压冲击器（DLPI； Dekati；在下文中称为“ LPI”； NanoMOUDI-II； MSP）和冲击基底材料（铝箔，石英纤维过滤器和聚碳酸酯过滤器）的类型对质量尺寸分布的影响为研究了测功机测试（DEP）中的柴油机排气颗粒和路边的大气颗粒，以更好地了解撞击器样品的化学分析。在采样DEP和路边大气颗粒时，使用铝箔和聚碳酸酯过滤器的LPI测量的颗粒质量分布向着比使用铝箔使用NanoMOUDI测量的模式直径更小的模直径。这种差异可以通过LPI中发生吹出颗粒来解释。由于在特定尺寸范围内的高浓度而造成的重载会导致更大的颗粒装载高度，高喷射速度会很容易地将颗粒吹走。使用LPI使用石英纤维过滤器测量的DEP的质量尺寸分布被修改为比使用NanoMOUDI使用铝箔测量的更大的模式直径。在较高级收集的比理想条件高的颗粒收集效率，比标称尺寸小的颗粒，由于过滤和撞击的发生，导致了更大的模式直径，这是由于过滤和撞击的缘故，以及更短的喷射到板的距离，这是由于过滤器的厚度。另一方面，使用石英纤维过滤器的LPI测量的路边大气颗粒的质量尺寸分布与使用铝箔的NanoMOUDI测量的相似。过滤的伪影可能并不重要，因为路边大气中的颗粒浓度低于DEP。这项对各种撞击器类型和基材的质量尺寸分布的实验研究将增强我们对化学成分尺寸分布的理解，因为即使每种基材具有不同的收集特性，撞击基材也受到化学分析方法的限制。 （c）2006 Elsevier Ltd.保留所有权利。

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