ABSTRACT Conventional methods to measure the metallic content of particles by size are time consuming and expensive, requiring collection of particles with a cascade impactor and subsequent metals analysis by inductively coupled plasma mass spectrometry (ICP-MS). In this work, we describe a rapid way to measure the size distribution of metal-containing particles from 10 nm to 20 µm, using a nano micro-orifice uniform-deposit impactor (nano-MOUDI) to size-selectively collect particles that are then analyzed with a field portable X-ray fluorescence (FP-XRF) device to determine metal composition and concentration. The nano-MOUDI was used to sample a stainless-steel aerosol produced by a spark discharge system. The particle-laden substrates were then analyzed directly with FP-XRF and then with ICP-MS. Results from FP-XRF were linearly correlated with results from ICP-MS (R2 = 0.91 for Fe and R2 = 0.84 for Cr). Although the FP-XRF was unable to effectively detect Fe particles at mass per substrate loadings less than 2.5 µg effectively, it produced results similar to those from ICP-MS at a mass per substrate loadings greater than 2.5 µg. Copyright © 2017 American Association for Aerosol Research

中文翻译：

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快速分析含金属气溶胶的粒径分布


摘要：按尺寸测量颗粒金属含量的传统方法既耗时又昂贵，需要使用级联冲击器收集颗粒，然后通过电感耦合等离子体质谱 (ICP-MS) 进行金属分析。在这项工作中，我们描述了一种快速测量 10 nm 至 20 µm 含金属颗粒尺寸分布的方法，使用纳米微孔均匀沉积冲击器 (nano-MOUDI) 有选择地收集颗粒，然后使用现场便携式 X 射线荧光 (FP-XRF) 设备进行分析，以确定金属成分和浓度。纳米 MOUDI 用于对火花放电系统产生的不锈钢气溶胶进行采样。然后直接使用 FP-XRF 和 ICP-MS 分析载有颗粒的基材。 FP-XRF 的结果与 ICP-MS 的结果呈线性相关（Fe 的 R2 = 0.91，Cr 的 R2 = 0.84）。尽管 FP-XRF 无法有效检测每基质负载质量小于 2.5 µg 的铁颗粒，但它在每基质负载质量大于 2.5 µg 时产生与 ICP-MS 类似的结果。版权所有 © 2017 美国气溶胶研究协会