ABSTRACT The aim of this study was to apply a direct-reading aerosol instrument method and an elemental carbon (EC) analysis method to measure the mass-based penetration of single-walled carbon nanotubes (SWCNTs) and multi-walled carbon nanotubes (MWCNTs) through elastomeric half-mask respirators (EHRs) and filtering facepiece respirators (FFRs). For the direct-reading aerosol instrument method, two scanning mobility particle sizer/aerodynamic particle sizer systems were used to simultaneously determine the upstream (outside respirator) and downstream (inside respirator) test aerosols. For the EC analysis method, upstream and downstream CNTs were collected on filter cassettes and then analyzed using a thermal-optical technique. CNT mass penetrations were found in both methods to be within the associated efficiency requirements for each type and class of the respirator models that were tested. Generally, the penetrations of SWCNTs and MWCNTs had a similar trend with penetration being the highest for the N95 EHRs, followed by N95 FFRs, P100 EHRs, and P100 FFRs. This trend held true for both methods; however, the CNT penetration determined by the direct-reading aerosol instrument method (0.009–1.09% for SWCNTs and 0.005–0.21% for MWCNTs) was greater relative to the penetration values found through EC analysis method (0.007–0.69% for SWCNTs and 0.004–0.13% for MWCNTs). The results of this study illustrate considerations for how the methods can be used to evaluate penetration of morphologically complex materials through FFRs and EHRs.

中文翻译：

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应用直读和元素碳分析方法测量碳纳米管通过弹性半面罩和过滤面罩呼吸器的基于质量的渗透


摘要：本研究的目的是应用直读气溶胶仪器方法和元素碳（EC）分析方法来测量单壁碳纳米管（SWCNT）和多壁碳纳米管（MWCNT）的质量渗透率。通过弹性半面罩呼吸器（EHR）和过滤式面罩呼吸器（FFR）。对于直读气溶胶仪器方法，使用两个扫描迁移率粒度仪/空气动力粒度仪系统同时测定上游（呼吸器外部）和下游（呼吸器内部）测试气溶胶。对于 EC 分析方法，将上游和下游 CNT 收集在过滤盒上，然后使用热光技术进行分析。两种方法中的碳纳米管质量渗透率均符合所测试的每种类型和类别的呼吸器模型的相关效率要求。一般来说，单壁碳纳米管和多壁碳纳米管的渗透率具有相似的趋势，其中N95 EHR的渗透率最高，其次是N95 FFR、P100 EHR和P100 FFR。这两种方法都存在这种趋势。然而，通过直读气溶胶仪器方法测定的碳纳米管渗透率（单壁碳纳米管为0.009-1.09%，多壁碳纳米管为0.005-0.21%）相对于通过EC分析方法测得的渗透率值（单壁碳纳米管为0.007-0.69%，多壁碳纳米管为0.004）更大。 –0.13%（对于多壁碳纳米管）。本研究的结果说明了如何使用该方法通过 FFR 和 EHR 评估形态复杂材料的渗透性的考虑。