Pittsburgh Mining Research Division, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Pittsburgh, Pennsylvania.
J Occup Environ Hyg. 2021 Mar;18(3):103-109. doi: 10.1080/15459624.2020.1868481. Epub 2021 Jan 21.
Field-based methods for the analysis of respirable crystalline silica are now possible with the availability of portable instrumentation. Such methods also require the use of cassettes that facilitate direct-on-filter analysis of field samples. Conventional sampling cassettes can be modified such that they are amenable to direct-on-filter analysis while remaining compatible with common respirable dust samplers. The required modifications are described herein, and one version of such an analysis-ready cassette is described and evaluated in comparison to more traditional cassette designs. The novel cassette was found to result in a slightly higher mass of collected respirable material (for the same sampling duration), though this is likely due to the conductive material of the cassettes, which prevents particle wall losses in comparison to the more commonly used styrene cassette material. Both types of cassettes demonstrated comparable predictability in terms of respirable crystalline silica in a sample.
现在，随着便携式仪器的出现，对可吸入结晶硅进行现场分析成为可能。此类方法还需要使用盒式采集器，以便直接在滤膜上分析现场样本。可对传统的采样盒进行修改，使其适用于直接在滤膜上进行分析，同时保持与常见的可吸入粉尘采样器兼容。本文介绍了所需的修改方法，并描述和评估了一种这种即用型分析盒与更传统的盒式设计相比。新型盒式采集器在相同的采样时间内收集到的可吸入物质的质量略高，但这可能是由于盒式采集器的导电材料导致的，与更常用的苯乙烯盒式采集器材料相比，它可防止颗粒壁损失。两种类型的盒式采集器在采集样本中的可吸入结晶硅方面都具有可预测性。
