技术说明:优化用于空气中金属超细粒子采样的级联冲击器收集基质的制备方法

IF 3.9 3区 环境科学与生态学 Q2 ENGINEERING, CHEMICAL Journal of Aerosol Science Pub Date : 2024-06-08 DOI:10.1016/j.jaerosci.2024.106408
Naïma Gaudel, Sébastien Bau, Virginie Matera
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引用次数: 0

摘要

由于空气中的金属超细粒子(UFP)对健康的影响,以及焊接、氧切割或 3D 打印等许多活动可能涉及的超细粒子,对工人暴露于空气中的超细粒子的特征描述已成为一个日益重要的问题。确定此类气溶胶的粒度分布有助于真正了解超细粒子的暴露和相关健康影响,因为这直接关系到它们在呼吸道中的穿透力。在这种情况下,建议优化空气中金属 UFP 级联冲击器收集基质的制备。实验结果证实,必须事先在收集基板上涂抹一层耐高真空的硅脂。实验结果表明,这种硅脂必须预先溶解在庚烷溶液中,硅脂与溶剂的质量比为 7.5%,然后沉积在基底上,目标高度为 9 μm。采用这种方案可确保粒度分布测定的可重复性和代表性,从而大大减少颗粒反弹和再裹挟现象。实验还表明,涂层收集基底的质量可保持稳定数月之久,而且由于涂层膜上颗粒的内聚力提高,收集的样品在运输过程中也能保持稳定。
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Technical note: Optimization of the preparation of cascade impactors collection substrates for airborne metallic ultrafine particle sampling

The characterization of workers’ exposure to airborne metallic ultrafine particles (UFP) has been an increasing issue because of their effects on health, and as many activities are potentially concerned such as welding, oxy-cutting or 3D printing. Determining the particle size distribution of such an aerosol provides a real contribution to the understanding of UFP exposures and associated health effects, as it is directly related to their penetration in the respiratory tract. In this context, it is proposed to optimize the preparation of collection substrates of cascade impactors of airborne metallic UFP. The experimental results confirm that the collection substrates have to be prepared beforehand by coating them with a high-vacuum-resistant silicone grease. The results highlight that this grease has to be preliminarily dissolved in a heptane-based solution with a mass ratio grease-solvent of 7.5%, and then deposited on the substrate with a target height of 9 μm. Applying this protocol ensures a reproducible and representative determination of the particle size distribution, allowing the phenomena of particle bouncing and reentrainment to be significantly reduced. It is also shown that coated collection substrates remain stable for several months in terms of mass, and that the samples collected remain stable during transport thanks to the improvement of particle cohesion on the coated membrane.

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来源期刊
Journal of Aerosol Science
Journal of Aerosol Science 环境科学-工程:化工
CiteScore
8.80
自引率
8.90%
发文量
127
审稿时长
35 days
期刊介绍: Founded in 1970, the Journal of Aerosol Science considers itself the prime vehicle for the publication of original work as well as reviews related to fundamental and applied aerosol research, as well as aerosol instrumentation. Its content is directed at scientists working in engineering disciplines, as well as physics, chemistry, and environmental sciences. The editors welcome submissions of papers describing recent experimental, numerical, and theoretical research related to the following topics: 1. Fundamental Aerosol Science. 2. Applied Aerosol Science. 3. Instrumentation & Measurement Methods.
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