Development of a bench scale method for constant output of mineral dust
Development of a bench scale method for constant output of mineral dust
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DOI：
10.1080/02786826.2021.1888866
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发表时间：
2021-04
影响因子：
5.2
通讯作者：
Dhruv Mitroo;T. Gill;Savannah Haas;K. Pratt;C. Gaston
中科院分区：
文献类型：
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作者：
Dhruv Mitroo;T. Gill;Savannah Haas;K. Pratt;C. Gaston
摘要为了了解不同来源矿物粉尘对环境的影响，有必要开发气溶胶发生系统，该系统可以在受控的实验室设置下模拟沉积物气溶胶化成粉尘的过程。目前的实验室粉尘生成系统将受益于一个关键的机制，他们产生的灰尘超越单纯的再悬浮，包括自然风成过程，如跳跃/喷砂。如果没有真实生成的气溶胶，实验室测量的粉尘特性可能无法捕获与自然环境相关的特性。我们描述了一个台式系统的发展，恒定输出粉尘发生器（CODG），其设计考虑到占主导地位的自然物理过程的风蚀和矿物粉尘的生产。CODG的主要部件包括一个腕动式振荡器、定制烧瓶、稀释桶、旋风分离器和中和器。载气提供通过系统的流动，导致粉尘夹带。我们实现了恒定的输出，通常<10%的气溶胶表面积浓度的变化，为商业标准以及环境样品（盐结壳和松散沉积物）。我们发现，从CODG产生的气溶胶的组成是一致的母源材料的组成。我们进一步表明，我们的系统是适合于悬浮粉尘气溶胶的反应速率的测定。在类似的机械能输入下，它从松散的桑迪沉积物和粘性蒸发岩结壳中产生足够的物质（颗粒表面积浓度在10−5 − 10−3 cm 2 cm−3之间），可用于许多应用。CODG代表了一个系统，可能适用于许多应用程序的粉尘气溶胶研究。版权所有© 2021美国气溶胶研究协会
Abstract To realize the environmental impacts of mineral dust from different sources, it is necessary to develop aerosol generation systems that can mimic the processes of aerosolization of sediments into dusts under controlled laboratory settings. Current laboratory dust generation systems would benefit from a critical evaluation of the mechanisms by which they generate dust beyond mere resuspension to include natural eolian processes such as saltation/sandblasting. Without realistically generated aerosols, laboratory-measured dust properties may not capture properties relevant to the natural environment. We describe the development of a benchtop system, the Constant Output Dust Generator (CODG), whose design takes into account the dominant natural physical processes of wind erosion and mineral dust production. The CODG’s major components include a wrist-action shaker, custom-built flask, dilution drum, cyclone, and neutralizer. A carrier gas provides flow through the system resulting in dust entrainment. We achieved constant output, typically <10% variation in aerosol surface area concentration, for both a commercial standard as well as environmental samples (saline crusts and loose sediments). We find that the composition of aerosols generated from the CODG is consistent with the composition of the parent source material. We further show that our system is suitable for determination of reaction rates on suspended dust aerosols. At similar mechanical energy inputs, it generates sufficient material (particle surface area concentrations between 10−5 − 10−3 cm2 cm−3) for many applications from both loose sandy sediment and cohesive evaporite crusts. The CODG represents a system potentially applicable for numerous applications of dust aerosol research. Copyright © 2021 American Association for Aerosol Research