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A Sampler for Collecting Fine Particles into Liquid Suspensions

Category: Technical Note

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DOI: 10.4209/aaqr.2019.12.0616
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To cite this article:
Wang, D., Jiang, J., Deng, J., Li, Y. and Hao, J. (2020). A Sampler for Collecting Fine Particles into Liquid Suspensions. Aerosol Air Qual. Res., doi: 10.4209/aaqr.2019.12.0616.

Dongbin Wang 1,2, Jingkun Jiang1,2, Jianguo Deng1, Yuyang Li1, Jiming Hao1,2

  • 1 State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
  • 2 State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex, Beijing 100084, China

Highlights

  • A particle sampler is developed to collect fine particles into liquid suspension.
  • A novel high flow rate collection impactor is utilized.
  • Lab and field tests show a collection efficiency of over 85% for this sampler.

Abstract

In this study, we developed a Particle Sampler for Aerosol Suspension (PSAS) to collect ambient PM2.5 directly as liquid suspensions. The PSAS operates at 50 L/min and contains a custom-designed PM2.5 inlet for particle pre-selection, followed by a saturation-condensation unit for condensational growth that enlarges fine particles to 2~5 μm droplets. The grown droplets are sequentially collected in a newly designed collection impactor into liquid suspensions. Laboratory evaluations indicate good collection efficiencies of PSAS for both polydisperse and monodisperse fine particles, showing that 85% of particles are effectively preserved into collected suspensions. Field evaluations suggest good agreements for analyzed chemical components (water soluble Fe (II) and Cr (VI)) of ambient PM2.5 between suspensions collected by PSAS and parallel filters. The reported PSAS can be used for long-term particle collections and online chemical and toxicological analysis of ambient PM2.5.

Keywords

Aerosol sampler PM2.5 Suspension samples Condensational growth Droplet impactor


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