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A Cascade Air Sampler with Multi-nozzle Inertial Filters for PM0.1

Category: Aerosol Physics and Instrumentation

Volume: 19 | Issue: 8 | Pages: 1666-1677
DOI: 10.4209/aaqr.2019.02.0066
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Nuttapon Kumsanlas1, Suthida Piriyakarnsakul2, Pisith Sok1, Surapa Hongtieab2, Fumikazu Ikemori3, Wladyslaw Witold Szymanski4, Mitsuhiko Hata2, Yoshio Otani5, Masami Furuuchi 2,6

  • 1 Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1162, Japan
  • 2 Faculty of Geoscience and Civil Engineering, Institute of Science and Engineering, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
  • 3 Nagoya City Institute for Environmental Sciences, Minami-ku, Nagoya 457-0841, Japan
  • 4 Faculty of Physics, University of Vienna, 1090 Vienna, Austria
  • 5 Faculty of Frontier Engineering, Institute of Science and Engineering, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
  • 6 Faculty of Environmental Management, Prince of Songkla University, Hat Yat, Songkhla 90112, Thailand

Highlights

  • We developed a 3-nozzle inertial filter unit for the chemical analysis of PM0.1-0.5.
  • Separation performance of 1-and 3-nozzle IF units were consistent.
  • The PM and TC masses collected on IFs in the 1-and 3-nozzle units were equivalent.
  • The 3-nozzle unit had a slightly less pressure drop than the 1-nozzle unit.
  • The 3-nozzle unit resulted in a more uniform deposition of PM0.1 on the backup filter.

Abstract

We applied a 3-nozzle geometry to the inertial filter unit of a previously developed cascade air sampler, which originally consisted of a 4-stage (PM10/2.5/1/0.5) impactor, and an inertial filter unit embedded in a single circular nozzle (for PM0.1), and compared its performance against that of a single-nozzle inertial filter unit. The multi-nozzle design enabled the collection of multiple samples and the analysis of multi-chemical particle components in the size range of 0.1–0.5 µm. The total carbon was analyzed to determine the uniformity of the PM0.1 collected on a filter downstream from the inertial filter unit in both samplers, and the differences between the individual nozzles of the 3-nozzle unit as well as those between the 1- and 3-nozzle units were identified based on the chemical composition. After adjusting the quantity of the fibers in each inertial filter (one per nozzle) of the 3-nozzle sampler with care on the fiber packing uniformity , the 3-nozzle and 1-nozzle units exhibited similar separation performance, with approximately a 5% lower pressure drop for the former. The differences in the collected particle mass and the total carbon between the individual nozzles of the multi-nozzle unit and between the single- and multi-nozzle units were found to be less than 10%. However, the 3-nozzle unit uniformly collected particles regardless of the loaded particle mass, whereas its 1-nozzle counterpart exhibited non-uniform collection with higher loads. These data, together with the lower pressure drop, show that the multi-nozzle design has practical applicability, thus opening possibilities for chemically analyzing PM0.1.

Keywords

Nanoparticles Separation performance Multi-component analysis, Webbed metal fibers Uniform deposition


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