High Speed Sampling of Ultra-Fine Ambient Particles using Supersonic Flow

• Furuuchi Masami

  Graduate School of Natural Science & Technology, Kanazawa University, Japan

• Shimizu Yoshiyasu

  Graduate School of Natural Science & Technology, Kanazawa University, Japan

• Okubo Hirohisa

  Department of Civil Engineering, Kanazawa University, Japan

• Kanaoka Chikao

  Ishikawa National College of Technology, Japan

抄録

A super-sonic impactor using a Laval nozzle, which has been developed for size and concentration controls of ultra-fine aerosol particles down to nano-size range, was applied for the high speed sampling of ultra-fine ambient aerosol. The larger amount of ultra-fine ambient aerosol sampled in short period using the super-sonic impactor is expected to provide more detailed information of chemical components with the higher time resolution. Ambient aerosol (PM) were classified into two different size classes, or <100-200nm and above by the super-sonic impactor. Chemical components such as carbons(total carbon(TC)/elemental carbon(EC)/organic carbon(OC)), polycyclic aromatic hydrocarbons (PAHs), water solubles were analyzed. Concentration and chemical components of sampled particles were compared with those of total suspended particulates in order to evaluate wall loss and evaporation loss and artifacts due to the super-saturation of water vapor in the supersonic flow. Influence of air humidity, which may lead to the generation of water droplet, was also investigated using a diffusion dryer. Ambient particles were confirmed to be separated around 100-200nm using the supersonic impactor. When the humid air was sampled, concentration of particles collected on the backup filter downstream the supersonic impactor decreased probably because of the condensation of water vapor. There may be a possibility of an increase in collected amount of semi-volatile compounds to the backup filter due to the influence of super-saturation.

収録刊行物

• アジア・太平洋化学工学会議発表論文要旨集

  アジア・太平洋化学工学会議発表論文要旨集 2004 (0), 600-600, 2004

  公益社団法人 化学工学会

キーワード

• ultra-fine ambient particles
• supersonic flow
• sampling

詳細情報

• CRID: 1390282680704067712
• NII論文ID: 130005052664
• DOI: 10.11491/apcche.2004.0.600.0
• 本文言語コード: en
• データソース種別:
  • JaLC
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可