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Volume 10, No. 2, April 2010, Pages 185-192 PDF(408 KB)  
doi: 10.4209/aaqr.2009.11.0070   

Development and Performance Evaluation of Air Sampler with Inertial Filter for Nanoparticle Sampling

Masami Furuuchi1, Kazunobu Eryu1, Mizuki Nagura1, Mitsuhiko Hata1, Takaharu Kato2, Naoko Tajima2, Kazuhiko Sekiguchi3, Kensei Ehara4, Takafumi Seto1, Yoshio Otani1

1 Graduated School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa 9201192, Japan
2 Kanomax Japan Inc., Suita, Osaka 5650805, Japan
3 Graduate School of Science and Engineering, Saitama University, Saitama, Japan
4 NMIJ/AIST, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563, Japan




This paper describes the design and evaluation of an ambient air sampler consisting of a four-stage impactor and an inertial filter, for collecting various size fractions, including nano-particles, in a short sampling period. Impactor stages of PM10/PM2.5/PM1/PM0.5 were successfully devised with a reasonable accuracy in terms of cutoff size and slope of the collection efficiency curves. The designed inertial filter had an aerodynamic cutoff size of dp50 ~65 nm with a satisfactory sharpness in classification. The total pressure drop of the sampler (hereinafter referred to as a “Nanosampler”) was ~30 kPa at a flow rate of 40 L/min. The developed Nanosampler has advantages over currently available samplers such as LPI and nano-MOUDI, in terms of portability and loss of semi-volatile components in ultrafine particles by evaporation at a reduced pressure. Furthermore, the size distributions of the ambient particles measured with the Nanosampler compared favorably with those measured by the conventional instruments that are currently available on the market.



Keywords: Nano-particles; Inertial filter; Impactor; Pressure drop.



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