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Evaluation of Multichannel Annular Denuders for a Newly Developed Ultrafine Particle Sampling System

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Volume: 9 | Issue: 1 | Pages: 50-64
DOI: 10.4209/aaqr.2008.11.0056
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K. Sekiguchi 1, K. H. Kim1, S. Kudo1, K. Sakamoto1, Y. Otani2, T. Seto2, M. Furuuchi2, F. Yoshikawa3, K. Ehara4, M. Hirasawa4, N. Tajima5, T. Kato5

  • 1 Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Sakura, Saitama 338-8570, Japan
  • 2 Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, 920-1192, Kanazawa, Japan
  • 3 Kanazawa Institute of Technology, 7-1 Ohgigaoka Nonoichi, 921-8501, Kanazawa, Japan
  • 4 National Institute of Advanced Industrial Science and Technology, Tsukuba Central 2, 305-8568, Tsukuba, Japan
  • 5 Japanese Kanomax Inc., 2-1 Shimizu Suita, Osaka 565-0805, Japan


Laboratory studies evaluated the gas collection efficiencies and particle transmission efficiencies of 1-, 3-, 5-, and 8-channel denuders under simulated atmospheric conditions with the goal of combining an annular denuder–filter pack (AD-FP) system with a newly developed inertial classification. The multichannel denuders having large surface areas were considered for this AD-FP system since the inertial classification system operates at a flow rate of 40 L/min. Gas collection efficiency was measured with phosphorous acid–coated denuders targeted on ammonia gas. Particle transmission efficiency was measured for ammonium sulfate particles. The denuder-coating procedure and the method for extracting the multichannel denuders are described in detail. Gas collection efficiencies for the 1-, 3-, 5-, and 8-channel denuders were 96.3, 98.6, 98.2, and 98.3% (1-ch < 5-ch, 8-ch, and 3-ch), respectively. The extraction efficiency was greater than 96% for all but the 8-channel denuder (92%). The particle transmission efficiencies for the 1-, 3-, 5-, and 8-channel denuders at 40 L/min were 97.3, 97.4, 94.7, and 93.4% (8-ch < 5-ch < 1-ch and 3-ch), respectively. These results indicate that a 1- or 3-channel denuder can be effectively used in this AD-FP system at a flow rate of 40 L/min.


Multichannel annular denuder Gas collection efficiency Particle loss Extraction efficiency

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