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Factors affecting the performance of bioaerosol impactors.

Grinshpun-SA; Adhikari-A; Cho-SH; Reponen-T; Mainelis-G; Yao-M
European Aerosol Conference 2007, September 9-14, 2007, Salzburg, Austria. Karlsruhe, Germany: Gesellschat fur Aerosolforschung (GAeF) and Universitat Salzburg, 2007 Sep; :T04A004
While different principles are utilized for sampling biological aerosol particles, impaction appears to be the most common for collecting bacteria and fungi. This method is used for total and culture-based microbial enumeration. For instance, the total number of viable and non-viable airborne spores is conventionally counted under a microscope after collecting them on a slide of a single-stage impactor, e.g., Air-O-Cell sampling cassette (Zefon Analytical Instruments, Inc., USA), the Burkard Personal Volumetric Air Sampler (Burkard Manufacturing Co. Ltd., U.K.) and Allergenco-D (Environmental Monitoring Systems, Inc., USA) to mention a few. Available bioaerosol impactors are usually equipped with either circular or rectangular (slit) inlets. Some impactors have a single nozzle as an inlet, e.g., Air-O-Cell, while others have hundreds of nozzles, e.g., Millipore Air Tester (Millipore Corp., USA). More importantly, they differ from one another with respect to their ability to efficiently collect bio-particles of specific sizes as well as by the particle deposit uniformity on a substrate (the latter is often critical for applying certain microbial enumeration protocols). The collection efficiency is characterized by the cut-off size, d50 that depends on the flow velocity through the nozzle, nozzle size (W), nozzle shape, non-dimensional jet-to-plate distance (S/W), and other factors.
Sampling; Sampling-equipment; Sampling-methods; Air-monitoring; Air-quality-monitoring; Air-sampling; Air-sampling-equipment; Air-sampling-techniques; Author Keywords: Bioaerosols; Collection Efficiency; Inertial Impactor; Cut-off Diameter; Particle Deposition
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European Aerosol Conference 2007, September 9-14, 2007, Salzburg, Austria
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Rutgers, The State University of New Jersey, New Brunswick
Page last reviewed: June 15, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division