Sizing of atmospheric particulates with a high volume cascade impactor |
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Authors: | OLew Wood Carl H Erickson |
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Institution: | Wood Environmental Associates 811 Woodshire Circle Murray, Utah 84107 USA;Andersen 2000, Inc. 12365 S. 970 E. Draper, Utah 84020 USA |
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Abstract: | This article describes the development of a high volume cascade impactor with a sampling rate of 20 ft3/min that can be powered by high volume blowers in common use for air sampling. With this impactor it is now possible to collect enough sample of atmospheric particulates in a 24 hour period to conveniently determine an aerodynamic size distribution of suspended particulates by gravimetric analysis. The impactor has four stages and an after-filter and separates particles from the air stream by inertial impaction. The effective cutoff diameters for the stages are 7.0, 3.3, 2.0, and 1.1 microns. The after-filter traps the submicron material. |
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