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HIGH VOLUME VIRTUAL IMPACTOR FOR SAMPLING FINE AND COARSE PARTICLES
Citation:
Marple, V., B. Liu, AND T. Burton. HIGH VOLUME VIRTUAL IMPACTOR FOR SAMPLING FINE AND COARSE PARTICLES. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-92/138 (NTIS PB92166727), 1990.
Description:
Final design, calibration, and field testing have been completed for a new 1.3 m3/min (40 cfm) High-Volume Virtual Impactor (HVVI). ield tests have demonstrated that the new classifier/collector works well as an accessory to the existing PM10 Size Selective Inlet high-volume samplers. he HVVI provides two fractions of PM10 mass, both of which are collected by filtration. he fine fraction (0-2.5 um aero. dia.) is collected on the standard 20.3 X 25.4 cm (8-x 10-in) high-volume filter; the coarse fraction (2.5-10 aero. dia.) is collected on a 5.1 x 15.2 cm (2- X 6-in) filter. Coarse flow through the receiver tubes is limited to 0.166 m3/min (2 cfm), 5- of the total flow. he operating pressure drop across the HVVI stages is sufficiently high to make changes in pressure across the collection filters insignificant. he HVVI filter holder assembly facilitates loading/unloading samples in the laboratory, thus eliminating damage due to handling filters in the field. ize separation characteristics of the HVVI agree well with those for the 16.7 L/min commercially available dichotomous sampler with the 50% effectiveness (cut-point) occurring at 2.5 um. Applying laboratory determined particle losses to the typical ambient particle sass size distribution described in Federal Register 49, 40 CFR, Part 53, Table 0-3, the HVVI fine fraction total mass loss is <0.8% for liquid particles and <0.1% for solid particles; coarse fraction total mass loss is <2.5% for liquid particles, and <0.2 for solid particles.
