Abstract
A high flow rate four-stage impacfor was developed for the determination of aerosol concentration as a function of both particle size and time. The unit is very useful for long-term sampling intervals (24 hr) and for sampling very dusty atmospheres. Gas-borne particulate matter is collected out on four rotating drums, each with a collection surface area of about 10 sq in.; this allows a large quantity of materials to be collected without danger of particle build-up and blow-off. A particle size-collection efficiency calibration for the unit is presented together with experimental data on wall losses, surface coatings, and other important operational considerations.
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