A System for Appraising Airborne Populations of Pollens and Spores

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Abstract
This paper describes a rotating arm impinger system and a method for quantitatively transferring collected particulate matter to glass microscope slides for assessment. The collector system employs two vertical bars mounted parallel to the axis of a constant-speed battery-driven motor. A thin coating of Dow Cornng 269 Adhesive on the bars serves to retain impinged particles. The collected particles are transferred by pressure contact to microscope slides that have been lightly coated with General Electric G-697 Silicone compound. The system has a sampling rate of 80 liters per minute. Measured collection efficiency was 54.9% for Paper Mulberry pollen 11-13 microns diameter and 89.5% for P. Graminis spores 14 × 24 microns.

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