By Leslie Silverman
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14, with an adapter to accommodate an 8 X 10-in. 35 FIG. 14. High-volume air sampler. (From Silverman and Viles, Ref. ) 2-3 Collection Methods Which Classify Particles into Size Groups 49 Deep beds of fibrous filters composed of natural (cotton), synthetic (Dynel, Saran), or mineral fibers (glass, silica, Fiberfrax) of small diameter make excellent low-resistance, high-efficiency dust filters. Nevertheless, they are of little value for dust sampling for particle size analysis, since the collected dust tends to become size-segregated as it deposits throughout the depth of the very porous filter bed (with the smallest particles depositing near the discharge end and the coarsest near the entry end).
8a. 05 cm) through which the aerosol sample is drawn at a velocity of 140 cm/min. 025-cm diameter), suitably insulated, is centrally located between the cool adjacent walls. When the central wire is maintained at 100°C, the thermal gradient in the air passage is of the order of 4000 degrees per centimeter, due to the close spacing. The sharp thermal gradient produces differential molecular bombardment and migration of aerosol particles to the adjacent cool surfaces (thermophoresis), where they are collected on glass microscope coverslips, to which they adhere by molecular attraction.
Van de Hulst, Light Scattering by Small Particles, John Wiley & Sons, New York, 1957. 19. D. C:, 1950; reissued 1963, Report TID-4500. 20. B. M. Smith, J. Wagman, and B. R. Fish, Interaction of Airborne Particles with Gases, Environ. Sci. , 5:558 (1969). 21. A. D. , New York, 1969. 22. R. Whytlaw-Gray and H. S. Patterson, Smoke, Edward Arnold and Company, London, 1932. 23. F. Stein, N. Esmen, and M. Corn, The Density of Uranine Aerosol Particles, Am. Ind. Hyg. Assoc. , 27:428 (1966). 24. G. A. Sehmel, The Density of Uranine Particles Produced by a Spinning Disc Aerosol Generator, Am.