CALIBRATION STUDIES OF A NEW SUB-MICRON AEROSOL SIZE CLASSIFIER

The size-fractionating charateristics of a new aerosol classifier (7) operating in the size range 0.015 to 0.5 micron were investigated with homogeneous aerosols of zinc ammonium sulfate, polystyrene latex spheres, and sodium chloride cubes. Size analyses were carried out by electron microscopy. Characteristic deposition curves were nearly identical in the small-particle collection zone agreeing with Whitby's data for methylene blue spheres, but differed significantly, for the zone, above 0.2 micron. Preliminary application of the classifier to ambient air sampling has yielded size distribution data for lead in urban Cincinnati. © 1969.