Aerosol Production and Characterization

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Abstract
A comparison of laboratory and field practices indicates that marked differences may occur between laboratory and field aerosols, and that differences in methods of characterization make comparable results difficult to achieve. A review of the electrical properties of aerosols show that the use of atomization, a favorite laboratory technique for producing aerosols, can lead to very high electrical mobilities, making reproducibility difficult and causing anomalous experimental results. The difficulties involved in extrapolating from a size frequency distribution to a distribution of activity as a function of aerodynamic diameters are discussed. The sampling properties of rectangular jet, single round jet and multiple round jet impactors are summarized and approximate relationships are given on which to base the design of impactors for specific purposes. The sampling characteristics of the Conifuge and the aerosol spectrometer are summarized.

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