The objective of this research is to investigate the influence of the particulate mass concentration, C, and the gas phase of an aerosol upon the capability of a spinning spiral duct centrifuge to function as an aerosol particle size spectrometer. The centrifuge classifies an aerosol particle by its aerodynamic diameter. The instrument is calibrated experimentally with a dilute (Cm « 10 gm cm-3) laboratory aerosol composed of Dow polystyrene latex spheres. Under calibration conditions the gas phase of the aerosol, and the winnowing medium, are both dry air. Aerosols of environmental concern nay differ from the laboratory calibration aerosol in two main respects:the carrying medium in which particles are suspended may be other than dry air, and the particulate mass concentration may be large.
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