Abstract
Suspended particulate matter was sampled at a location on the roof of the Graduate School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania by means of a horizontal elutriator. Particles in the equivalent diameter range 1.5μM to 16μM were classified according to the ratio Projected area diameter (d p acrodynamic equivalent diameter (d p) and also according to particle shape. The value of ( d p d e )varied from 0.5 to 3.0. Estimates of the size frequency weight distribution of particles based on d p was demonstrated to differ by as much as 500 per cent from the distribution derived from d e . These results suggest that d e must be used to estimate weight distributions of atmospheric aerosols. Size distributions based on microscopic sizing ( d p ) cannot be utilized for this purpose. The average range of occurrence of ( d p d e ) for different particle shapes was determined. Daily variations in ( d p d e ) were large, due to the large daily variations in the occurrence of particles of different shapes. The particle size distribution was compared to the theoretical distributions proposed by Junge and by Friedlander (“self-preserving” distribution) for the atmospheric aerosol. The data adhered more closely to the Friedlander distribution, but either could be utilized as a satisfactory first approximation in the particle size range 1.5–10μm equivalent diameter.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
