Record Display for the EPA National Library Catalog

RECORD NUMBER: 17 OF 927

OLS Field Name OLS Field Data
Main Title Aerodynamic Classification of Fibers with Aerosol Centrifuges.
Author Martonen, T. B. ; Johnson., D. L. ;
CORP Author Health Effects Research Lab., Research Triangle Park, NC. Environmental Toxicology Div. ;Army Environmental Hygiene Agency, Aberdeen Proving Ground, MD.
Publisher c1990
Year Published 1990
Report Number EPA/600/J-90/506;
Stock Number PB91-199927
Additional Subjects Fibers ; Particle size distribution ; Aerodynamic characteristics ; Centrifuges ; Aerosols ; Respiratory system ; Mathematical models ; Laboratory tests ; Occupational safety and health ; Reprints ; Pulmonary deposition
Holdings
Library Call Number Additional Info Location Last
Modified
Checkout
Status
NTIS  PB91-199927 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 09/04/1991
Collation 19p
Abstract
The constituent particles of many ambient and workplace aerosols of health effects concerns are of fibrous and aggregate geometric shapes. The sites of deposition in the human respiratory system are primarily related to the mass median aerodynamic diameters of inhaled particle size distributions. Therefore, to assess potential exposure hazards it is necessary to have accurate kinetic classifications of airborne particulate matter. Centrifugal spectrometers give direct and continuously graded measures of the aerodynamic size distributions of sampled aerosols. A mathematical description of particle behavior in spiral channel centrifuges has been presented, and substantiated by comparisons with laboratory calibration data using polystyrene latex spheres. Here, the theory is extended to non-spherical forms by incorporating appropriate dynamic particle shape resistance factors in trajectory equations. It is demonstrated how optimum centrifuge performance is made possible by the a priori determination of favorable operating conditions permitting high-resolution characterization; specifically for fibrous aerosols.