Respiratory Deposition Of Atmospheric Aerosols
Author(s)
N. A. Kgabi
Abstract
While filtration occurs in a fixed system at a steady flow rate, respiratory
deposition occurs in a system of changing geometry, with a flow that changes
with time and cycles in direction. An understanding of how and where particles
deposit in our lungs is necessary in order to evaluate properly the toxicity of
aerosols. In this study the effect of particle size, wind speed and direction on
respiratory deposition was investigated. The inhalable fraction (IF), which gives
an indication of the efficiency of particle entry into the nose or mouth, as well as
the total deposition fraction (DF) in the respiratory system, showed an increase
as particle diameter decreased. Both the IF and DF showed an increase as
ambient air velocity increased above 4 m.s-1 for particles with aerodynamic
diameters 10, 2.5, 1.0 and 0.4 µm. A reasonable correlation between mass
concentrations and wind speed was obtained for all the sizes investigated.
Keywords: inhalability, respiratory deposition, particle size, wind speed.
Keywords
inhalability, respiratory deposition, particle size, wind speed
Related Book
Other papers in this volume
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