Comparison of Sampler Collection Efficiency Measurements Using a Polydisperse Solid Aerosol and A Monodisperse Liquid Aerosol
Final rept. Sep 1998-May 2000
EDGEWOOD CHEMICAL BIOLOGICAL CENTER ABERDEEN PROVING GROUND MD
Pagination or Media Count:
This study was conducted to determine the merits of using a single test of a polydisperse solid aerosol in place of multiple tests of monodisperse liquid aerosols in the characterization of aerosol sampling systems. The polydisperse aerosol chosen was an aluminum oxide Al2O3 commercial abrasive. Analysis of the Al2O3 particles was by a Coulter Particle Size Analyzer. The monodisperse aerosols were fluorescent oleic acid droplets generated by a vibrating orifice aerosol generator VOAG. Analysis of the fluorescent monodisperse particles was by UV fluorometry. The results show that over the 2-6 micron size range there is sufficiently good agreement between the rapid polydisperse solid aerosol method and the labor intensive liquid monodisperse aerosol method to warrant the use of the polydisperse test as a rapid screening device. Above 6 microns, the solid particles show evidence of bounce and re-entrainment into the aerosol flow. In turn, this results in a higher than expected sampling efficiency for solid particles for the particular aerosol sampler tested.
- Physical Chemistry