Characteristics, Sampling Efficiencies, and Possible Improvements to the Aerosol to Liquid Particle Extraction System (ALPES)

摘要

Sampler characteristics and sampling efficiency measurements of the Aerosol to Liquid Particle Extraction System (ALPES) were determined wing monodisperse polystyrene latex (PSL) microspheres and fluorescent oleic acid droplets with fluorometer analysis. Sampling efficiency measurements of ALPES were determined using 0.5- and 1-micrometer PSL microspheres, and 5 micrometers sodium fluorescein tagged oleic acid (fluorescent oleic acid) particles. The results show that the ALPES has a peak efficiency of 57.4 +/- 5.1% for 5- micrometer particles. Tests conducted to determine possible improvements to the sampler showed that slowing the air flow rate of the sampler significantly increased the sampling efficiency, and washing the inside of the outer cylinder increased the collection efficiency. Dry versus wet collection tests showed that there is no difference in collection efficiency for these conditions.