Real-time characterization of ultrafine and accumulation mode particles in ambient combustion aerosols

摘要

The diffusion charging sensor (DC), photoelectric aerosol sensor (PAS) and condensation particle counter (CPC) are real-time particle instruments that have time resolutions < 10 s and are suitable for field use. This paper shows how the realtive fractin of nuclei mode particles (D < = 50 nm) in ambient combustion aerosols can be determined, along with the coverage degree of the respective accumulation mode particles with a model diameter of approx 100 nm. Main tools for interpretation are the diameter of a average surface D_(Ave, S) (obtained from CPC and DC measurements) and PAS/DC versus D_(Ave, S) scatter plots. Compared to the scanning mobility particle size (SMPS), which is a standard instrument for aerosol particle size distribution measurements, the presented method has a limited accuracy, but is substantially faster. Additionally, it is experimentally less demanding than SMPS measurements, esepcially for field applications.