AAAR 37th Annual Conference October 14 - October 18, 2019 Oregon Convention Center Portland, Oregon, USA
Abstract View
Traffic Related Aerosols Measurement with HR-ELPI+ Using Sintered Collection Plates
ANSSI ARFFMAN, Peter Lambaerts, Markus Nikka, Erkki Lamminen, Dekati Ltd.
Abstract Number: 518 Working Group: Instrumentation and Methods
Abstract In this study, the performance of HR-ELPI+ (Dekati Ltd.) inversion with sintered collection plates on soot and urban aerosols were investigated. The HR-ELPI+ was challenged with diesel soot and traffic emitted aerosols, and the experimental results were analysed using numerical methods. Elaborate analysis of the results was performed as the calibration of instrument is provided only for the spherical liquid aerosols. This needs to be understood, when comparing measurement results between instruments based on the different physical measurement principles.
Soot aerosol for the experiments was generated with idling diesel passenger car. The exhaust gas was first diluted with the eDiluter (Dekati Ltd.) using heated primary dilution to avoid the condensation of volatile gas phase species on soot (200°C). After the dilution, the exhaust particle size distribution was measured with two HR-ELPI+’s equipped with plain and sintered collection plates, and an SMPS (model 3082, TSI Inc.) Measurement results were further analyzed by numerically simulating the instrument response for different primary particle size and mass fractal dimensions, and their effect on the HR-ELPI+ inversion were quantified. Long-term urban aerosol measurements were conducted at the air quality measurement station in Finnish inland city, and the time series results were analysed in the study.
Results of the study showed that the HR-ELPI+ with sintered and plain collection plates provides consistent results for agglomerated soot particles. The inversion was found to behave similarly with the normal ELPI+ calculation (cut-point concept) with respect to the effective density value that is a robust feature regarding the inversion. Results also showed that the average aerodynamic particle size was below the average mobility particle size in all measurements giving the average effective density below the unit density value.