AAAR 32nd Annual Conference
September 30 - October 4, 2013
Oregon Convention Center
Portland, Oregon, USA
Abstract View
Mass-mobility Measurements of Cigarette Smoke Using a CPMA-DMS System
TYLER JOHNSON, Ross Cabot, Conor Treacy, Caner Yurteri, Colin Dickens, John McAughey, Jonathan Symonds, Jason S. Olfert, University of Alberta
Abstract Number: 468 Working Group: Health Related Aerosols
Abstract Tobacco smoke is a dynamic mixture of vapor and particulate matter. The volatile nature of this aerosol causes its properties to change over time, making particle characterization difficult. A Centrifugal Particle Mass Analyzer (CPMA) and Differential Mobility Spectrometer (DMS) were used to measure the real-time mass-mobility of cigarette smoke particles. These characteristics are important for modelling lung deposition or smoke particle aerodynamic behavior.
Smoke was produced using a Puff Inhale Exhale (PIE) simulator, which mimics the transient process of a human puffing then inhaling a cigarette. On puffing (35mL puff of 2s duration), the smoke was charged using a radioactive neutralizer, classified by mass-to-charge ratio by a CPMA, and the classified aerosol mobility size distribution measured by a DMS. Since the CPMA classifies particles by mass-to-charge ratio and multiple-charged particles were present, the measured mobility size distribution had to be corrected for this effect. This correction, outlined by Johnson et al. (2012), removed the contribution of multiple-charged particles from the measured DMS ring currents and re-inverted the data.
The effective density was determined to be constant in the 200 to 400 nm mobility diameter range with an average of 1044 kg/m$^3. Lipowicz (1988) also determined the effective density to be constant in the 1.1 to 1.5 micrometer mobility diameter range with an average of 1100 kg/m$^3 using aged smoke in a Millikan cell. The variation in effective density of smoke particles between different puffs, cigarettes and smoking parameters was also investigated.
References
Johnson, T.J., Symonds, J.P.R., Olfert, J.S. (2012). Validating a centrifugal particle mass analyzer and differential mobility spectrometer system for mass-mobility measurements. AAAR 31st Annual Conference, Minneapolis, Minnesota, United States, Oct. 9, 2012.
Lipowicz, P.J. (1988). Determination of cigarette smoke particle density from mass and mobility measurements in a Millikan cell, Journal of Aerosol Science, 19, 587–589.