AAAR 31st Annual Conference
October 8-12, 2012
Hyatt Regency Minneapolis
Minneapolis, Minnesota, USA
Abstract View
High-Time Resolution Measurement of Particulate Matter Mass and Chemical Speciation
CHEOL-HEON JEONG, Krystal J. Godri, Greg J. Evans, SOCAAR, University of Toronto
Abstract Number: 248 Working Group: Instrumentation and Methods
Abstract Continuous high-time resolution measurements of particle mass and chemical composition, collected over an extended time course are needed to provide important links between sources and exposure in rapidly changing environments. New instruments are facilitating such measurements but their capabilities and limitations need to be explored and understood so as to properly use the valuable data they can provide. An Aerosol Chemical Speciation Monitor (Aerodyne ACSM) and a range of PM instruments were deployed in downtown Toronto, Canada at a near- roadway site in December 2011-March 2012. The ACSM measured non-refractory chemical composition of PM1, i.e., organics, nitrate, sulphate, ammonium, and chloride with 30 min resolution. Total mass concentrations were measured with a Filter Dynamics Measurement System-Tapered Element Oscillating Microbalance (FDMS-TEOM), a Synchronized Hybrid Ambient Real-time Particulate Monitor (SHARP) and DustTraks. Particle number and size distributions were measured by a Fast Mobility Particle Spectrometer (FMPS) and an Aerodynamic Particle Sizer (APS). Carbonaceous species mass concentration and optical properties were detected by a Sunset Lab OCEC analyzer and a Photo Acoustic Soot Spectrometer (PASS). In order to characterize the performance of the instruments, an equivalence study was performed. Particulate matter mass closure estimated by integrating ACSM chemical speciation data and elemental carbon was compared to mass concentrations measured by the FDMS-TEOM and the SHARP as well as estimated mass concentrations converted from the FMPS and APS integrated size distributions. Differences between these multiple measurements were identified and these, along with factors influencing the performance of the instruments, will be discussed.