AAAR 33rd Annual Conference
October 20 - October 24, 2014
Rosen Shingle Creek
Orlando, Florida, USA
Abstract View
Initial Field Deployment of a Custom Multi-Channel Tandem Differential Mobility Analyzer (mc-TDMA)
CHRISTOPHER OXFORD, Yang Wang, Steven Dhawan, David Hagan, Dhruv Mitroo, Pratim Biswas, Brent Williams, Washington University in St. Louis
Abstract Number: 282 Working Group: Instrumentation and Methods
Abstract A multi-channel Tandem Differential Mobility Analyzer (mc-TDMA) has been constructed for physical characterization of fine particles during field and laboratory studies. The mc-TDMA employs 2 long column DMAs (TSI, Model #3081), a condensational particle counter (TSI, Model #3776), and is fully automated to switch between a volatility channel, a hygroscopicity channel, a Scanning Mobility Particle Sizer (SMPS) channel, and an auxiliary channel. Here we present details on the instrument construction and operation as well as results from its first deployment to the Saint Louis Air Quality Regional Study (SLAQRS) in late summer 2013 where it sampled ambient particles as well as secondary aerosol downstream of a potential aerosol mass (PAM) oxidation chamber.