AAAR 33rd Annual Conference
October 20 - October 24, 2014
Rosen Shingle Creek
Orlando, Florida, USA
Abstract View
Concentrated Particle Collection in to Liquid for Toxicological Studies
GREGORY LEWIS, Steven Spielman, Arantzazu Eiguren Fernandez, Susanne Hering, Aerosol Dynamics Inc.
Abstract Number: 506 Working Group: Instrumentation and Methods
Abstract We describe advances in our three-stage laminar flow water condensation system for concentrated particle collection into liquid for toxicological studies. We use a three-stage Growth Tube system which has a low output temperature and dew point, greatly decreasing water condensation from the sampling flow in to the collection medium. Particles as small as 8 nm can be activated and grown without exceeding 25 deg C in the majority of the flow. By increasing the number of delivering nozzles we are capable of depositing ambient aerosols into a liquid volume of less than 150 uL. Liquid collection allows for sampling of water-soluble, vapor-phase components as well as particles, mimicking exposure in real environmental conditions.
This approach has several advantages over standard filter collection. The concentrated nature of the suspension greatly reduces sample collection time and the direct collection into suspension limits morphological and chemical changes that may happen during extraction and re-suspension from filters. The sampler is portable, and can run unattended for several days. Particle collection efficiencies over 95% are measured for sizes between 10 nm and 2.5 um.