10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
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In-Situ Spectroscopic Analysis of PM Chemical Composition in a Low-Cost Particle Collector
HE JIAYANG, Byron Ockerman, Igor Novosselov, University of Washington
Abstract Number: 442 Working Group: Low-Cost and Portable Sensors
Abstract The toxic potential of inhaled particulate matters (PM) is dependent on particle size, number density, and their chemical composition. Within the respiratory tract, particle size determines the region of deposition, residence time, solubility and tissue uptake; the particle’s chemical composition determines the potential for biochemical reaction with tissue and cells. Identifying the sources of fine and ultrafine PM exposure is necessary for effective health-related interventions for sensitive population (i.e., asthma patients). Currently, epidemiological studies rely on filters or inertial impactors to sample particulates, those often have problems with ease of use and substrate overloading. The ability to collect particles in a wide size range is essential for personal samplers enabling a comprehensive assessment of the PM exposure. However, it is challenging to collect particles over a wide size range with high collection efficiencies within one sampler due to the mismatch in particles electrical mobility and their inertial properties. We present the design and evaluation of a compact, low-cost cartridge that uses inertial and electrostatic collection mechanisms. The low weight of the cartridge (< 1.5 g) allows for gravimetric sample analysis. The compatibility with pipette elution allows for simple sample elution procedure. The collection performance of the cartridge was evaluated in laboratory studies using polydisperse ceramic particles and combustion-generated aerosols. Typical collection efficiencies are above 80% for inert particles and above 60% for combustion-generated PM. The cartridge is fabricated using UV transparent material, enabling in-situ fluorescence analysis of the collected sample. Compatible with standard cuvette holders, the cartridge can be analyzed using standard laboratory equipment.