Novel Approaches to Measurement of the Organic Components of Airborne Particles for Health Assessment Studies

October 24, 2002 - 12:00pm
Bldg. 90

Recent studies show that organic aerosols may play a key role in health effects of airborne particulate matter. However, accurate exposure assessment is hampered by the chemical complexity of the organic components and large sampling artifacts, as well as experimental cost. To meet these challenges, a new concept for aerosol instrument design has been developed. The concept uses sorbent-coated porous foam to combine particle size selection and gaseous removal functions. Based on this new concept, a series of more accurate, compact, lightweight, and low-cost instruments can be designed for outdoor, indoor and personal sampling. The presentation will describe the Particulate Personal Organic and Mass Sampler (PPOMS), a new device that has established proof-of-concept. A field evaluation of the PPOMS using standard methods was conducted in Seattle, WA during 2000 and 2001. Even though the PPOMS was much lighter, more compact and lower cost than similar available products, it performed as well as those standard methods did. For its particle size selection function, the PPOMS had good agreement with PM2.5 Federal Reference Method (FRM) and outperformed the popular PM2.5 Personal Environment Monitor (PEM). For its denuder function, it eliminated the organic aerosol artifact as well as the LBNL's Integrated Gas and Particle Sampler (IOGAPS) did. The PPOMS meets a significant current challenge for indoor and personal sampling of particulate organic carbon. Our new concept can significantly advance organic aerosol measurement technology for exposure assessment, as well as organic aerosol measurement in atmospheric chemistry studies.

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