Abstract by Nitish Bhardwaj
Chemistry and Biochemistry
Analysis and characterization of PM 2.5 using GC-MS OAM and ToF-SIMS.
In the state of Utah there exists a significant problem with high concentrations of particulate matter in air. We have developed a new instrument that uses gas chromatography/mass spectrometry (GC-MS) to analyze the organic compound component of PM2.5 (particles 2.5 micrometers in diameter and smaller). The GC-MS Organic Aerosol Monitor (GC-MS OAM) collects PM2.5 on a deactivated quartz fiber filter after which the instrument thermally desorbs the organic components of the particles into a GC-MS for analysis. After desorption into the GC-MS OAM the refractory component of PM2.5 remains on the filter. The refractory fraction of PM2.5 is typically composed of the inorganic component of particulate matter. Quartz fiber filters that were used in the GC-MS OAM for collection of PM during episodes of low and high concentration of pollution where analyzed using time-of-fight secondary ion mass spectrometry (ToF-SIMS). The relationship between the organic and refractory component of PM2.5 during episodes of low and high particulate matter concentrations in the Salt Lake Valley will be presented.