Dicarboxylic acid concentration trends and sampling artifacts |
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| Authors: | Joshua Ray Stephen R. McDow |
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| Affiliation: | aEnvironmental Science Program, Drexel University, Philadelphia, PA, USA;bHuman Exposure and Atmospheric Sciences Division, National Exposure Research Lab, US Environmental Protection Agency, Research Triangle Park, NC, USA |
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| Abstract: | Dicarboxylic acids associated with airborne particulate matter were measured during a summer period in Philadelphia that included multiple air pollution episodes. Samples were collected for two 10 h periods each day using a high-volume sampler with two quartz fiber filters in series, and analyzed by gas chromatography mass spectrometry (GCMS) with diazomethane derivatization. Among the dicarboxylic acids investigated, phthalic acid and adipic acid exhibited the greatest diurnal variations and the strongest linear relationship with maximum daily ozone concentration. Dicarboxylic acids and ozone concentration exhibited a poor linear relationship with organic to elemental carbon ratio. All species investigated were affected by significant sampling artifact errors at low concentrations, but sampling errors were negligible at high concentrations observed during ozone episodes. |
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| Keywords: | Dicarboxylic acids Secondary organic aerosol Sampling artifacts |
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