Journal
ATMOSPHERIC ENVIRONMENT
Volume 39, Issue 37, Pages 6945-6956Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2005.02.053
Keywords
organic aerosol; sampling artifact; GCMS; n-alkanes; hopanes; carboxylic acids
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Sampling artifacts for molecular markers from organic speciation of particulate matter were investigated by analyzing forty-one samples collected in Philadelphia as a part of the Northeast Oxidant and Particulate Study (NEOPS). Samples were collected using a high volume sampler with two quartz fiber filters in series. n-Alkanes (C23-C31), hopanes (C27-C31), and n-alkanoic acids (C10-C22) were analyzed by gas chromatography-mass spectrometry (GCMS). The extent of artifact error was dependent on vapor pressure and species concentration. Particulate organic species are classified into the following three categories: (1) the amount collected on the backup filter was often a large fraction of the amount collected on the front filters (n-alkanes C23 and C24, n-carboxylic acids C10-C14); (2) the amount collected on the backup filter was consistently a small fraction of the amount collected on the front filter (n-alkanes C25-C28, hopanes C27-C30, n-carboxylic acids C15-C18, and dicarboxylic acids C3-C9); (3) the species was rarely observed on backup filters (n-alkanes C29-C31, hopanes C31 and C32). Published by Elsevier Ltd.
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