Abstract
A polarity-based extraction/fractionation method validated with standard compounds was used to characterize organic aerosol samples collected during the Pittsburgh Air Quality Study (PAQS). Organic extracts were separated into 5 polarity classes by sequential elution with hexane, dichloromethane, ethyl acetate, acetone, and methanol. Organic mass (OM) and carbon mass (OC) were measured in samples, their extracts, and their corresponding fractions yielding OM/OC ratios and the contribution of each polarity fraction to total OM. The study average OM/OC ratio for each fraction [(OM/OC)fraction] varied from 1.37 for the hexane fraction to 2.25 for the methanol fraction. OM/OC ratios for “non-extractable” organics ((OM/OC)N-E) were also predicted; the study average (OM/OC)N - E was 2.54, consistent with ratios of 2.1–3.2 for water-soluble organic aerosol species. Annual average ratios with and without the contributions of the “non-extractable” material [(OM/OC)total and (OM/OC)extract, respectively] were 2.05 ...
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