Figures & data
TABLE 1 OCEC and SMPS measurements taken from the same SOA sample
FIG. 1 (A) ELSD recovery (measured mass/injected mass) of several test compounds (aspartame, diacetyl benzene, and terephthalic, pinic, pinonic, suberic, and succinic acids) vs. vapor pressure. (B) Fraction in the particle phase vs. vapor pressure for several known monomers of α-pinene SOA at an aerosol mass concentration of 440 μg/m3. In both figures, dashed lines denote 1.5 × 10−4 torr. Vapor pressures were calculated with EPI Suite (EPA, www.epa.gov/oppt/exposure/pubs/episuite.htm).
TABLE 2 Mass recoveries a from filters extracted and reextracted by different solvents
TABLE 3 Matching molecular formulas a for two extractions of the same sample
TABLE 4 Average double bond equivalents (DBE), O:C and H:C ratios of matching peaks a
FIG. 2 Standard addition plots for pinic (a) and pinonic (b) acids based on the signal intensities of (M-H)− in the negative ion ESI mass spectra of samples that were reconstituted in acetonitrile. Triangles indicate the averaged data for water extracted SOA, diamonds for acetonitrile, and squares for a 50/50 mixture of the two. The absolute value of the x-axis intercept is equal to the concentration of analyte in the original sample before the addition of standard. Weight percent is calculated from the mass of analyte added divided by the mass of SOA in the extract as determined by ELSD.
