Table 2. Average Parameters of Molecules Detected by UHPLC/(+)ESI-HR-QTOFMS in Aerosol Particles as a Function of Oxidant Used in Glyoxal + S(IV) + Sunlight-Experimentsa.
| average parameter | no oxidant | O2 | OH radical | |||
|---|---|---|---|---|---|---|
| experiment number | 7 | 3 | 6 | 1 | 4 | 5 |
| degrees of unsaturation | 5.0 | 5.4 | 4.8 | 6.0 | 3.2 | 5.8 |
| x̅ = 5.1 ± 0.4 | x̅ = 4.0 ± 1.6 | |||||
| O/C ratio | 0.52 | 0.42 | 0.40 | 0.39 | 0.24 | 0.34 |
| x̅ = 0.41 ± 0.01 | x̅ = 0.28 ± 0.08 | |||||
| C atoms/molecule | 16.5 | 17.0 | 16.6 | 17.9 | 13.7 | 18.2 |
| x̅ = 16.8 ± 0.3 | x̅ = 15.1 ± 2.5 | |||||
| C oxidation state | –0.45 | –0.68 | –0.79 | –0.72 | –1.24 | –0.79 |
| x̅ = −0.73 ± 0.07 | x̅ = −1.09 ± 0.3 | |||||
a
Notes: average values for each experiment are weighted by MS ion counts for each detected species. Averages (with uncertainties) calculated from multiple experiments are shown as x̅ values.