Table 1.
Summary of experimental conditions
| Expt. | Experiment variant | α-pinene (µg m−3) | limonene (µg m−3) | N2O5 (ppb) | NO2 (ppb) |
|---|---|---|---|---|---|
| APN-1 | Pure α-pinene, low conc. | 135.1 ± 9.5 | — | 100 | 83.5 |
| APN-2 | Pure α-pinene, med conc. | 291.4 ± 11.1 | — | 200 | 154.9 |
| APN-3 | Pure α-pinene, high conc. | 449.4 ± 13.5 | — | 300 | 219.6 |
| LIM-1 | Pure limonene, low conc. | — | 24.3 ± 1.9 | 40 | 30.0 |
| LIM-2 | Pure limonene, med conc. | — | 62.0 ± 3.0 | 80 | 54.9 |
| LIM-3 | Pure limonene, high conc. | — | 89.1 ± 3.6 | 120 | 78.9 |
| LIM-4 | Pure limonene, low conc., oxidant-first | — | 30.1 ± 2.5 | 40 | — |
| LIM-5 | Pure limonene, low conc., oxidant-first | — | 30.1 ± 2.5 | 40 | — |
| SEQ-1 | Sequential oxidation | 142.6 ± 6.1 | 28.4 ± 2.8 | 140 | 110.1 |
| SEQ-2 | Sequential oxidation | 149.4 ± 6.1 | 32.6 ± 3.3 | 140 | 112.0 |
| MIX-1 | Simultaneous oxidation | 141.1 ± 9.5 | 29.2 ± 2.5 | 140 | 105.0 |
| MIX-2 | Simultaneous oxidation | 138.6 ± 9.5 | 27.9 ± 1.5 | 140 | 116.7 |
Experiment names are based on the type of volatile organic compounds (VOCs) or order of injection. α-pinene and limonene are the initial concentrations measured by a gas chromatograph-flame ionization detector (GC-FID). N2O5 concentration corresponds to the total amount injected. NO2 is the concentration measured after the complete consumption of α-pinene and/or limonene.