Table 2. Isotope Fractionation Parameters of DEP and DBP during Photochemical Oxidationa.
| reaction system | concentration | εC (‰) | R2 | εH (‰) | R2 | Λ | ||
|---|---|---|---|---|---|---|---|---|
| DEP | UV/PPHA/O2 | 0.4 g L–1 | –1.8 ± 0.4 | 0.97 | –9.0 ± 1 | 0.98 | 3.2 ± 0.8 | this study |
| UV/PPHA/O2_Free | 0.4 g L–1 | n.d. | n.d. | n.d. | n.d. | n.d. | this study | |
| UV/Rose Bengal | 0.39 mM | n.d. | n.d. | n.d. | n.d. | n.d. | this study | |
| UV/3-MAP | 0.2 mM | n.d. | n.d. | n.d. | n.d. | n.d. | this study | |
| UV/H2O2 | 50 mM | –2.3 ± 0.4 | 0.99 | -6.8 ± 1.3 | 0.99 | 2.4 ± 0.2 | Zhang et al.21 | |
| DBP | UV/PPHA/O2 | 0.4 g L–1 | -3.3 ± 1.0 | 0.98 | 28 ± 9 | 0.96 | –11.4 ± 4.7 | this study |
| UV/AHA/O2 | 0.4 g L–1 | -2.0 ± 0.9 | 0.99 | -15 ± 5 | 0.91 | 5.3 ± 2.5 | this study | |
| UV/NOM/O2 | 0.4 g L–1 | -1.4 ±0.7 | 0.95 | 19 ± 3 | 0.90 | –11.2 ± 5.7 | this study | |
| UV/PPHA/O2_Free | 0.4 g L–1 | 0.9 ± 0.2 | 0.93 | -12 ± 4 | 0.96 | –6.2 ± 2.3 | this study | |
| UV/PPHA/O2/2-propanol | 0.4 g L–1 | 0.7 ± 0.2 | 0.99 | -10 ± 4 | 0.97 | –4.6 ± 1.5 | this study | |
| UV/PPHA/O2/TMP | 0.4 g L–1 | –0.8 ± 0.3 | 0.97 | –9 ± 2 | 0.97 | 8.7 ± 2.5 | this study | |
| UV/PPHA/O2_Free/TMP | 0.4 g L–1 | n.d. | n.d. | n.d. | n.d. | n.d. | this study | |
| UV/H2O2 | 2.15 mM | –0.9 ± 0.2 | 0.97 | –9.3 ± 1.2 | 0.96 | 9.0 ± 2.3 | Zhang et al21 | |
| UV/Rose Bengal/O2 | 0.39 mM | 0.7 ± 0.2 | 0.98 | –4 ± 1 | 0.97 | –5.8 ± 1.4 | this study | |
| UV/Rose Bengal/O2_free | 0.39 mM | 0.6 ± 0.2 | 0.97 | –4 ± 1 | 0.99 | –5.7 ± 2.5 | this study | |
| UV/3-MAP | 0.2 mM | 1.0 ± 0.4 | 0.97 | –4 ± 2 | 0.95 | –4.8 ± 1.1 | this study | |
| UV/4-MBA | 0.2 mM | 0.8 ± 0.2 | 0.93 | –4 ± 1 | 0.99 | –4.6 ± 1.4 | this study |
a
Uncertainty given as 95% confidence interval. n.d., not detected, as no degradation could be assessed. n.a., not analyzed.