Table 3.
Diagnostic ratios of selected PAHs at different samples.
| Diagnostic Ratios | Main Source a | Dissolved Phase of Raw Sewage | Dewatered Sludge | ||||||
|---|---|---|---|---|---|---|---|---|---|
| 23 November | 2 December | 9 December | 17 December | 23 November | 2 December | 9 December | 17 December | ||
| ΣLMW/ΣHMW | <1 (Combustion) | 5.14 | 5.86 | 5.33 | 6.13 | 0.85 | 0.75 | 0.66 | 0.67 |
| >1 (Petroleum) | |||||||||
| ANT/(ANT + PHE) | <0.1 (Petroleum) | - | - | - | - | 0.08 | 0.08 | 0.05 | 0.03 |
| >0.1 (Combustion) | |||||||||
| FLT/(FLT + PYR) | <0.4 (Petroleum) | - | - | - | - | 0.76 | 0.88 | 0.79 | 0.80 |
| 0.4–0.5 (Petroleum combustion) | |||||||||
| >0.5 (Biomass combustion) | |||||||||
| BaA/(BaA + CHR) | <0.2 (Petroleum) | 0.68 | 0.68 | 0.67 | 0.69 | 0.17 | 0.07 | 0.28 | 0.30 |
| >0.35 (Combustion) | |||||||||
| IcdP/(IcdP + BghiP) | <0.2 (Petroleum) | - | - | - | - | 0.38 | 0.59 | 0.72 | 0.73 |
| 0.2–0.5 (Liquid fossil fuel combustion) | |||||||||
| >0.5 (Biomass combustion) | |||||||||
a Adapted from Yunker et al. [40]; - One or two compounds were not detected.