Table 1. Characteristics of petroleum hydrocarbons (PHs) in soils of the Dagang oilfield.
| Samples | TPH (mg kg−1 dm) | TSH (mg kg−1 dm) | TAH (mg kg−1 dm) | Alkanes (C8 ~ C40)(μg kg−1 dm) | 16 PAHs (μg kg−1 dm) | naphthalene (μg kg−1 dm) | phenanthrene(μg kg−1 dm) | pyrene(μg kg−1 dm) | Alkanes (C8 ~ C19) (μg kg−1 dm) | Alkanes (C20 ~ C32) (μg kg−1 dm) | Alkanes (C33 ~ C40) (μg kg−1 dm) | pH | salinity(g kg−1 dm) | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Oil-producing zone | S1 | (3.7 ± 0.7) × 104 | (1.1 ± 0.2) × 104 | (5.1 ± 0.8) × 103 | (1.9 ± 0.1) × 104 | (1.3 ± 0.05) × 103 | (1.2 ± 0.2) × 102 | 7.7 × 101 | 2.5 × 102 | 7.7 × 103 | 9.8 × 103 | 1.9 × 103 | 8.55 | 16.56 |
| S2 | (3.3 ± 0.7) × 104 | (6.5 ± 0.3) × 103 | (4.9 ± 0.2) × 103 | (1.1 ± 0.1) × 104 | (4.0 ± 0.3) × 102 | (7.9 ± 1.2) × 101 | 7.4 × 101 | 8.2 × 101 | 4.1 × 103 | 7.0 × 103 | 4.0 × 102 | 8.54 | 7.97 | |
| S3 | (2.2 ± 0.6) × 104 | (3.5 ± 0.4) × 103 | (3.4 ± 0.5) × 103 | (6.6 ± 0.2) × 103 | (4.3 ± 0.2) × 102 | (5.9 ± 0.9) × 101 | 8.9 × 101 | 6.9 × 101 | 3.2 × 103 | 3.2 × 103 | 1.0 × 102 | 8.53 | 7.10 | |
| S4 | (2.0 ± 0.5) × 104 | (2.6 ± 0.8) × 103 | (2.6 ± 0.4) × 103 | (1.2 ± 0.1) × 104 | (4.0 ± 0.7) × 102 | (1.2 ± 0.0) × 102 | 8.3 × 101 | 7.0 × 101 | 8.1 × 103 | 3.7 × 103 | 2.0 × 102 | 8.39 | 8.76 | |
| S5 | (2.1 ± 0.2) × 104 | (7.8 ± 0.8) × 103 | (1.7 ± 0.3) × 103 | (1.3 ± 0.1) × 104 | (1.7 ± 0.1) × 102 | (2.7 ± 0.1) × 101 | 3.9 × 101 | 5.1 × 101 | 6.3 × 103 | 6.9 × 103 | 2.2 × 102 | 8.63 | 11.78 | |
| Residential zone | S6 | (1.3 ± 0.3) × 104 | (9.7 ± 0.9) × 102 | (2.2 ± 0.6) × 103 | (2.8 ± 0.2) × 102 | (4.6 ± 0.4) × 102 | (5.8 ± 0.6) × 101 | 7.1 × 101 | 1.0 × 102 | 1.4 × 102 | 1.1 × 102 | 3.4 × 101 | 8.51 | 53.83 |
| S7 | (2.1 ± 0.5) × 104 | (5.4 ± 0.8) × 103 | (1.8 ± 0.4) × 103 | (5.9 ± 0.1) × 103 | (2.7 ± 0.3) × 102 | (4.7 ± 0.9) × 101 | 7.4 × 101 | 3.6 × 101 | 3.6 × 103 | 2.3 × 103 | 6.3 × 101 | 8.43 | 26.72 | |
| S8 | (3.4 ± 0.5) × 104 | (5.2 ± 0.4) × 103 | (1.1 ± 0.5) × 103 | (7.2 ± 0.7) × 103 | (1.9 ± 0.2) × 102 | (3.7 ± 0.2) × 101 | 4.6 × 101 | 2.9 × 101 | 4.4 × 103 | 2.7 × 103 | 7.4 × 101 | 8.56 | 33.23 | |
| S9 | (1.8 ± 0.2) × 104 | (6.0 ± 1.4) × 103 | (1.8 ± 0.3) × 103 | (2.9 ± 0.3) × 103 | (3.7 ± 0.1) × 102 | (1.3 ± 0.1) × 102 | 6.6 × 101 | 6.3 × 101 | 2.0 × 103 | 9.1 × 102 | 5.0 × 101 | 8.44 | 3.32 | |
| Oil-refinery and transportation zone | S10 | (2.3 ± 0.4) × 104 | (9.0 ± 1.3) × 103 | (2.2 ± 0.5) × 103 | (1.8 ± 0.2) × 104 | (3.2 ± 0.3) × 102 | (8.3 ± 0.7) × 101 | 7.6 × 101 | 6.3 × 101 | 9.5 × 103 | 8.6 × 103 | 1.9 × 102 | 8.38 | 4.82 |
| S11 | (2.2 ± 0.1) × 104 | (6.0 ± 0.8) × 103 | (5.4 ± 0.2) × 103 | (1.5 ± 0.4) × 104 | (2.8 ± 0.3) × 103 | (1.3 ± 0.1) × 102 | 2.6 × 102 | 4.4 × 102 | 6.0 × 103 | 8.4 × 103 | 2.8 × 102 | 8.41 | 14.37 | |
| S12 | (2.3 ± 0.2) × 104 | (7.6 ± 0.8) × 103 | (1.8 ± 0.2) × 103 | (1.5 ± 0.04) × 104 | (1.8 ± 0.2) × 102 | (3.7 ± 0.5) × 101 | 3.9 × 101 | 5.3 × 101 | 7.6 × 103 | 7.6 × 103 | 1.3 × 102 | 8.61 | 13.48 | |
| S13 | (2.2 ± 0.3) × 104 | (8.5 ± 0.8) × 103 | (3.4 ± 0.6) × 103 | (1.6 ± 0.1) × 104 | (7.1 ± 0.5) × 102 | (8.8 ± 1.1) × 101 | 1.1 × 102 | 1.1 × 102 | 7.7 × 103 | 8.0 × 103 | 2.2 × 102 | 8.4 | 1.42 | |
| S14 | (2.0 ± 0.5) × 104 | (6.6 ± 0.9) × 103 | (1.9 ± 0.9) × 103 | (1.3 ± 0.1) × 104 | (2.8 ± 0.7) × 102 | (4.0 ± 0.9) × 101 | 5.4 × 101 | 6.2 × 101 | 7.1 × 103 | 6.1 × 103 | 8.8 × 101 | 8.62 | 27.32 | |
Mean ± standard deviation for triplicate experiments.