Table 6.
Oil hydrocarbon concentration in the surface soil and water samples. Water samples could in most cases be obtained either from surface or from the bottom valves depending on whether the formation of gases was lifting the plume. Concentration in mg kg−1 refers to kg of dry weight.
| H2O2 | H2O2 + citrate | H2O2 + citrate+Fe(II) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Treatment/days after treatment | Surface soil | Surface water | Bottom water | t | Surface soil | Surface water | Bottom water | t | Surface soil | Surface water | Bottom water | t |
| mg kg−1 | mg L−1 | mg L−1 | °C | mg kg−1 | mg L−1 | mg L−1 | °C | mg kg−1 | mg L−1 | mg L−1 | °C | |
| 1/0 | 990 ± 70 | … | … | 15 | 960 ± 120 | … | … | 15 | 940 ± 40 | … | … | 17 |
| 1/1 | 590 ± 10 | 76 | … | 35 | 480 ± 80 | 120 | … | 45 | 350 ± 40 | 210 | … | 46 |
| 1/2 | 34 | 27 | 28 | |||||||||
| 1/4 | 450 ± 10 | 210 | … | 18 | 620 ± 50 | 64 | … | 15 | 480 ± 60 | 440 | … | 15 |
| 1/8 | 15 | 12 | 11 | |||||||||
| 1/10 | 14 | 13 | 11 | |||||||||
| 1/14 | 440 ± 80 | … | 0.49 | 14 | 900 ± 50 | … | <0.05 | 13 | 670 ± 80 | … | 1.5 | 13 |
| 2/1 | 530 ± 60 | 120 | … | 21 | 410 ± 40 | 100 | … | 43 | 210 ± 30 | 320 | … | 45 |
| 2/5 | 18 | 15 | 15 | |||||||||
| 2/7 | 790 ± 80 | … | 1.0 | … | 570 ± 20 | … | 0.21 | … | 450 ± 40 | 170 | 1.2 | … |
| 2/14 | 710 ± 50 | … | 0.76 | … | 970 ± 80 | … | 0.10 | … | 360 ± 10 | … | 0.46 | … |