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Nitrogenous salts (ammonium, nitrite and nitrate) levels in oil-polluted wetland soil
| Level of pollution (%) | NH4 +–N (mg 100 g−1) | NO2–N (mg 100 g−1) | NO3–N (mg 100 g−1) |
|---|---|---|---|
| 0 | 0.8 ± 0.1 | ND | 7.2830 ± 0.002 |
| 0.5 | 0.5 ± 0.2 | ND | 0.4357 ± 0.014 |
| 1 | 0.3 ± 0.1 | ND | 0.3558 ± 0.008 |
| 5 | 0.2 ± 0.1 | ND | 0.2688 ± 0.011 |
| 10 | 0.09 ± 0.02 | ND | 0.1752 ± 0.006 |
| 15 | 0.05 ± 0.02 | ND | 0.1548 ± .0.004 |
| 20 | 0.02 ± 0.01 | ND | 0.1139 ± 0.016 |
ND Not detected
