Elements | Gade | Tobéne | Darou Khoudoss | Maximum allowable level in soil (mg/kg) WHO 1996 |
As (mg/kg) | 0.28 | 0.38 | 0.21 | <20 |
Cd (mg/kg) | 0.88 | 0.88 | 0.83 | <0.8 |
Cr (mg/kg) | 1.10 | 1.44 | 1.27 | <100 |
Cu (mg/ml) | 2.29 | 1.95 | 2.12 | <36 |
Hg (mg/kg) | 0.80 | 0.86 | 0.73 | <1.9 |
Pb (mg/kg) | 0.24 | 0.28 | 0.27 | <100 |
Zn (mg/kg) | 4.15 | 3.73 | 3.90 | <50 |
Soufre (mg/kg) | | | | - |
Phosphate (mg/kg) | 2211.00 | 542.00 | 375.00 | 500 - 800 mg/kg |