Quarter | Sample code | Cadmium | Lead | Manganese | Nickel |
| mg/kg | ||||
Obi-Iloh | 1 | 14.9 | 153.8 | 483.0 | 24.5 |
| 2 | 4.3 | 88.0 | 333.9 | 17.0 |
| 3 | 2.8 | 44.0 | 283.0 | 26.6 |
| 4 | 2.8 | 109.8 | 447.5 | 24.5 |
| Mean | 6.2 | 98.9 | 386.9 | 23.0 |
Obi-Ogene | 5 | 3.3 | 109.6 | 544.0 | 22.3 |
| 6 | 2.3 | 107.6 | 501.3 | 27.6 |
| 7 | 6.2 | 150.8 | 622.4 | 29.8 |
| 8 | 7.2 | 161.6 | 752.0 | b.d |
| Mean | 4.8 | 132.4 | 604.9 | 19.9 |
Adonishaka | 9 | 5.6 | 140.0 | 617.2 | 1.1 |
| 10 | 6.2 | 53.8 | 361.3 | 23.4 |
| 11 | 4.0 | 55.5 | 271.5 | 24.6 |
| 12 | 5.0 | 66.6 | 376.9 | 19.1 |
| Mean | 5.2 | 79.0 | 406.7 | 17.0 |
Ukwuole | 13 | 2.8 | 77.7 | 221.3 | 19.2 |
| 14 | 5.0 | 76.6 | 224.7 | 19.1 |
| 15 | 2.8 | 66.6 | 356.1 | 22.3 |
| 16 | 1.2 | 96.9 | 328.7 | 25.6 |
| Mean | 3.0 | 79.5 | 282.7 | 21.6 |
Reference (DPR, 2002) | 0.8 | 85.0 | 850.0 | 35.0 |