| Fe (mg/L) | Ni (mg/L) | Zn (mg/L) |
Food waste | 0.93 ± 0.02 | 1.17 ± 0.04 | 0.24 ± 0.02 |
Kplala | 1.16 ± 0.02 | 1.94 ± 0.03 | 0.54 ± 0.03 |
Waste of tuna | 1.12 ± 0.03 | 1.57 ± 0.07 | 0.01 ± 0.01 |