Heavy metal (µg/g) | Samples from the South Eastern region | Samples from the North Central region | F test p value | [28] STD |
Pb | 0.40 ± 0.05 | 0.31 ± 0.02 | 0.02 | 0.5 |
Cd | 0.05 ± 0.01 | 0.0 ± 0.00 | 0.01 | 0.02 |
Cu | 0.62 ± 0.08 | 0.96 ± 0.05 | 0.01 | 2.00 |