Co | Cd | Lead | Reference | Country |
ND | ND | ND | [18] | Ethiopia |
0.002 | 0.068 | 0.040 | [2] | Egypt |
NR | 0.163 | 0.550 | [3] | Kano (Nigeria) |
NR | 0.099 | 0.710 | [3] | Zaria (Nigeria) |
NR | 1.24 | 3.43 | [19] | Libya |
0.020 | ND | 0.263 | This study | Zanzibar |