| Metal |
Source |
Concentration(mg/l) |
Reference |
| Cadmium |
Nigeria |
ND–0.01 |
[22] |
| |
Italy |
ND –0.00058 |
[5] |
| |
Brazil |
ND –0.0143 |
[23] |
| |
Ethiopia |
ND –0.007 |
Present study |
| Copper |
Nigeria |
0.04–0.10 |
[22] |
| |
Brazil |
0.038–0.155 |
[24] |
| |
Norway |
0.007–0.049 |
[25] |
| |
Ethiopia |
0.012–0.056 |
Present study |
| Lead |
Nigeria |
ND – 0.047 |
[22] |
| |
Italy |
ND –0.0133 |
[5] |
| |
Brazil |
0.013–0.0329 |
[24] |
| |
Ethiopia |
ND –0.03 |
Present study |
| Manganese |
Poland |
0.12–0.24 |
[26] |
| |
Brazil |
0.11–0.348 |
[24] |
| |
Norway |
0.032–0.142 |
[25] |
| |
Ethiopia |
0.042–0.202 |
Present study |
| Zinc |
Nigeria |
0.010– 0.15 |
[22] |
| |
Poland |
0.019–0.037 |
[26] |
| |
Brazil |
0.0527–0.226 |
[24] |
| |
Ethiopia |
0.599–3. 528 |
Present study |
|
