| Site or Standard | Sample | Fe | Cu | Cd | Pb | Al | Zn | Reference |
| New York | Effluent liquid | 600 | 63 | 0.6 | 5 |
| - | [11] |
| Dar es Salaam (Tanzanie) | - | 10 | 40 | 270 |
| - | [12] | |
| Benin City, Nigeria |
| 194 | 72 | 125 |
| 174 | [13] | |
| USA Standard | 1000 | 50 | 50 | 50 | - | 100 | [14] | |
| SACO | 532.5 | 278.375 | 10.95 | 101.99 | 344.17 | 857.05 | Present study | |
| CIE | 854.5 | 262.075 | 4.81 | 27.75 | 227.72 | 255.9 | ||
| BL | 884.5 | 308.05 | 9.92 | 18.08 | 466.65 | 427 | ||
| SP | 3026 | 2148.5 | 1.08 | 79.92 | 1126.5 | 2146.5 | ||
| ZONE | 2418 | 245.25 | 0.8 | 34.85 | 224.25 | 566.75 | ||
| PHOENIX | 2050 | 1984.5 | 2.03 | 53.75 | 1685.25 | 1282.5 | ||
| AZITO | 1905 | 2157.5 | 2.29 | 61.45 | 1652.5 | 1170 |