| Heavy Metal | Concentration (mg/kg) | Maximum Allowable Limit (mg/kg) |
| Copper | 4.85 - 17,078 | 100 (WHO) - 50 (EC) |
| Zinc | 8.84 - 12,852 | 300 (WHO) - 50 (EC) |
| Lead | 7.51 - 6474 | 85 (WHO) - 50 (EC) |
| Nickel | 10.2 - 40.9 | 50 (WHO) - 20 (EC) |
| Chromium | 0.22 - 36.8 | 100 (WHO) - 50 (EC) |
| Cadmium | 1.01 - 16.1 | 3 (WHO) - 5 (EC) |