| Heavy Metal | SBS3 | SBS6 | SBS7 | SBS8 |
| Copper | 10.69 | 1.00 | 1.62 | 6.03 |
| Zinc | 3.92 | 1.84 | 2.26 | 3.29 |
| Iron | 1.54 | 1.03 | 0.98 | 0.93 |
| Manganese | 1.21 | 1.17 | 1.03 | 1.05 |
| Nickel | 0.61 | 0.93 | 1.44 | 2.62 |
| Lead | 17.95 | 4.21 | 4.42 | 9.67 |
| Cadmium | 21.27 | 0.83 | 0.92 | 0.94 |
| Chromium | 1.41 | 1.25 | 1.07 | 1.21 |