| Metal | Na+ | K+ | Ca2+ | Mg2+ | Total |
| non | 0.01 ± 0.00 | 0 ± 0.00 | 0.01 ± 0.00 | 0.03 ± 0.00 | 0.05 |
| Ni2+ | 0.00 ± 0.00 | 2.46 ± 0.06 | 4.53 ± 0.02 | 3.15 ± 0.02 | 10.14 |
| Cd2+ | 0.01 ± 0.00 | 1.67 ± 0.00 | 3.47 ± 0.04 | 2.49 ± 0.01 | 7.64 |