| Metal | EDTA | EDDS | Hacac | CA | ||||
| loading (mg∙kg−1) | mg∙kg−1 leached | % efficiency | mg∙kg−1 leached | % efficiency | mg∙kg−1 leached | % efficiency | mg∙kg−1 leached | % efficiency |
| Cd (50) | 24.1 | 48.2 | 21.5 | 43.0 | 10.7 | 21.4 | 16.2 | 32.4 |
| Cu (550) | 104.5 | 19.2 | 105.9 | 19.3 | 157.7 | 28.7 | 84.6 | 15.4 |
| Ni (650) | 175.7 | 27.0 | 183.3 | 28.2 | 198.2 | 30.5 | 145.7 | 22.4 |
| Pb (1590) | 390.4 | 24.6 | 155.3 | 9.8 | 81.0 | 5.1 | 274.6 | 17.3 |
| Zn (2160) | 158.2 | 7.3 | 155.7 | 7.2 | 119.5 | 5.5 | 127.8 | 5.9 |