| Element | Number of references. | Number of data | sorption system | |
| MS | CS | |||
| Cd | 34 | 64 | 10−2 - 106 | 10−2 - 104 |
| Pb | 33 | 56 | 10−2 - 107 | 10−2 - 104 |
| Cu | 33 | 58 | 10−2 - 105 | 10−2 - 105 |
| Zn | 34 | 72 | 10−2 - 106 | 10−2 - 104 |
| As | 19 | 27 | 10−2 - 106 | None |