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| Cation | Cd–SIP | Pb–SIP | Cu(ii)–SIP | Zn(ii)–SIP | ||||
|---|---|---|---|---|---|---|---|---|
| K d (L g−1) | k | K d (L g−1) | k | K d (L g−1) | k | K d (L g−1) | k | |
| Cd(ii) | 4.88 | — | 0.30 | 16.8 | 0.08 | 59.9 | 0.12 | 38.0 |
| Pb(ii) | 0.17 | 29.3 | 5.09 | — | 0.12 | 39.5 | 0.17 | 28.2 |
| Cu(ii) | 0.21 | 81.3 | 23.2 | 19.8 | 4.89 | — | 0.30 | 15.6 |
| Zn(ii) | 0.35 | 14.0 | 0.26 | 19.8 | 0.26 | 19.2 | 4.70 | — |
