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| Ion | Added salt | Ratio [coexisting ion]/[metal ion] | Recovery (%) | ||||
|---|---|---|---|---|---|---|---|
| Cr | Ni | Cu | Cd | Pb | |||
| Na+ | Na2CO3 | 500 | 67.7 | 97.0 | 103.3 | 98.8 | 65.0 |
| K+ | KCl | 500 | 54.7 | 75.8 | 78.0 | 73.3 | 58.5 |
| Ca2+ | CaCl2 | 500 | 58.1 | 71.5 | 73.4 | 100.2 | 65.5 |
| Mg2+ | MgSO4 | 500 | 81.5 | 96.6 | 99.6 | 93.6 | 68.9 |
| Cl− | KCl | 450 | 54.7 | 75.8 | 78.0 | 73.3 | 58.5 |
| SO42− | MgSO4 | 2000 | 81.5 | 96.6 | 99.6 | 93.6 | 68.9 |
| CO32− | Na2CO3 | 650 | 67.7 | 97.0 | 103.3 | 98.8 | 65.0 |
