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Distribution coefficients, KD, of Cr(III)-species (Cr3+, CrCl2+, CrCl2+) and some common cations in rock sample matrices (Na+, Mg2+, Ni2+) for an AG50w-x8 cation exchanger.
| HNO3 [M] |
HCl [M] | |||||
|---|---|---|---|---|---|---|
| Specie | 0.5 | 1.0 | 2.0 | 3.0 | 4.0 | 0.5 |
| CrCl2+ | 1.7 | 1.6 | 1.3 | – | – | 2.1 |
| CrCl2+ | 29.2 | 8.9 | 3.7 | 2.8 | 2.2 | 23.8 |
| Cr3+ | – | – | 25.1 | 10.8 | 5.6 | – |
| Na+ | 14.4 | 7.6 | 4.1 | 3.1 | 2.4 | 14.1 |
| Mg2+ | – | 31.7 | 9.6 | 6.1 | 4.3 | 85.5 |
| Ni2+ | – | 36.3 | 10.3 | 6.3 | 4.0 | – |
