Table 3 Desorption of metal ions (III) with different reagents after their adsorption with the Dowex 50WX8 resin at v/m = 0.05 at 25 ± 1 °C
Stripping agent, M | Dy(III) | Pr(III) | Y(III) | S-ratio | ||
|---|---|---|---|---|---|---|
Dy/Pr | Y/Pr | Dy/Y | ||||
HNO3, 1.0Â M | 24.9 | 23.7 | 28 | 1.05 | 1.2 | 1 |
HNO3, 5.0Â M | 55.4 | 12 | 43 | 4.6 | 3.6 | 1.2 |
HCl, 1.0 M | – | – | 7.72 | – | – | – |
H2SO4, 1.0 M | 32.9 | 32.6 | 31 | 1 | – | 1.05 |
Na2CO3, 1.0 M | 21 | 25.9 | 20 | – | – | 1 |
(NH4)2CO3, 1.0 M | 35 | – | 56 | 35 | 56 | – |
Citric acid (1.0Â M) | ||||||
 pH 1 | – | – | – | – |  | – |
 pH 3 | 40.12 | 58.37 | 39.25 | – |  | 1 |
 pH 5 | 18.11 | 35.26 | 20.46 | – |  | – |