Ion-sieve properties of an inorganic gel loaded with some complex cations of cobalt(III). A radiochemical study

Distribution coefficients of a number of uni-, di-, tri- and quadrivalent metal ions have been determined on chromium ferrocyanide gel loaded with [Co(NH3)6]3+ and [Co(en)3]3+ ions at 25 deg C, and the observed Ksub(d) values are compared with those obtained on the unloaded exchanger in H-form. The gel is found to develop ion-sieve properties after being loaded with the complex cations. The variation in Ksub(d) values with the pH of Rb+, Cs+, Tl+ and Ag+ solutions has also been studied to understand the mechanism of their uptake. The applied radioisotopes were 86Rb, 134Cs, 204Tl, sup(110m)Ag, sup(85+89)Sr, 58Co, sup(115m)Cd, 54Mn, 65Zn and 51Cr with 5-10 mμCi/ml activity. (author)