Hydrochloric acid was found to be effective among the three desorption solutions, hence GK- U (VI) complex were treated with different concentrations of HCl (0.1 M, 1 M, 3 M). GK-U (VI) complex treated with 0.1 M, 1 M, 3 M HCl showed 74.8%,
85.7% and 100% desorption respectively (Fig. 5b).