Sorption of uranium on high-FeO olivine rock

In the context of the problem of ensuring the safety of underground nuclear waste repositories, the sorption of uranium on olivine was studied using t he leaching procedure. The long-term olivine/water interaction in the repos itory conditions was simulated using the autoclave technique. Crushed olivi ne samples were immersed in deionized water and brought in contact with U(V I) in titanium autoclaves. Uranium sorption on olivine and its distribution in the sorbent phase were examined using a sequental extraction technique. Uranium is associated with Fe(III)-rich secondary products, passing from l oosely to more strongly bound states with increasing temperature and time.