Abstract :
Buffer material plays a highly significant role in the conceptual design of engineering barrier systems, which are applied in radwaste disposal. In light of its universal and excellent sorption capabilities for many radionuclides, mordenite is a potential buffer material. Nevertheless, the concentrations of cations presented in groundwater, such as K+, Na+, Ca2+ and Mg2+, may cause competing reactions and influence the sorption behavior of mordenite considerably. The Freundlich sorption isotherm was employed to quantify the influences of various cations on the sorption of Sr2+ in terms of the specific sorption capability, S. For monovalent cations, such as K+ and Na+, S is proportional to ([Sr2+]/[A+]2)n, and for divalent cations, such as Ca2+ and Mg2+, S is proportional to ([Sr2+]/[B2+])n.
