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Report No.
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The Study on the Characterization of Colloids in Groundwater(II)

Kuno, Yoshio*; Ueda, Shinzo*

Groundwater colloids may act as carriers for sorbing radionuclides released from a radioactive waste repository. To evaluate the influence of colloids to nuclide transport, it is necessary to obtain the characteristic data of groundwater colloids (e.g. colloid concentration, the distribution coefficient for sorption of nuclides on colloids) in the deep geological media and to prepare the simulation code of nuclide transport with colloids. In this study, the groundwater sample was collected from the gallery of the mine in crystalline rock media to investigate the population of the natural colloids. The concentration, size distribution and chemical compositions of colloids were measured by using filtration method. Colloidal particles consist mainly of silicate minerals and Ca-rich particles. The dissolved organic materials were not detected in the groundwater. The properties of colloids seem to depend on the host rock type and the groundwater chemistry. To simulate the in-situ condition of groundwater, chemical conditions were controlled by varying the partial pressure of CO$$_{2}$$ and the colloid generation in each groundwater was investigated. The numerical model (COLFRAC) is developed in Ohio state university that incorporates the mechanism of colloid-facilitated nuclide transport in fractured porous media. Both equilibrium and kinetic sorption of nuclides onto colloidal materials can be considered in this calculation code. The guidance to learn how to use this code was conducted and the user's manual was prepared.

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