An Experimental Approach on the Effect of Rock Alteration on Sorption Behavior
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An Experimental Approach on the Effect of Rock Alteration on Sorption Behavior Yuichi Niibori1, Yasunori Kasuga1, Hiroaki Yoshikawa1, Kouichi Tanaka1, Osamu Tochiyama2 and Hitoshi Mimura1 1 Dept of Quantum Science and Energy Engineering, Tohoku University, Aoba-ku, Sendai, 980-8589 Japan 2 Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Aoba-ku, Sendai, 980-8577 Japan ABSTRACT In the geological disposal of radioactive wastes, cement used for the repository construction alters the condition of groundwater to highly alkaline of pH about 13. Such alkaline groundwater around the repository would alter the surfaces of the rocks in the flow paths to the amorphous phase. Once the surface is altered, it takes a geological period (so much long time) to restore the surface to its former condition. This study examined the sorption behavior of europium (Eu-152 (tracer), Eu-151 (5x10-5 M, carrier) onto some silica minerals with polymeric silicic acid. Polymeric silicic acid also affects the alteration of the solid surface. The results showed that the kinds of silica minerals strongly affect the sorption behavior in the range of 5
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