著者

Furuya H. Idemitsu K. Inagaki Y. Arima T. Sasaki T. Kuroda Y. Uchikawa S. Mitsugashira S. Suzuki Y.

出版者

東北大学

雑誌

Science reports of the Research Institutes, Tohoku University. Ser. A, Physics, chemistry and metallurgy (ISSN:00408808)

巻号頁・発行日

vol.45, no.1, pp.89-91, 1997-03-28

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It is necessary to obtain the data of some parameters concerning migration behavior of radionuclides in underground water for the safety assessment of radioactive waste disposal. Sorption and desorption experiments were carried out by using tracer amount of plutonium on biotite in a granitic rock. In this study, pH dependence of distribution coefficients of plutonium on a biotite mineral were measured. The following results are obtained; (1) The biotite has the pH buffer capacity at around pH 5. (2) Plutonium sorption rate was fast around pH 6 but slow at lower pH than 5. (3) The 95 percent of plutonium was sorbed on biotite at around pH 5. (4) The 10 to 30 percent of sorbed plutonium in biotite was desorbed with 1N KCl, the 50 to 60 percent with 1N HN0_3. (5) The rest of plutonium sorbed in biotite could not be desorbed even with 1N HN0_3. (6) The neutral plutonyl hydroxide could be an important species sorbed on the biotite.sorptionplutoniumbiotite