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 HNO3. (5) The rest of plutonium sorbed in biotite could not be desorbed even with 1N HNO3. (6) The neutral plutonyl hydroxide could be an important species sorbed on the biotite.
|Number of pages||3|
|Journal||Science Reports of the Rerearch Institutes Tohoku University Series A-Physics|
|Publication status||Published - Mar 1 1997|
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Metals and Alloys