Sorption behavior of uranium(VI) on a biotite mineral
- Kyushu Univ., Fukuoka (Japan). Dept. of Nuclear Engineering
Biotite has the most important role for the sorption of radionuclides in granitic rocks. Experiments on the sorption of uranium(VI) on biotite were conducted to understand the fundamental controls on uranium sorption on biotite mineral, including the effects of pH and uranium concentration in solution. Biotite powder (mesh 32--60) were washed with 1N HCl for a week and were rinsed twice with deionized water for a week. This HCl treatment was necessary to avoid the effects by other minerals. The agreement between surface adsorption coefficient, Ka, of both biotites with and without HCl treatment was within one order of magnitude. The peak Ka value was in the range of 0.1 to 0.01 cm{sup 3}/cm{sup 2} around pH 6. A comparison of aqueous uranium speciations and sorption results indicates that neutral uranyl hydroxide could be an important species sorbed on the biotite. Sequential desorption experiments with KCl and HCl solutions were also carried out after sorption experiments to investigate sorption forms of uranium. Approximately 20% of uranium in solution were sorbed on the biotite as an exchangeable ion. The fraction of exchangeable uranium had a little dependence on pH. The other uranium could not be extracted even by 6N HCl solution. It is possible that most of the uranium could be precipitated as U(IV) via Fe(II) reduction on the biotite surface.
- OSTI ID:
- 382875
- Report Number(s):
- CONF-941075-; ISBN 1-55899-253-7; TRN: 96:025767
- Resource Relation:
- Conference: 18. international symposium on the scientific basis for nuclear waste management, Kyoto (Japan), 23-27 Oct 1994; Other Information: PBD: 1995; Related Information: Is Part Of Scientific basis for nuclear waste management 18. Part 2; Murakami, Takashi [ed.] [Ehime Univ., Matsuyama, Ehime (Japan). Dept. of Earth Sciences]; Ewing, R.C. [ed.] [Univ. of New Mexico, Albuquerque, NM (United States). Dept. of Earth and Planetary Sciences]; PB: 690 p.; Materials Research Society symposium proceedings, Volume 353
- Country of Publication:
- United States
- Language:
- English
Similar Records
Sorption of uranium and radium by biotite, muscovite, and phlogopite
Experimental study of uranium(6+) sorption of the zeolite mineral clinoptilolite
Related Subjects
BIOTITE
SORPTIVE PROPERTIES
URANIUM
ADSORPTION
DESORPTION
PH VALUE
SAMPLE PREPARATION
URANYL COMPOUNDS
HYDROXIDES
POTASSIUM CHLORIDES
PHASE STUDIES
HIGH-LEVEL RADIOACTIVE WASTES
RADIOACTIVE WASTE DISPOSAL
UNDERGROUND DISPOSAL
RADIONUCLIDE MIGRATION
RADIOACTIVE WASTE FACILITIES
EXPERIMENTAL DATA