Diffusion behavior for Se and Zr in sodium-bentonite

Haruo Sato, Mikazu Yui, Hideki Yoshikawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

37 Citations (Scopus)

Abstract

Apparent diffusion coefficients for Se and Zr in bentonite were measured by in-diffusion method at room temperature using water-saturated sodium-bentonite. KunigelV1qq* containing 50wt% Na-smectite as a major mineral was used as the bentonite material. The experiments were carried out in the dry density range of 400-1800 kg/m3. Bentonite samples were immersed with distilled water and saturated before the experiments. The experiments for Se were carried out under N2 atmospheric condition (O2: 2.5 ppm). Those for Zr were carried out under aerobic condition. The apparent diffusion coefficients decrease with increasing density of the bentonite. Since dominant species of Se in the pore water is predicted SeO3 2-, Se may be retarded by anion-exclusion because of negative charge on the surface of the bentonite and little sorption. The dominant species of Zr in the porewater is predicted Zr(OH3)5 - or HZrO3 -. Distribution coefficient measured for Zr on the bentonite was about 1.0 m3/kg from batch experiment. Therefore, the retardation may be caused by combination of the sorption and the anion-exclusion. A modelling for the diffusion mechanisms in the bentonite were discussed based on an electric double layer theory. Comparison between the apparent diffusion coefficients predicted by the model and the measured ones shows a good agreement.

Original languageEnglish
Title of host publicationMaterials Research Society Symposium - Proceedings
PublisherMaterials Research Society
Pages269-276
Number of pages8
Volume353
Edition1
Publication statusPublished - 1995
Externally publishedYes
EventProceedings of the 18th International Symposium on the Scientific Basis for Nuclear Waste Management. Part 1 (of 2) - Kyoto, Jpn
Duration: Oct 23 1994Oct 27 1994

Other

OtherProceedings of the 18th International Symposium on the Scientific Basis for Nuclear Waste Management. Part 1 (of 2)
CityKyoto, Jpn
Period10/23/9410/27/94

Fingerprint

Bentonite
Sodium
Anions
Sorption
Water
Negative ions
Experiments
Minerals

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

Cite this

Sato, H., Yui, M., & Yoshikawa, H. (1995). Diffusion behavior for Se and Zr in sodium-bentonite. In Materials Research Society Symposium - Proceedings (1 ed., Vol. 353, pp. 269-276). Materials Research Society.

Diffusion behavior for Se and Zr in sodium-bentonite. / Sato, Haruo; Yui, Mikazu; Yoshikawa, Hideki.

Materials Research Society Symposium - Proceedings. Vol. 353 1. ed. Materials Research Society, 1995. p. 269-276.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Sato, H, Yui, M & Yoshikawa, H 1995, Diffusion behavior for Se and Zr in sodium-bentonite. in Materials Research Society Symposium - Proceedings. 1 edn, vol. 353, Materials Research Society, pp. 269-276, Proceedings of the 18th International Symposium on the Scientific Basis for Nuclear Waste Management. Part 1 (of 2), Kyoto, Jpn, 10/23/94.
Sato H, Yui M, Yoshikawa H. Diffusion behavior for Se and Zr in sodium-bentonite. In Materials Research Society Symposium - Proceedings. 1 ed. Vol. 353. Materials Research Society. 1995. p. 269-276
Sato, Haruo ; Yui, Mikazu ; Yoshikawa, Hideki. / Diffusion behavior for Se and Zr in sodium-bentonite. Materials Research Society Symposium - Proceedings. Vol. 353 1. ed. Materials Research Society, 1995. pp. 269-276
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