Hostname: page-component-848d4c4894-pjpqr Total loading time: 0 Render date: 2024-06-23T21:51:29.340Z Has data issue: false hasContentIssue false
  • English
  • Français

Quantification of Exchangeable Cations in Interlayer of Tsukinuno Sodium-Montmorillonite

Published online by Cambridge University Press:  15 February 2011

Haruo Sato
Haruo Sato*
Affiliation:
Japan Atomic Energy Agency, 432-2 Hokushin, Horonobe-cho, Hokkaido 098-3224, Japan
Get access

Abstract

In this study, the cation exchange capacity (CEC) and leached exchangeable cations (LC) of montmorillonite purified from bentonite produced in the Tsukinuno bentonite mine, Yamagata, Japan, were measured, and the exchangeable cations in the interlayer of the montmorillonite were discussed. A montmorillonite, in which the soluble minerals were completely removed, was prepared. Kunipia-F and Kunipia-P, for which both bentonites originally contain approximately 100 wt.% montmorillonite, were used as the initial material. All of the measurements were carried out in a N2 atmosphere-controlled glove-box.

The CEC values of montmorillonites for both bentonites (100-110 meq/100g) were similar to data conventionally reported, and the sum of LC was also approximately in good agreement with the CEC values. The share of Na+ in the interlayer of montmorillonite calculated from the LC was about 3/4 of the sum of the LC (≍ CEC), and Mg2+ and Ca2+ occupied about 7 and 19 %, respectively. Although montmorillonite in bentonite produced in the Tsukinuno bentonite mine is known as a Na type, the sum of Ca2+ and Mg2+ occupied about 26 % of all exchangeable cations in the interlayer. Based on these data, the ion exchange reaction constant between Na+ and H+ in the interlayer of montmorillonite was calculated to be -0.07. This is nearly 2 orders of magnitude lower than data that are usually adopted.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1193: Scientific Basis for Nuclear Waste Management XXXIII , 2009 , 529
Copyright
Copyright © Materials Research Society 2009

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1 Suzuki, H., Shibata, M., Yamagata, J., Hirose, I., and Terakado, K., PNC Tech. Rep., PNC TN8410 92-057 (1992).Google Scholar
2 Ito, M., Okamoto, M., Shibata, M., Sasaki, Y., Danbara, T., Suzuki, K., and Watanabe, T., PNC Tech. Rep., PNC TN8430 93-003 (1993).Google Scholar
3 Ito, M., Okamoto, M., Shibata, M., and Sasaki, Y., J. Atom. Ener. Soc. Japan, 36 (1), 1055 (1994).Google Scholar
4 Suzuki, K., Takagi, S., Sato, T., and Yoneda, T., Nendokagaku, 46 (3), 147 (2007).Google Scholar
5 Suzuki, K., Enoto, H., and Ito, H., Nendokagaku, 45 (1), 14 (2005).Google Scholar
6 Shibutani, T., Kohara, Y., Oda, C., Kubota, M., Kuno, Y., and Shibata, M., JNC Tech. Rep., JNC TN8400 99-066 (1999).Google Scholar
7 Wada, S., Kasagi, S., Ootani, T., and Fujiwara, Y., in abstract of 51th Annual Meeting of the Clay Sci. Soc. of Japan, Sep. 12-14, 2007, Hokkaido Univ., A3 (2007).Google Scholar
8 Brookins, D. G., Eh-pH Diagrams for Geochemistry (Springer-Verlag, Berlin, Heidelberg, 1988).Google Scholar
9 Nihon-Kagakukai, (Chemical Society of Japan) ed., Kagaku-Binran, , Kisohen, II (Handbook of Chemistry, Basic version II), 2nd ed. (Maruzen, Tokyo, 1975).Google Scholar
10 Sasaki, Y., Shibata, M., Yui, M., and Ishikawa, H., in Scientific Basis for Nucl. Waste Manag. XVIII, edited by Murakami, T. and Ewing, R. C., (Mater. Res. Soc. Symp. Proc., 353, Pittsburgh, PA, 1995), pp.337–344.Google Scholar