CESIUM SORPTION TO PADDY SOIL IN FUKUSHIMA

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  • FUJII EIKO
    Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo
  • TAMURA KENJI
    Environmental Remediation Materials Unit, National Institute for Materials Science (NIMS)
  • HATTA TAMAO
    Japan International Research Center for Agricultural Sciences (JIRCUS)
  • YAMADA HIROHISA
    Environmental Remediation Materials Unit, National Institute for Materials Science (NIMS)
  • YAITA TSUYOSHI
    Energy and Environment Materials Science Division, Quantum Beam Science Center, Japan Atomic Energy Agency (JAEA)
  • KOGURE TOSHIHIRO
    Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo

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Abstract

Cesium (Cs) sorption experiments were conducted using the soil of a paddy field in Fukushima, Japan, to find Cs-sorbing materials in the actual soil. The soil particles were reacted with a CsCl solution for one day, which formed a Cs concentration in the soil particles of around 150 ppm. The Cs-sorbed particles were molded into the form of a disk and Cs distribution on the disk surface was acquired using electron-probe X-ray microanalysis. The Cs-concentrated regions on the disk were further confirmed using scanning electron microscopy, and thin film specimens for transmission electron microscopy (TEM) were prepared using a focused-ion-beam instrument. TEM with X-ray microanalysis revealed that the major Cs-sorbing materials were biotite-vermiculite (B-V) mixed-layer mineral and aluminous smectite containing considerable amounts of iron. The B-V mixed layer mineral incorporated cesium ions at the interlayer regions which were probably originally hydrated ones. The structure and Cs-adsorption/desorption properties of the smectite should be investigated in future.

Journal

  • Clay Science

    Clay Science 19 (1), 17-22, 2015

    The Clay Science Society of Japan

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