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Local structure of strontium adsorbed on 2:1 clay minerals and its comparison with cesium by XAFS in terms of migration of their radioisotopes in the environment

Abstract

This study aimed to reveal local structures of strontium (Sr) and cesium (Cs) adsorbed on clay minerals (vermiculite and montmorillonite), which suggests stabilities of the adsorbed species of 90Sr and 137Cs in the environment. Adsorption experiments to determine solid-water distribution, XRD for interlayer distances of the clay minerals, and EXAFS for speciation of Sr and Cs were conducted. They showed that Sr and Cs formed outer- and inner-sphere complexes, respectively, in the interlayer, which explains the different degree of mobility of 90Sr and 137Cs in the environment and indicates larger contribution of electrostatic effect for Sr2+ than for Cs+.

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Acknowledgements

This work was supported by the Reimei Research Promotion project (Japan Atomic Energy Agency) and JSPS KAKENHI Grant Numbers 17H04582, 16H04073, 16K13911, 16K12627, 15H02149, and 17H06458. This work has been performed with the approval of SPring-8/JASRI (Proposal Nos. 2015A0118, 2015B0118, and 2016A0118) and KEK (Proposal No. 2014G058). AY conducted experiments and wrote the manuscript. MT, YK, and YT discussed the results and contributed to the writing of the manuscript.

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Correspondence to Akiko Yamaguchi or Yoshio Takahashi.

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Yamaguchi, A., Tanaka, M., Kurihara, Y. et al. Local structure of strontium adsorbed on 2:1 clay minerals and its comparison with cesium by XAFS in terms of migration of their radioisotopes in the environment. J Radioanal Nucl Chem 317, 545–551 (2018). https://doi.org/10.1007/s10967-018-5895-0

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  • DOI: https://doi.org/10.1007/s10967-018-5895-0

Keywords

  • Strontium
  • Cesium
  • Adsorption structure
  • EXAFS
  • Surface complex
  • Migration