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Salinity dependence of 226Ra adsorption on montmorillonite and kaolinite

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Abstract

The effect of NaCl concentration (10.0–1,000 mM) on 226Ra adsorption was investigated in the presence of montmorillonite and kaolinite. A positive correlation was observed between the dissolved 226Ra and NaCl concentrations in the presence of these adsorbents. Distribution coefficients decreased from the order of 104 to 100 (mL g−1) with an increase in NaCl concentration. Although the coefficients were higher for montmorillonite than kaolinite at lower NaCl concentrations, the trend was reversed at higher NaCl concentrations (≥500 mM) owing to the sharper reduction of the coefficient for montmorillonite with the increase in NaCl concentration. The rapid reduction was ascribed to higher negative charge density of montmorillonite, which leads the Ra2+ adsorption mechanism to approach charge-compensating ion exchange.

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Acknowledgments

We thank M. Fuchizaki, Kanazawa University, for the XRD spectral measurements. T. Murakami, Kanazawa University, is acknowledged for valuable comments in the interpretation of the experimental results.

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Author notes

  1. Shuji Tamamura

    Present address: Horonobe Research Institute for the Subsurface Environment, 5-3 Sakae-machi, Horonobe-cho, Teshio-gun, Hokkaido, 098-3221, Japan

  2. Junpei Tomita

    Present address: Japan Atomic Energy Agency, 2-4 Shirane, Shirakata, Tokai-mura, Naka-gun, Ibaraki, 319-1195, Japan

Authors and Affiliations

  1. Low Level Radioactivity Laboratory, INET, Kanazawa University, O24, Wake, Nomi, Ishikawa, 923-1224, Japan

    Shuji Tamamura, Takahiro Takada, Junpei Tomita, Seiya Nagao & Masayoshi Yamamoto

  2. Institute of Nature and Environmental Technology, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa, 920-1192, Japan

    Keisuke Fukushi

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  1. Shuji Tamamura
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  2. Takahiro Takada
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Correspondence to Shuji Tamamura.

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Tamamura, S., Takada, T., Tomita, J. et al. Salinity dependence of 226Ra adsorption on montmorillonite and kaolinite. J Radioanal Nucl Chem 299, 569–575 (2014). https://doi.org/10.1007/s10967-013-2740-3

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  • DOI: https://doi.org/10.1007/s10967-013-2740-3

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