Journal of Radioanalytical and Nuclear Chemistry

, Volume 299, Issue 1, pp 569–575 | Cite as

Salinity dependence of 226Ra adsorption on montmorillonite and kaolinite

  • Shuji Tamamura
  • Takahiro Takada
  • Junpei Tomita
  • Seiya Nagao
  • Keisuke Fukushi
  • Masayoshi Yamamoto
Article

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.

Keywords

Radium Adsorption Montmorillonite Kaolinite Salinity Distribution coefficient 

Notes

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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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2013

Authors and Affiliations

  • Shuji Tamamura
    • 1
    • 3
  • Takahiro Takada
    • 1
  • Junpei Tomita
    • 1
    • 4
  • Seiya Nagao
    • 1
  • Keisuke Fukushi
    • 2
  • Masayoshi Yamamoto
    • 1
  1. 1.Low Level Radioactivity Laboratory, INETKanazawa UniversityNomiJapan
  2. 2.Institute of Nature and Environmental TechnologyKanazawa UniversityKanazawaJapan
  3. 3.Horonobe Research Institute for the Subsurface EnvironmentTeshio-gunJapan
  4. 4.Japan Atomic Energy AgencyNaka-gunJapan

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