Iodine Immobilization by Sodalite Waste Form


Leachabilities and solubilities of the synthesized iodide sodalite and natural (chloride) sodalite were measured by leach test. The iodide sodalite was synthesized in nitrogen gas flow at 800°C for 2 hours. The crystalline structure of the product was certified by XRD analysis. The natural sodalite containing chlorine was obtained at Bancroft, Canada. The several types of solution were used to evaluate the influence of the solubility of sodalite that included the varied pH and the chemical compositions.

The solubilities of chloride sodalite were calculated by the thermodynamics data. The solubility measured for the synthesized iodide sodalite was compared with that calculated. The solubility of the synthesized iodide sodalite was approximately 2 x 10-4 mol/L, which shows a good agreement with the calculated one of the natural sodalite.

This is a preview of subscription content, access via your institution.


  1. 1.

    W.I. Winters, “The Effect of Hot-Pressing Conditions on the Properties of Iodide Sodalite”, RHO-LD-153, 1980

    Google Scholar 

  2. 2.

    E.R. Vance, D.K. Agrawal et al., “Ceramic Phase for Immobilization of I-129”, DOE/ET/41900-9, 1981

    Google Scholar 

  3. 3.

    C. Pereira, “Production of Sodalite Waste Forms by Addition of Glass”, ANL/CMT/CP-84675, 1995

    Google Scholar 

  4. 4.

    T. Koyama, C. Seto, T. Yoshida, F. Kawamura, and H. Tanaka, “Immobilization of Halide Salt Waste from Pyrochemical Reprocessing by Forming Natural Occurring Mineral; SODALITE”, International Conference on Evaluation of Emerging Nuclear Fuel Cycle Systems, Global ’95, pp. 1744–1751, 1995

    Google Scholar 

  5. 5.

    T. Nakazawa, H. Kato, T. Takase, S. Ueta, “Immobilization of Iodine by Sodalite Waste Form”, J.Nuclear Fuel Cycle and Environment, Vol. 6, No.1, Dec 1999 (in Japanese)

    Google Scholar 

  6. 6.

    D.L. Parkhurst, D.C. Thorstenson and L.N. Plummer, PHREEQE. A Computer program for Geochemical Calculations., U.S.GEOLGICAL SURVEY, Water-Resource Investigations, 80-96, 1980

    Google Scholar 

  7. 7.

    N. Komada, E.F. Westrum Jr, B.S. Hemingway, M.Y. Zolotov, Y.V. Semenov, and L.M. Anovitz, “ Thermodynamic Properties of Sodalite at Temperatures from 15K to 1000K”, J.Chem.Thermodynamics, 27, pp. 1119–1132, 1995

    CAS  Article  Google Scholar 

  8. 8.

    Thermodynamic Table for Nuclear Waste Isolation, NUREG/CR-4865

Download references

Author information



Corresponding author

Correspondence to T. Nakazawa.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Nakazawa, T., Kato, H., Okada, K. et al. Iodine Immobilization by Sodalite Waste Form. MRS Online Proceedings Library 663, 51 (2000).

Download citation