Sorption and Migration of Radioiodine in Saturated Sandy Soil

Kenzo Nishimaki, Naoya Satta, Morihiro Maeda

Research output: Contribution to journalArticlepeer-review


Using 126I as tracer, the migration of iodide and iodate in a solvent flowing steadily through saturated sandy soil was examined in column experiment and analyzed theoretically, with particular reference to the effect of differences in pH value. Runs at pH 3, medial pH and pH 10 were performed to determine breakthrough data from radioactivity measurements on the effluent solution. The results obtained from column experiments indicated that, for the same pH, sandy soil sorbed iodate (125IO3-) more strongly than iodide (125I-), and that, for the same chemical form, more effective sorption is shown at lower than at high pH. This indicated that the sorption behavior of iodine in sandy soil depended significantly on their chemical form and on pH-i.e. the hydrogen ion concentration in the influent solution. The strong sorption of iodate under medial pH and pH 3-evidenced by the breakthrough data-was simulated numerically, based on mathematical expressions representing a combination of instantaneous (equilibrium) and limited-rate (non-equiiibrium) sorption processes. Unknown parameters incorporated in the model were determined by a procedure of fitting the mathematically derived curves to the observed plots for different experimental conditions, as a result of which good agreement was obtained of the calculated curves with the observed breakthrough plots.

Original languageEnglish
Pages (from-to)828-838
Number of pages11
JournalJournal of Nuclear Science and Technology
Issue number8
Publication statusPublished - Jan 1 1994
Externally publishedYes


  • column experiments
  • concentration dependence
  • equilibrium model
  • iodates
  • iodides
  • iodine 125
  • nonequilibrium model
  • numerical simulations
  • pH value
  • radionuclide migration
  • sandy soils
  • sorption
  • tailing

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering


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