Solution chemistry study of radioactive Sr on Fukushima Daiichi NPS site

Akira Kirishima, Takayuki Sasaki, Nobuaki Sato

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


For the better understanding of chemical behavior of Sr-90 released from the damaged reactor cores of Fukushima Daiichi nuclear power station into the seawater system, the dissolution behavior of Sr(II) to the mixed seawater was experimentally investigated by the solubility measurement of Sr(II) under several solution conditions (mixing degree of seawater, pH, strontium concentration and temperature) and the microscopic analysis of the formed solid phase. The obtained results of the experiment were compared with thermodynamic equilibrium calculations for an interpretation of chemistry of Sr(II) in the targeted solution system. It was revealed that the Sr solubility became higher than the reported value in generic seawater system, while the solubility limiting solid was identified as SrSO4 which corresponded with the result of equilibrium calculation. Furthermore, under the unsaturated condition, about 6% of Sr(II) interacted with natural nano-size colloids existing in the Fukushima seawater and was captured by 3 kDa filter.

Original languageEnglish
Pages (from-to)152-161
Number of pages10
JournalJournal of Nuclear Science and Technology
Issue number2
Publication statusPublished - 2015 Feb 1


  • contaminated water
  • Fukushima Daiichi NPS
  • phase analysis
  • seawater
  • solubility
  • solution chemistry
  • speciation
  • Sr-90
  • strontium
  • thermodynamics


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