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http://dx.doi.org/10.7733/jnfcwt.2020.18.1.73

Sorption Characteristics of Strontium and Nickel on Mackinawite According to pH Variations in Alkaline Conditions  

Park, Chung-Kyun (Korea Atomic Energy Research Institute)
Park, Tae-Jin (Korea Atomic Energy Research Institute)
Lee, Seung-Yup (Korea Atomic Energy Research Institute)
Lee, Jae-Kwang (Korea Atomic Energy Research Institute)
Publication Information
Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT) / v.18, no.1, 2020 , pp. 73-81 More about this Journal
Abstract
Strontium (90Sr) and nickel (59Ni) have been considered as key radionuclides in the safety assessment of radioactive waste disposal. Through various efforts to impede the migration of radioactive nuclides underground, it has been established that some minerals generated from the corrosion of the waste containers have a positive chemical interaction with these radionuclides. Among these minerals we selected mackinawite (FeS), an iron and sulfur compound, and performed a sorption experiment for the Sr and Ni in FeS under anoxic and alkaline conditions by reflecting deep underground environments. The effects of pH on sorption were likewise investigated in the pH range of 8 ~ 12. As a result, it was found that strontium failed to exhibit a good sorption capacity in a weak alkaline range, while nickel showed a noticeably higher sorption affinity over the entire experimental pH range. Moreover, we determined that as the pH increased in the solution, the distribution coefficients (Kd) were increased for both nuclides, which reflects when an alkalinity increses, the surface of the mineral charges much negatively by detaching the hydrogen or cations on the mineral surface. Thus, it can be concluded that the cationic nuclides of Sr and Ni can attach easily to the mineral under strong alkalinity.
Keywords
Strontium; Nickel; Sorption; Mackinawite; pH dependancy; Chemical extraction;
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