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Reversibility and Linearity of Sorption for Some Cations onto a Bulguksa Granite

Chung-Kyun Park^† Pil-Soo Hahn

Radioactive-waste Disposal Research Team, Korea Atomic Energy Research Institute, USA

ckpark@nanum.kaeri.re.kr

Korean Journal of Chemical Engineering, November 1999, 16(6), 758-763(6), 10.1007/BF02698348

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Abstract

Sorption experiments for Co-60, Sr-85, and Cs-137 Onto a Bulguksa granite were carried out to investigate the migration mobility. Reversibility and Linearity of sorption as well as sorption mechanism were examined. Sorption isotherms were fitted in the range of 10(-3) M and 10(-11) M and the applicability of the two isotherm equations, Langmuir and Freundlich, was examined. Sr-85 give rise to almost linear isotherms, while Co-60 and Cs-137 show nonlinear behavior. In order to distinguish sorption types of the cations, a sequential chemical extraction was introduced. The sorbed cations were extracted by applying different solutions of synthetic groundwater CaCl2, KCl, and KTOX(K2C2O4+NH2OH-HCl). Sorption types considered are reversible sorption under a groundwater condition, ion exchange, association with ferro-manganese oxides, and irreversible fixation.

Keywords

Sorption Reversibility Sorption Linearity Sorption Isotherm Sequential Chemical Extraction Surface Complexation Model

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