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Environmental Engineering Research 2004;9(4): 160-167. DOI: https://doi.org/10.4491/eer.2004.9.4.160
Min-Hoon Baik, Won-Jin Cho, and Pil-Soo Hahn
Korea Atomic Energy Research Institute, Dukjin-Dong 150, Yuseong-Gu, Daejeon 305-353, Korea
Corresponding Author: Min-Hoon Baik ,Tel: +82-42-868-2089, Fax: +82-42-868-8850, Email: mhbaik@kaeri.re.kr
Received: May 13, 2004;  Accepted: July 13, 2004.
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An experimental study on the sorption of Eu(lll) onto granite was performed as a function of pH in order to investigate the effects of speciation and carbonate on the sorption using a batch procedure. The distribution of Eu(IlI) species was also calculated both in the aerobic and anaerobic conditions as a function of pH. The sorption of Eu(III) onto granite particles was found to be greatly dependent upon the pH regardless of the atmosphere conditions. The distribution coefficient Kj of Eu(III) for granite was about 2-1000 mL/g in the aerobic condition and 2-1500 mL/g in the anaerobic condition depending on the pH. In the aerobic condition, the sorption of Eu(lU) onto granite above pH 8.5 was decreased and this decreased sorption may be due to the formation of anionic ternary' Eu([Il)-hydroxyl-carbonate complexes in the solution. However, in spite of the formation of the anionic ternary complexes, the sorption of Eu(lII) onto granite was not significantly decreased. Therefore, the effect of carbonate on the sorption of Eu(IH) onto granite was considered to be insignificant although the speciation of Eu(lll) in the solution was greatly affected by the presence of carbonates.
Keywords: europium(lll) | sorption | speciation | precipitation | carbonate complexes
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