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Effects of ionic strength and humic acid on 99TcO4 − sorption and diffusion in Beishan granite

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Abstract

In terms of pre-safety assessment of a potential site for high-level radioactive wastes disposal in China, the geochemical behavior of key radionuclides which tend to be released from the repository must be thoroughly investigated. 99Tc is a long-lived fission product with appreciable productivity in nuclear fuel, and Tc (+7) has unlimited solubility in near-field geochemical environments. In this study, the effects of ionic strength and humic acid on 99TcO4 − sorption and diffusion in Beishan granite were investigated with through-diffusion and batch sorption experiments. Results indicated that the effective diffusion coefficients (D e) of 99TcO4 − in Beishan granite varied from 1.07 × 10−12 to 1.28 × 10−12 m2/s without change with ionic strength, while the distribution coefficients (K d) negatively correlated with ionic strength of the rock/water system. This study also indicates that there is no evident influence of humic acid concentration on the diffusion behavior of 99TcO4 − in Beishan granite, due to the limited interaction between humic acid and 99TcO4 −.

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Acknowledgments

The project was jointly supported by the National Natural Science Foundation of China (Grant No. 10775008, 11075006, 91026010), Special Foundation for High-level Waste Disposal (2007-840), the Fundamental Research Funds for the Central Universities, Analysis foundation of Peking University (13–18) and the 111 projects, we acknowledge them for their financial supports.

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Authors and Affiliations

  1. Beijing National Laboratory for Molecular Science, Radiochemistry & Radiation Chemistry Key Laboratory for Fundamental Science, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, People’s Republic of China

    C. Li, C. L. Wang, X. Y. Liu, Z. Zheng, L. H. Wang, Q. Q. Zhu, M. L. Kang, T. Chen & C. L. Liu

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  1. C. Li
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  2. C. L. Wang
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Correspondence to C. L. Liu.

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Li, C., Wang, C.L., Liu, X.Y. et al. Effects of ionic strength and humic acid on 99TcO4 − sorption and diffusion in Beishan granite. J Radioanal Nucl Chem 293, 751–756 (2012). https://doi.org/10.1007/s10967-012-1746-6

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  • DOI: https://doi.org/10.1007/s10967-012-1746-6

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