A statistical evaluation to compare and analyze estimations of the diffusion coefficient of pertechnetate (99TcO4) in compacted bentonite

Chuan Pin Lee, Yanqin Hu, Dongyang Chen, Neng Chuan Tien, Shih Chin Tsai, Yunfeng Shi, I. Hsien Lee, Chuen Fa Ni

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Abstract

Various numerical methods have been being extensively used to estimate the diffusion parameters of pertechnetate (99TcO4) in compacted MX80 bentonite clay using through-diffusion (TD) techniques. In this study, an improved TD column test was applied, and the diffusion fluxes of tritium (HTO) as a non-reactive radionuclide, and99TcO4 with various dry densities, were compared under the same experimental conditions. Similar results were obtained for the apparent diffusion coefficients of HTO and99TcO4 using three estimation methods: a graphical method applying the asymptote calculation, an analytical solution using Lsqcurvefit installed in MATLAB, and the Marquardt–Levenberg optimization algorithm in the HYDRUS-1D inverse method. The statistical analysis showed that the densities using a one-way analysis of variance (ANOVA) for the three estimation methods ranged from 1200 to 2000 kg/m3, which indicated that there were no obvious differences between HTO and99TcO4. In general, the diffusion parameters of99TcO4 were lower than those for HTO due to anion exclusion effects and lower accessible porosity.

Original languageEnglish
Article number1075
JournalMinerals
Volume11
Issue number10
DOIs
StatePublished - Oct 2021

Keywords

  • ANOVA
  • Asymptote
  • Diffusion
  • HYDRUS-1D
  • MX80 bentonite

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