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A Statistical Evaluation to Compare and Analyze Estimations of the Diffusion Coefficient of Pertechnetate (99 TcO 4 −) in Compacted Bentonite.
- Source :
- Minerals (2075-163X); Oct2021, Vol. 11 Issue 10, p1075-1075, 1p
- Publication Year :
- 2021
-
Abstract
- Various numerical methods have been being extensively used to estimate the diffusion parameters of pertechnetate (<superscript>99</superscript>TcO<subscript>4<superscript>−</superscript></subscript>) 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, and <superscript>99</superscript>TcO<subscript>4<superscript>−</superscript></subscript> with various dry densities, were compared under the same experimental conditions. Similar results were obtained for the apparent diffusion coefficients of HTO and <superscript>99</superscript>TcO<subscript>4<superscript>−</superscript></subscript> 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/m<superscript>3</superscript>, which indicated that there were no obvious differences between HTO and <superscript>99</superscript>TcO<subscript>4<superscript>−</superscript></subscript>. In general, the diffusion parameters of <superscript>99</superscript>TcO<subscript>4<superscript>−</superscript></subscript> were lower than those for HTO due to anion exclusion effects and lower accessible porosity. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 2075163X
- Volume :
- 11
- Issue :
- 10
- Database :
- Complementary Index
- Journal :
- Minerals (2075-163X)
- Publication Type :
- Academic Journal
- Accession number :
- 153340978
- Full Text :
- https://doi.org/10.3390/min11101075