Modeling of diffusion behavior of humic acid and Nd in the presence of humic acid in compacted bentonite |
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| Institution: | 1. Waste Isolation Research Division, Japan Atomic Energy Agency, 4-33, Muramatsu, Tokai, Ibaraki 319-1194, Japan;2. Waste Management Department, Nuclear Fuel Cycle Engineering Laboratories, Japan Atomic Energy Agency, 4-33, Muramatsu, Tokai, Ibaraki 319-1194, Japan;3. Inspection Development Company Ltd., 4-33, Muramatsu, Tokai, Ibaraki 319-1112, Japan;1. Department of Chemistry, Faculty of Arts and Sciences, Erzincan University, 24100, Erzincan, Turkey;2. Department of Chemistry, Faculty of Arts and Sciences, Recep Tayyip Erdoğan University, 53100, Rize, Turkey;1. Corrosion Science and Technology Division, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603 102, India;2. Analytical Chemistry and Spectroscopy Division, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603 102, India;1. Dipartimento di Ingegneria Strutturale, Edile e Geotecnica [Department of Structural, Geotechnical and Building Engineering], Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy;2. R&S, Syndial S.p.A. ENI Group, Piazza Marcello Boldrini 1, 20097 San Donato Milanese, MI, Italy;1. Dokuz Eylül University, Graduate School of Natural and Applied Sciences, Dept. of Civil Engineering, Tınaztepe Campus, 35390 Buca-Izmir, Turkey;2. Dokuz Eylül University, Dept. of Civil Engineering, Tınaztepe Campus, 35390 Buca-Izmir, Turkey |
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| Abstract: | The diffusion behavior of HA and Nd in the presence of HA in compacted bentonite was investigated experimentally by means of the through-diffusion method. Breakthrough of HA is observed in 1 and 0.1 mol dm−3 NaCl solution and is more significant with a lower dry density such as 1.2 Mg m−3. The one dimensional diffusion model taking parallel complexation equilibrium into account was fitted to the experimentally obtained breakthrough curves and concentration profiles, and the diffusion parameters, such as effective diffusivity and rock capacity factor, were evaluated. The obtained effective diffusivity, around 10−11 m2 s−1, for HA and Nd–HA is comparable to the previously reported value. Using these parameters, predictive calculations were performed to evaluate the effect of HA concentration and sorption distribution coefficient. It is indicated that the effect of sorption distribution coefficient is significant only for a short period and that relatively low HA concentrations might bring higher diffused mass depending on the diffusion behavior of dominant species. |
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| Keywords: | Humic acid Compacted bentonite Neodymium Diffusion Modeling |
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