A method for determining both diffusion and sorption coefficients of rock medium within a few days by adopting a micro-reactor technique

Okuyama, Keita; Sasahira, Akira; Noshita, Kenji; Ohe, Toshiaki

doi:10.1016/j.apgeochem.2008.03.017

Cited by 7 publications

(13 citation statements)

References 11 publications

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“…Figure shows schematics of the microchannel flow‐through (MCFT) test apparatus. The test apparatus has been originally developed by Okuyama et al . to measure both diffusion and sorption coefficients of rock medium, and it has been modified to suit measurement of the glass dissolution/corrosion rate by Inagaki et al .…”

Section: Methodsmentioning

confidence: 99%

Initial Dissolution Rate of the International Simple Glass as a Function of pH and Temperature Measured Using Microchannel Flow‐Through Test Method

Inagaki

Kikunaga

Idemitsu

et al. 2013

Int J of Appl Glass Sci

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International simple glass (ISG) is a six-component alumino-borosilicate glass developed as a reference benchmark glass for six nations collaborating study on high-level nuclear waste glass dissolution/corrosion mechanism. In this study, aqueous dissolution tests were performed for the ISG using microchannel flow-through (MCFT) method to evaluate the initial dissolution rate of glass matrix, r 0 , precisely and systematically as a function of solution pH and temperature. The test results indicated that the r 0 shows a "V-shaped" pH dependence with a bottom at around pH4 at each temperature. Compared with Japanese reference glass of P0798, for which the r 0 showed a "U-shaped" pH dependence with a bottom at around pH6 in our previous study, the ISG shows the higher dissolution rate at basic pH, and lower dissolution rate at neutral to acidic pH. The results also indicated that the r 0 increases with temperature according to an Arrhenius law, and the apparent activation energy evaluated from Arrhenius relation is 62-77 [kJ/mol] at any pH from 3 to 10, which suggests the initial dissolution of ISG proceeds controlled by a surface-reaction mechanism in this pH range.

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Section: Methodsmentioning

confidence: 99%

Initial Dissolution Rate of the International Simple Glass as a Function of pH and Temperature Measured Using Microchannel Flow‐Through Test Method

Inagaki

Kikunaga

Idemitsu

et al. 2013

Int J of Appl Glass Sci

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“…The R m values obtained by the two methods were almost identical, therefore the area enclosed by the lines of C/C 0 = 1 and BTC represented the Cs diffusion into the granite matrix or the Cs absorbed on the rock surface (Okuyama, et al, 2008). …”

Section: Adsorption Of 134 Csmentioning

confidence: 75%

“…The values of D e and D 0 for 3 H are 1.5 ×10 -11 m 2 /s (Okuyama, et al, 2008) When the Cs-containing solution flowed through the flow channel and storage unit, it was dispersed in the longitudinal direction. The length of the flow channel (20 mm) was much shorter than that of the storage unit (7.6 m length), thus we neglected dispersion in the flow channel.…”

Section: Discussionmentioning

confidence: 88%

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Clarification of Adsorption Reversibility on Granite that Depends on Cesium Concentration

Okuyama¹,

Noshita²

2012

Municipal and Industrial Waste Disposal

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“…The micro fluid channel was constructed using a fluoroplastic spacer. The reactor was connected with inlet and outlet ports (diameter 0.5 mm) for the injection or drainage of (Okuyama et al, 2008). (b) Details of sample preparation for ion beam analysis.…”

Section: Micro-reactor With Simulated Channelmentioning

confidence: 99%

Adsorption and diffusion of strontium in simulated rock fractures quantified via ion beam analysis

et al. 2012

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An experimental technique has been developed and applied to the problem of determining effective diffusion coefficients and partition coefficients of Sr in low permeability geological materials. This technique, the micro-reactor simulated channel method (MRSC), allows rapid determination of contaminant transport parameters with resulting values comparable to those determined by more traditional methods and also creates product surfaces that are amenable for direct chemical analysis. An attempt to further constrain mass flux was completed by detailed ion beam analysis of polished tuff surfaces (tuff is a polycrystalline polyminerallic aggregate dominated by silicate phases) that had been reacted with Sr solutions at concentrations of 10, 10 and 10 mol 1. Ion beam analysis was carried out using beams of both protons (using particle induced X-ray emission and elastic backscattering spectrometry or EBS) and alpha-particles (using Rutherford backscattering spectrometry). The ion beam analyses showed that increased solution concentrations resulted in increased surface concentrations and that in the highest concentration experiment, Sr penetrated to at least 4 mm below the primary interface. The Sr surface concentrations determined by EBS were 0.06 (±0.05), 0.87 (±0.30) and 2.40 (±1.0) atomic weight % in the experiments with starting solution concentrations of 10 , 10, and 10 mol 1, respectively. © 2012 The Mineralogical Society

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A method for determining both diffusion and sorption coefficients of rock medium within a few days by adopting a micro-reactor technique

Cited by 7 publications

References 11 publications

Initial Dissolution Rate of the International Simple Glass as a Function of pH and Temperature Measured Using Microchannel Flow‐Through Test Method

Initial Dissolution Rate of the International Simple Glass as a Function of pH and Temperature Measured Using Microchannel Flow‐Through Test Method

Clarification of Adsorption Reversibility on Granite that Depends on Cesium Concentration

Adsorption and diffusion of strontium in simulated rock fractures quantified via ion beam analysis

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