Diffusion of ionic species in bentonite
Webspecies are dominant, data obtained under reducing condi-tions are limited.9,10) In particular, D e data for Se(-II) species are scarce. For an interpretation of the diffusion behavior of Se spe-cies in bentonite porewater, it is necessary to understand diffusion phenomena in bentonite porewater based on diffu-sion mechanisms. WebApr 4, 2024 · The diffusion of Re (VII), Se (IV) and Cr (VI) in compacted Gaomiaozi bentonite was conducted by an integrated diffusion setup. The effective diffusion coefficient and the rock capacity factor of Re (VII), Se (IV) and Cr (VI) were measured.
Diffusion of ionic species in bentonite
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Weba knowledge of the diffusive transport of sulphide through the bentonite to the surfaces of the canisters as well as the outwards tran-sport of hydrogen formed radiolytically near the canisters is important. A study of the diffusion of these species have therefore been carried out. The effect of ionic size on WebDiffusion of ionic species in bentonite P. Leroy a , b ,A.Revil a , ∗ , D. Coelho b a CNRS, CEREGE, Department of Hydrogeophysics and Porous Media, University Aix-Marseille III, Aix-en-Provence ...
WebIn Figure 9 is presented the dependence between the molybdenum ionic species and the pH. Based on the diagram (depicted in Figure 9 ) can be observed that the preponderant ionic species into the pH interval 6 to 8 it is MoO 4 2 − , meaning that this will be adsorbed onto the new produced adsorbent material. WebThis thesis presents the results of studies on the diffusion mechanisms of anions and cations in compacted sodium bentonite, which is planned to be used as a buffer material in nuclear waste disposal in Finland. The diffusivities and sorption factors were determined by tracer experiments.
Webof bentonite (kg-m-3), t the time (s), Da the apparent diffusion coefficient (m2.s-l), X the distance from the diffusion source (m) and M the total amount of tracer per unit area … WebDiffusion of ionic species in bentonite P. Leroy a , b ,A.Revil a , ∗ , D. Coelho b a CNRS, CEREGE, Department of Hydrogeophysics and Porous Media, University Aix-Marseille …
WebJan 1, 1996 · The information available from the open literature and our studies on exclusion, sorption and diffusion mechanisms of ionic and neutral species in …
WebSep 12, 2005 · This website requires cookies, and the limited processing of your personal data in order to function. By using the site you are agreeing to this as outlined … hello system linuxWebThe differences in the apparent diffusion coefficients of cations could be explained rather well by the hydration tendency which depends on the charge and ionic radius of the … hello talkWebEnter the email address you signed up with and we'll email you a reset link. hello talent jumboWebA literature review of diffusion and sorption properties of mainly ionic species in water saturated compacted bentonite has been made. Experimental methods used to … hello talk mod vipWebFeb 26, 2011 · A new model based on ionic diffusion in surface (bound) and interstitial (free) water in compacted bentonite systems has been developed. The model is … hello takerWebKorichi used a constant source diffusion experiment to investigate the migration and diffusion of uranium in Algerian bentonite and NaCl activated bentonite. The results showed that when the dry density of compacted samples was 1.4, 1.8, and 2.4 g/cm 3 , the apparent diffusion coefficient varied from 1.1 × 10 −12 m 2 /s < D a < 5.5 × 10 − ... hello talesWebdiffusion approach has been questioned in some cases, as it is shown to not correctly represent the diffusion of cations, anions and neutral species simultaneously. The effective diffusion coefficient is shown to be dependent on the dry density of the material, as well as on the salinity (ionic strength) of the external solution. hello talk online status