Determining pseudo-equilibrium of montmorillonite colloids in generation and sedimentation experiments as a function of ionic strength, cationic form, and elevation

García-García, Sandra; Degueldre, C.; Wold, Susanna; Frick, Sabrina

doi:10.1016/j.jcis.2009.02.048

Cited by 14 publications

(2 citation statements)

References 26 publications

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“…For more detailed analyses of the stable colloid distribution after disaggregation, a single particle counter (SPC) was used. In SPC measurements, the samples were measured just after dilution, without shaking, allowing the largest particles to sediment (Degueldre et al, 1996a(Degueldre et al, , 2000García-García et al, 2009). Single particle counter (SPC).…”

Section: Size Distributionmentioning

confidence: 99%

Size distribution of FEBEX bentonite colloids upon fast disaggregation in low-ionic strength water

et al. 2016

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Bentonite colloids generated from the backfill barrier in nuclear waste repositories may act as radionuclide carriers, if they are stable and mobile. Repository scenarios with highly saline groundwater inhibit colloid stability as particles tend to aggregate but, in the time frame of repositories, groundwater conditions may evolve, promoting particle disaggregation and stabilization. The disaggregation of FEBEX bentonite colloids by fast dilution to lower ionic strength was analysed in this study. Time-resolved dynamic light-scattering experiments were carried out to evaluate the kinetics of bentonite colloid aggregation and disaggregation processes in Na+ and Na+-Ca2+ mixed electrolytes of low ionic strength. Attachment and detachment efficiencies were determined.Aggregation is promoted by increasing ionic strength, being more efficient in the presence of divalent cations. Once bentonite colloids are aggregated, a decrease in ionic strength facilitates disaggregation, but the process is not fully reversible as the initial size of the stable bentonite colloids at low ionic strength is not fully recovered. Particle-size distribution and concentration in suspension were analysed on disaggregated samples by single particle-counting measurements. Small colloids were measured in the disaggregated samples but their population was smaller than in the initial stable sample, especially in the presence of Ca2+.

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Section: Size Distributionmentioning

confidence: 99%

Size distribution of FEBEX bentonite colloids upon fast disaggregation in low-ionic strength water

et al. 2016

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“…The mobility of the colloids depends on the colloidal stability which in turn depends on pH, ionic strength, and temperature. These effects have been studied quite extensively [97][98][99][100]. However, in a deep repository, the bentonite colloids may also be exposed to ionizing radiation.…”

Section: Radiation Effects On the Stability Of Colloidal Montmorillonmentioning

confidence: 99%

Radiation Effects on Materials Used in Geological Repositories for Spent Nuclear Fuel

Jönsson

2012

ISRN Materials Science

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Safe long-term storage of radioactive waste from nuclear power plants is one of the main concerns for the nuclear industry as well as for governments in countries relying on electricity produced by nuclear power. A repository for spent nuclear fuel must be safe for extremely long time periods (at least 100 000 years). In order to ascertain the long-term safety of a repository, extensive safety analysis must be performed. One of the critical issues in a safety analysis is the long-term integrity of the barrier materials used in the repository. Ionizing radiation from the spent nuclear constitutes one of the many parameters that need to be accounted for. In this paper, the effects of ionizing radiation on the integrity of different materials used in a granitic deep geological repository for spent nuclear fuel designed according to the Swedish KBS-3 model are discussed. The discussion is primarily focused on radiationinduced processes at the interface between groundwater and solid materials. The materials that are discussed are the spent nuclear fuel (based on UO 2 ), the copper-covered iron canister, and bentonite clay. The latter two constitute the engineered barriers of the repository.

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Characterization of adsorption behaviors of U(VI) on bentonite colloids: batch experiments, kinetic evaluation and thermodynamic analysis

Liu¹,

Xu²,

Xu³

et al. 2022

J Radioanal Nucl Chem

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Determining pseudo-equilibrium of montmorillonite colloids in generation and sedimentation experiments as a function of ionic strength, cationic form, and elevation

Cited by 14 publications

References 26 publications

Size distribution of FEBEX bentonite colloids upon fast disaggregation in low-ionic strength water

Size distribution of FEBEX bentonite colloids upon fast disaggregation in low-ionic strength water

Radiation Effects on Materials Used in Geological Repositories for Spent Nuclear Fuel

Characterization of adsorption behaviors of U(VI) on bentonite colloids: batch experiments, kinetic evaluation and thermodynamic analysis

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