Role of bentonite colloids on europium and plutonium migration in a granite fracture

Missana, Tiziana; Alonso, Úrsula; Garcı́a-Gutiérrez, Miguel; Mingarro, M.

doi:10.1016/j.apgeochem.2008.01.008

Cited by 89 publications

(40 citation statements)

References 30 publications

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“…Moreover, anionic exclusion is usually under consideration for 36 Cl − . On the other hand, dynamic experiments with these radionuclides can be therefore used to describe hydrodynamic characterization of the given column [3, 4]. For example, HTO as conservative tracer was used within a series of column experiments with colloids for comparison retardation time of colloids and studying radionuclides (e.g., 244 Pu, 241 Am, 152 Eu).…”

Section: Introductionmentioning

confidence: 99%

“…For example, HTO as conservative tracer was used within a series of column experiments with colloids for comparison retardation time of colloids and studying radionuclides (e.g., 244 Pu, 241 Am, 152 Eu). The experiments with HTO were conducted at different flow rates [4, 5]. Voudrias et al studied transport of tritium in mudstone, halite and carbonate rocks by column sorption/desorption experiments.…”

Section: Introductionmentioning

confidence: 99%

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Interaction of 3H+ (as HTO) and 36Cl− (as Na36Cl) with crushed granite and corresponding fracture infill material investigated in column experiments

Ştamberg

Palágyi

Videnská

et al. 2013

J Radioanal Nucl Chem

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The transport of 3H+ (as HTO) and 36Cl− (as Na36Cl) was investigated in the dynamic system, i.e., in the columns filled with crushed pure granite and fracture infill of various grain sizes. The aim of column experiments was to determine important transport parameter, such as the retardation, respectively distribution coefficients, Peclet numbers and hydrodynamic dispersion coefficients. Furthermore, the research was focused to quantification of the effect of grain size on migration of studied radionuclides. The experimental breakthrough curves were fitted by a model based on the erfc-function, assuming a linear reversible equilibrium sorption/desorption isotherm, and the above mentioned transport parameters were determined. The results showed that influence of grain size on sorption of 3H+ and 36Cl− was negligible. Retardation and distribution coefficients of both tracers converged to one and zero, respectively, in case of all fractions of crushed granite and infill material. Generally, the presumed ion exclusion of 36Cl in anionic form was proved under given conditions, only very weak one seems to exist in a case of infill material. In principal, both radionuclides behaved as non-sorbing, conservative tracers. On the other hand, the influence of grain size on Peclet numbers value and on dispersion coefficient was observed for both crystalline materials, namely in agreement with theoretical suppositions that the values of Peclet numbers decrease with increasing grain size and values of dispersion coefficient increase.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Interaction of 3H+ (as HTO) and 36Cl− (as Na36Cl) with crushed granite and corresponding fracture infill material investigated in column experiments

Ştamberg

Palágyi

Videnská

et al. 2013

J Radioanal Nucl Chem

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“…It is worth mentioning that especially bentonite barriers in contact with weakly mineralized groundwater generate a highly concentrated colloidal phase which is liable to carry radionuclides (Albarran et al, 2008;Kalmykov et al, 2011;Kurosawa & Ueta, 2001;Missana et al, 2008;Sabodina et al, 2006;Tertre et al, 2005;Vilks et al, 2008).…”

Section: Colloids Generated By Engineered Barriersmentioning

confidence: 99%

Particulate Phases Possibly Conveyed from Nuclear Waste Repositories by Groundwater

Marin¹

2012

Radioactive Waste

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“…The result is that radionuclides that are considered as immobile (e.g. Pu, Eu) may be mobile in the presence of bentonite colloids (Alonso et al 2003;Delos et al 2008;Missana et al 2008). Numerous studies have demonstrated that colloid particles can increase the mobility of Am, Np, Pu and U (Kretzschmar & Schäfer 2005).…”

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confidence: 99%

“…In situ transport experiments have been widely performed at the Grimsel Test Site (GTS) (Missana et al 2008). For example, the international Colloid and Radionuclide Retention (CRR) project demonstrated that bentonite colloids influenced in a significant way the in situ retardation behaviour of tri-and tetravalent actinides.…”

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confidence: 99%

Study of ⁸⁵ Sr transport through a column filled with crushed granite in the presence of bentonite colloids

Kolomá

Červinka

2016

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The present work is focused on the study of strontium transport through crushed granite in the presence of bentonite colloids under dynamic arrangement. The aim of the experiments was to investigate the effect of bentonite colloids on strontium migration in crushed granite. The tracer behaviour was studied in a column set-up under aerobic conditions with a continuous inlet of the liquid phase of a constant tracer concentration (activity) and flow rate. Defined volumes of liquid phase were sampled at periodic time intervals at the column outlet for the measurements of tracer concentrations (activity). The transport was described by breakthrough curves. The stepwise approach included these steps: (1) an evaluation of the hydrodynamic column properties by the non-sorbing tracer 3 H; (2) a column experiment with bentonite colloids in deionized water was performed; (3) migration of 85 Sr solution in two liquid phases (deionized and synthetic granitic water); and (4) the transport of a radiocolloid suspension in deionized water was studied. Results showed different behaviour of bentonite colloids and strontium in the column. Bentonite colloids behaved as a non-sorbing tracer: conversely, strontium showed strong sorption on granitic material. The strontium transport in the presence of bentonite colloids differed from strontium transport itself. The strontium transport in the presence of colloids was faster than transport without the bentonite colloids. The observed retention of strontium on granite suggests a higher affinity of strontium towards granitic rock than towards bentonite colloids, and showed the reversibility of the sorption of strontium on bentonite colloids.

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Role of bentonite colloids on europium and plutonium migration in a granite fracture

Cited by 89 publications

References 30 publications

Interaction of 3H+ (as HTO) and 36Cl− (as Na36Cl) with crushed granite and corresponding fracture infill material investigated in column experiments

Interaction of 3H+ (as HTO) and 36Cl− (as Na36Cl) with crushed granite and corresponding fracture infill material investigated in column experiments

Particulate Phases Possibly Conveyed from Nuclear Waste Repositories by Groundwater

Study of ⁸⁵ Sr transport through a column filled with crushed granite in the presence of bentonite colloids

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Role of bentonite colloids on europium and plutonium migration in a granite fracture

Cited by 89 publications

References 30 publications

Interaction of 3H+ (as HTO) and 36Cl− (as Na36Cl) with crushed granite and corresponding fracture infill material investigated in column experiments

Interaction of 3H+ (as HTO) and 36Cl− (as Na36Cl) with crushed granite and corresponding fracture infill material investigated in column experiments

Particulate Phases Possibly Conveyed from Nuclear Waste Repositories by Groundwater

Study of 85 Sr transport through a column filled with crushed granite in the presence of bentonite colloids

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Study of ⁸⁵ Sr transport through a column filled with crushed granite in the presence of bentonite colloids