Effect of grain size on the sorption and desorption of SeO4 2− and SeO3 2− in columns of crushed granite and fracture infill from granitic water under dynamic conditions

Videnská, K.; Palágyi, Š.; Ştamberg, K.; Vodičková, H.; Havlová, Václava

doi:10.1007/s10967-013-2429-7

Cited by 15 publications

(4 citation statements)

References 19 publications

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“…Analogous to the previous studies [16–18], two following types of crystalline rocks were used: pure granite, coded as PDM1-1, and fracture infill material, coded as PDM1-2. Rocks were sampled from PDM1 borehole; the samples PDM1-1 from 97.5 to 98.7 m depth and PDM1-2 from 89.7 to 90.0 m depth.…”

Section: Methodsmentioning

confidence: 99%

“…The transport model is based on erfc-function obtained as a result of analytical solution of a 1-D advection–dispersion equation (ADE) under sorption/desorption boundary conditions [15–18]. It can be used for fitting the experimental dynamic data and for calculation (description) of a breakthrough curve (BTC).…”

Section: Transport Modelmentioning

confidence: 99%

“…The BTC is a dependence of the output relative activity ( A rel ) or concentration ( C rel ) of the dissolved component on the number of bed pore volumes ( n PV ). In principle, the transport model itself can be modified by incorporation of linear equilibrium isotherm (linear isotherm approach), or non-linear equilibrium isotherm (non-linear isotherm approach), which can be found in our previous publications [14–18]. Therefore, only the basic principles of linear isotherm approach, characterizing the interaction of components type of 3 H + and 36 Cl − , are given below…”

Section: Transport Modelmentioning

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: Methodsmentioning

confidence: 99%

Section: Transport Modelmentioning

confidence: 99%

Section: Transport Modelmentioning

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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“…In the environment, selenium can have four different oxidation states: Se(−2) (selenide), Se(0) (elemental selenium), Se(4) (selenite), and Se(6) (selenate). Se(−2) and Se(0) are poorly soluble, whereas Se(4) and Se(6) are soluble and mobile and are foreseen to occur in radioactive storage sites in the form of anionic complexes . Se(6) as SeO 4 2– will form the dominant Se(6) species under the alkaline pH > 10 conditions associated with cement porewaters and leachates. , Wu et al proposed that Friedel’s salt, an AFm phase containing interlayer Cl (AFm-Cl 2 ), efficiently sorbs SeO 4 2– , but they performed single batch experiments which may be difficult to interpret.…”

Section: Introductionmentioning

confidence: 99%

Selenate Sorption by Hydrated Calcium Aluminate (AFm): Evidence for Sorption Reversibility and Implication for the Modeling of Anion Retention

Grangeon

Marty

Maubec

et al. 2019

ACS Earth Space Chem.

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The mechanisms of selenate (SeO 4 2− ) sorption by Friedel's salt (AFm-Cl 2 ), a layered double hydroxide phase found in (altered) cement-based materials, were studied using a combination of wet chemistry, electron probe, X-ray scattering, and transmission electron microscopy techniques. Flowing a solution containing SeO 4 2− through a suspension containing AFm-Cl 2 in a dedicated chemical reactor led to several chemical and crystallographic modifications that were quantified by geochemical modeling of the wet chemistry data and analysis of the X-ray diffraction and scattering data in the reciprocal and real spaces. It was found that SeO 4 2− replaced Cl − in the interlayer at the same crystallographic site to form monoselenate (AFm-SeO 4 ) with an exchange stoichiometry that depended on the charges of the anions. This replacement was accompanied by an increase of the layer-to-layer distance. Sorption reversibility, a key parameter in being able to distinguish between adsorption and other uptake mechanisms, such as coprecipitation or structural incorporation, was studied by contacting the newly formed AFm-SeO 4 with a Cl-rich solution. In this case, the Cl − /SeO 4 2− exchange reaction was found to be reversible, following the same stoichiometry as the forward reaction with two Cl − replacing one SeO 4 2− in the interlayer, and caused a reduction in the layer-to-layer distance. This study shows that AFm efficiently traps anions such as SeO 4 2− through adsorption reaction and may thus play a significant role in retarding the migration of anionic contaminants through cement-based material and also that the adsorbed anions may be later released in case of a solution chemistry change.

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Transport parameters of I− and IO3 − determined in crushed granitic rock columns and groundwater system under dynamic flow conditions

Palágyi

Ştamberg

2014

J Radioanal Nucl Chem

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Effect of grain size on the sorption and desorption of SeO4 2− and SeO3 2− in columns of crushed granite and fracture infill from granitic water under dynamic conditions

Cited by 15 publications

References 19 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

Selenate Sorption by Hydrated Calcium Aluminate (AFm): Evidence for Sorption Reversibility and Implication for the Modeling of Anion Retention

Transport parameters of I− and IO3 − determined in crushed granitic rock columns and groundwater system under dynamic flow conditions

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