Diffusion experiments for estimating radiocesium and radiostrontium sorption in unsaturated soils from Spain: Comparison with batch sorption data

Aldaba, D.; Rigol, Anna; Vidal, Miquel

doi:10.1016/j.jhazmat.2010.05.124

Cited by 29 publications

(11 citation statements)

References 28 publications

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“…However, taking into account that in the batch experiments carried in this work the actual amount of radioselenate was unknown, the batch d probably underestimated the actual radioselenite soil sorption capacity due to the presence of a significant concentration of non-sorbed radioselenate in the contact solution, and the resulting batch d could be taken as the weighted value for the sorption of the two radioselenium species in the soils. For that reason, in contrast with results obtained for other radionuclides in previous works [47], it is not possible to find a correlation between d values derived from diffusion experiments and those obtained from batch experiments. In addition, the radioselenite d values derived from diffusion data were within the range of values reported in the literature, also obtained by batch experiments.…”

Section: Radioselenium Sorptioncontrasting

confidence: 97%

Transport of radioselenium oxyanions by diffusion in unsaturated soils

et al. 2015

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There is a lack of data on the diffusion of longlived radionuclides in soils, especially of those originated from the leaching of radioactive waste in waste disposal facilities. Here, the simultaneous diffusion of two radioselenium species, which were postulated to be radioselenite and radioselenate, was examined for the first time in four soils at laboratory level by applying the planarsource method. The Gaussian-shaped experimental diffusion profile was deconvoluted into two Gaussian functions, and then the apparent diffusion coefficients ( a ) were quantified for each species. Radioselenate a values ranged from 1.4 × 10 −11 to 1.5 × 10 −10 m 2 s −1 , while those of radioselenite were two orders of magnitude lower (from 5.2 × 10 −13 to 2.7 × 10 −12 m 2 s −1 ) for all samples and conditions tested. The radioselenite distribution coefficient values derived from a correlated to soil properties, such as pH and Al/Fe mineral content, and thus were consistent with the factors controlling the sorption of selenium species in soils.

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Section: Radioselenium Sorptioncontrasting

confidence: 97%

Transport of radioselenium oxyanions by diffusion in unsaturated soils

et al. 2015

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“…For some reasons these K D discrepancies have often been attributed to the fact that the conditions of batch adsorption tests "have long been known to be unrepresentative of those existing in compacted clays", i.e., the surface properties and/or the adsorption site accessibility depend on the compaction (Shackelford and Moore 2013). This statement fi nds its origin in the batch and diffusion K D discrepancies observed primarily for Cs + in a range of published studies, with batch K D values typically higher than diffusion K D values (Miyahara et al 1991;Tsai et al 2001;Jakob et al 2009;Aldaba et al 2010). Studies of Cs + that compared adsorption in loose and compacted clay material, without relying on diffusion experiments, led to apparently contradictory results.…”

Section: K D Values Obtained From Static and Diffusion Experimentsmentioning

confidence: 99%

Ionic Transport in Nano-Porous Clays with Consideration of Electrostatic Effects

Tournassat

Steefel

2015

Reviews in Mineralogy and Geochemistry

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“…Because retention is a very important aspect in a repository, several studies related to estimation of the Kd values for common isotopes present in radioactive wastes are found (EPA, 1999a,b;Sheppard, 2003;Wieland and Loon, 2003;EPA, 2004;Aldaba et al, 2010), although there are very few studies related to the impact of alkaline interaction on this parameter (Euratom, 2005). …”

Section: Impact Of Alkaline Alteration On Sorption Of Cesiummentioning

confidence: 99%

Impact of an Alkaline Solution on the Chemistry, Mineralogy, and Sorption Properties of a Typic Rhodudult Soil

Calábria

Cota

Ladeira

2017

Rev. Bras. Ciênc. Solo

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Abstract:The preferred option for disposal of short-lived low and intermediate level radioactive wastes is a near surface disposal facility in which soil is one of the barriers that avoid radionuclide migration outside the controlled area. For construction of that kind of facility, concrete is widely used, and its interaction with water induces its degradation, resulting in a high pH solution. The alkaline solution may affect the near-field environment of radioactive waste repositories, including the soil, promoting mineralogical alterations that result in significant changes in key properties of materials, compromising their performance as safety components. In this study, a sample of a Brazilian Typic Rhodudult soil, previously investigated concerning its performance for Cs sorption, was subjected to interaction with the alkaline solution for 24 h and for 7, 14, and 28 days in order to evaluate the impact on its chemical, mineralogical, and sorption properties. X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), atomic absorption spectrometry (AAS), scanning electron microscopy (SEM), and electron microprobe analysis were performed before and after each alteration period. Results indicated dissolution of minerals, such as kaolinite and quartz, associated with incorporation of K and Ca from the alkaline solution, likely resulting in the formation of hydrated calcium silicate phases (CSH), which are expected to be worse sorbents for alkaline elements (e.g., Cs) than the original minerals. The Kd values for Cs in the altered samples also decreased according to the alteration period, demonstrating that alkaline interaction effectively modifies the soil sorption properties for Cs.

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Diffusion experiments for estimating radiocesium and radiostrontium sorption in unsaturated soils from Spain: Comparison with batch sorption data

Cited by 29 publications

References 28 publications

Transport of radioselenium oxyanions by diffusion in unsaturated soils

Transport of radioselenium oxyanions by diffusion in unsaturated soils

Ionic Transport in Nano-Porous Clays with Consideration of Electrostatic Effects

Impact of an Alkaline Solution on the Chemistry, Mineralogy, and Sorption Properties of a Typic Rhodudult Soil

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