Returning land contaminated as a result of radiation accidents to farming use

Воронина, А. В.; Blinova, M. O.; Семенищев, В. С.; Gupta, Dharmendra K.

doi:10.1016/j.jenvrad.2015.03.012

Cited by 26 publications

(5 citation statements)

References 19 publications

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“…The Cs sorption on glauconite at trace concentration levels is not pH dependent (Poinssot et al 1999). Compared to standard batch sorption tests with illite (Comans et al 1991, Voronina et al 2015, the solid/liquid ratios in these batch sorption experiments are higher. Due to the large glauconite grains in the sand, larger solid sample sizes were required to have a representative sample.…”

Section: Batch Sorption Studiesmentioning

confidence: 83%

Radiocaesium sorption on natural glauconite sands is unexpectedly as strong as on Boom Clay

Bruneel

Laer

Brassinnes

et al. 2020

Science of The Total Environment

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The Neogene-Paleogene glauconite sands of Belgium cover the Boom Clay deposits that are candidate host for radioactive waste disposal. It is unclear if the highly permeable sand formations may act as an additional barrier for radiocesium ( 137 Cs) or could be added as a complementary sorption sink in a surface disposal concept. Glauconite is an Fe-rich phyllosilicate that is mainly present as 250-125 µm sized pellets in sand, it is unknown to what extent and how fast these pellets may bind 137 Cs. Pelletized clays embedded in sand may have poorly accessible high affinity sites for 137 Cs. The 137 Cs sorption on 11 different glauconite sands was measured in batch in a background solution of 0.1 M CaCl2 and 0.5 mM KCl. The log transformed 137 Cs distribution coefficient Kd (L kg -1 ) after 30 days reaction ranged 3.4-4.3, surprisingly close to the Kd of the Boom Clay (3.5). Isolated glauconite fractions exhibited similar 137 Cs sorption potentials (log Kd 4.1-4.3) as the reference Illite duPuy (4.4). The small Kd variation among the Neogene-Paleogene sands was explained by its glauconite content (r=0.82). The 137 Cs sorption kinetics (1-57 days) of milled pellets (<2 µm) confirmed slower reaction with intact pellets than with milled samples. Additionally, the Kd values of milled samples (57 days) sorption are 1.1-1.5 fold larger than the corresponding intact pellets, suggesting that not all Cs binding sites are accessible in intact pellets. Strongly weathered pellets exhibited cracks (visible with SEM). In these pellets the Kd was similar for milled and intact pellets suggesting that cracks increase the accessibility of the inner sorption sites. After 8.5 months the Kd values were 1.6-1.8-fold above corresponding 1 month data and these long-term reactions were more pronounced as total sand K content was larger. An adsorption-desorption experiment illustrated that 137 Cs sorption is not fully reversible.

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Section: Batch Sorption Studiesmentioning

confidence: 83%

Radiocaesium sorption on natural glauconite sands is unexpectedly as strong as on Boom Clay

Bruneel

Laer

Brassinnes

et al. 2020

Science of The Total Environment

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“…In [31] the mechanism of intercalation of iron hydroxocomplexes into the matrix of the porous structure of cobalt and nickel ferrocyanide was reviewed. It has been established that, as a rule, molecules of different sizes and geometry can intercalate into the same layered matrix, that is, there is no molecular sieve effect at the stage of layered materials modification, which determines a wide range of radionuclides absorbed by them of various valences and forms of occurrence in aqueous solutions.…”

Section: Sorption Properties Of Hybrid Compositionsmentioning

confidence: 99%

Hybrid Composite Materials for Immobilization of Radionuclides in Liquid Radioactive Waste

GК¹

2023

J Miner Sci Materials

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The biphasic hybrid composite materials for immobilization and fixation of radionuclides of the Liquid Radioactive Waste (LRW) of the research water-water reactor KIR WWR-K have been studied. It was found that the hybrid compositions have a high synergistic effect regard to the sorption of radionuclides, especially 137Cs+ and 134Cs+ . The distribution coefficient of cesium radionuclides in the composite materials are 2 times higher in comparison with the those sorption activity in the mineral matrix. It has been established that the sorption of radionuclides by two-phase hybrid compositions is carried out by a combination of three mechanisms. Firstly, due to the electrostatic binding reaction between the functional groups of sorbents and metal ions stabilized by the system of coordination bonds with electron-donating nitrogen and oxygen atoms of the amino and carbonyl groups of the polymer matrix. Secondly, as a result of ion exchange between counterions of the mineral matrix and radionuclides ions in the environmental solution. Finally, due to the superequimolar absorption of radionuclides as a result of deformation of the crystal lattice of mineral fillers of the polymer matrix of bentonite and copper ferrocyanide, which increases their pore size. It has been shown that biphasic hybrid composite materials have an increased mechanical and radiation resistance while retaining elasticity even at high doses of electron irradiation, at which in despite on a noticeable decrease the value of deformation there is no significant decline in their compressive strength. The obtained information on the mechanism of binding of biphasic hybrid composite materials with various metal ions makes it possible to synthesize new classes of materials for selective sorption of certain types of radionuclides in the body of mineral and polymer matrices. This will allow us to use these materials as a highly effective sorption materials with a synergetic effect for the detection, identification, immobilization and fixation of LRW radionuclides.

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“…The total absorption of the radionuclide per unit dry mass in the plants (Bq kg À1 ) resulting by the one in the soil (also given in Bq kg À1 ). When any radioactively contaminated land is being remediated with the aim of returning for agricultural use, procedures for decreasing radionuclide transference from soil to vegetation are obligatory (Voronina et al 2015).…”

Section: Prefacementioning

confidence: 99%

Remediation Measures for Radioactively Contaminated Areas

2019

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Returning land contaminated as a result of radiation accidents to farming use

Cited by 26 publications

References 19 publications

Radiocaesium sorption on natural glauconite sands is unexpectedly as strong as on Boom Clay

Radiocaesium sorption on natural glauconite sands is unexpectedly as strong as on Boom Clay

Hybrid Composite Materials for Immobilization of Radionuclides in Liquid Radioactive Waste

Remediation Measures for Radioactively Contaminated Areas

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