Evaluation of Migration of Cesium-137 Adsorbed on Fine Soil Particles through Natural Aerated Soil Layer

Ogawa, Hirotaka; Takebe, Shinichi; Yamamoto, T.

doi:10.1080/18811248.1991.9731350

Cited by 3 publications

(3 citation statements)

References 11 publications

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“…This is confirmed by sorption isotherms onto chalky soil and onto chalk doped with humic acids, which clearly highlights the part taken by humic substances for complexation and immobilization of U in the chalky soil. Nevertheless, these observations are of interest for further investigations on U migration in the subsurface since humic substances are also known to be easily mobilizable from soils, mobile in soils, and mobile in aquifers and can enhance U migration under colloidal form. − ,,,,, In the first 120 cm of the soil profile, where the U content is typically above 10 ppm, the results of EXAFS and TRLFS speciation analysis and interpretations from sorption isotherms are in agreement. The TRLFS analysis indicates a double speciation of U onto carbonate minerals, revealing the presence of at least two complexes for adsorbed U, which change proportion with U loading with a slight rearrangement of oxygen equatorial coordination, consistent with previous interpretations from other authors. − For low U loading on the calcite surface, a bidentate uranyl tricarbonate complex with a liebigite-type structure dominates the speciation.…”

Section: Discussionmentioning

confidence: 54%

“…Nevertheless, these observations are of interest for further investigations on U migration in the subsurface since humic substances are also known to be easily mobilizable from soils, mobile in soils, and mobile in aquifers and can enhance U migration under colloidal form. [36][37][38]42,43,72,123,124 3) In the first 120 cm of the soil profile, where the U content is typically above 10 ppm, the results of EXAFS and TRLFS speciation analysis and interpretations from sorption isotherms are in agreement. The TRLFS analysis indicates a double speciation of U onto carbonate minerals, revealing the presence of at least two complexes for adsorbed U, which change proportion with U loading with a slight rearrangement of oxygen equatorial coordination, consistent with previous interpretations from other authors.…”

Section: Discussionmentioning

confidence: 74%

Section: Discussionmentioning

confidence: 99%

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Uranium Speciation in a Chalky Soil

Bayle

Beccia

Moulin

et al. 2023

Environ. Sci. Technol.

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In this article, the speciation and behavior of anthropogenic metallic uranium deposited on natural soil are approached by combining EXAFS (extended X-ray absorption fine structure) and TRLFS (time-resolved laser-induced fluorescence spectroscopy). First, uranium (uranyl) speciation was determined along the vertical profile of the soil and bedrock by linear combination fitting of the EXAFS spectra. It shows that uranium migration is strongly limited by the sorption reaction onto soil and rock constituents, mainly mineral carbonates and organic matter. Second, uranium sorption isotherms were established for calcite, chalk, and chalky soil materials along with EXAFS and TRLFS analysis. The presence of at least two adsorption complexes of uranyl onto carbonate materials (calcite) could be inferred from TRLFS. The first uranyl tricarbonate complex has a liebigite-type structure and is dominant for low loads on the carbonate surface (<10 mgU/kg(rock)). The second uranyl complex is incorporated into the calcite for intermediate (∼10 to 100 mgU/kg(rock)) to high (high: >100 mgU/kg(rock)) loads. Finally, the presence of a uranium-humic substance complex in subsurface soil materials was underlined in the EXAFS analysis by the occurrence of both monodentate and bidentate carboxylate (or/and carbonate) functions and confirmed by sorption isotherms in the presence of humic acid. This observation is of particular interest since humic substances may be mobilized from soil, potentially enhancing uranium migration under colloidal form.

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Section: Discussionmentioning

confidence: 54%

Section: Discussionmentioning

confidence: 74%

Section: Discussionmentioning

confidence: 99%

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Uranium Speciation in a Chalky Soil

Bayle

Beccia

Moulin

et al. 2023

Environ. Sci. Technol.

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Co-transport of Cr(VI) and Bentonite Colloid in Saturated Porous Media

Wang

et al. 2022

Bull Environ Contam Toxicol

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Sorptive Removal of Cesium-137 and Strontium-90 from Water by Unconventional Sorbents. I. Usage of Bauxite Wastes (Red Muds)

Apak

Atun

Güçlü

et al. 1995

Journal of Nuclear Science and Technology

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Bauxite wastes of alumina manufacture, z'.e., red muds, have been tested for radiocesium and strontium removal from water. The red muds were water-washed, acid-, and heat-treated before usage to produce hydrous oxide like sorbents. Surface treatment of the sorbent was benefical for 13'Cs uptake, while heat-treatment was detrimental to the -SOH surface sites responsible for high affinity. Fractionation of the sorbent with respect to apparent grain size did not produce significant differences in the sorption efficiency. The distribution coefficients US. equilibrium activity in solution showed a maximum with Cs, and a gradual decrease trend with Sr. The solution activity us. adsorption data were fitted to B.E.T. (essentially types IV-V) isotherms for Cs and B. E. T.-Langmuir isotherms for Sr. Desorption, temperature-, pH-, and ionic strength-dependence tests revealed that the primary mode of sorption for both cations is specific adsorption while the secondary mode is ion exchange. A rise in pH favours the ionexchange sorption of Sr while the specific adsorption of Cs is negatively affected. Competitive adsorption of an inert electrolyte, i.e., NaCI, severely hinders Cs sorption, while S r sorption on water-washed red mud is not significantly affected.

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Evaluation of Migration of Cesium-137 Adsorbed on Fine Soil Particles through Natural Aerated Soil Layer

Cited by 3 publications

References 11 publications

Uranium Speciation in a Chalky Soil

Uranium Speciation in a Chalky Soil

Co-transport of Cr(VI) and Bentonite Colloid in Saturated Porous Media

Sorptive Removal of Cesium-137 and Strontium-90 from Water by Unconventional Sorbents. I. Usage of Bauxite Wastes (Red Muds)

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