Effect of temperature on the complexation of triscarbonatouranyl(<scp>vi</scp>) with calcium and magnesium in NaCl aqueous solution

Shang, Chengming; Reiller, Pascal E.

doi:10.1039/d1dt03204f

Cited by 7 publications

(1 citation statement)

References 59 publications

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“…Because of high ionic strength and expected low solubility of uranium in such alkaline condition, the selected analytical method to measured accurate U(VI) concentration in solution is the timeresolved laser fluorescence (TRLFS) technique coupled to the method of standard addition. This technique has been proved particularly useful for speciation characterization of specific luminescent species in solution such as U(VI) [16], Cm(III) [17], or Eu(III) [18]. It can be used for quantitative determination as well [19-Error!…”

Section: Introductionmentioning

confidence: 99%

Uranium(VI) Retention onto Hardened Cement Paste under High Saline and Alkaline Conditions

Macé¹,

Page²,

Reiller³

2022

Preprint

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Evaluation of the mobility behavior of radionuclides in highly saline and alkaline conditions is a major concern for performance assessment of radioactive waste disposal. The aim of this study is to determine the effect of up to 2.8 mol/kgsolution content of NaNO3, onto the solubility and the sorption of U(VI) in a hardened cement-paste (HCP) prepared from an ordinary Portland cement (CEM I). To avoid the interference of the high salt concentration (and ionic strength) and because of expected low solubility of uranium under such alkaline conditions, the time-resolved laser fluorescence (TRLFS) was selected to measured accurate U(VI) concentration in solution using the standard addition method in 85% H3PO4 to limit dilution and matrix effects and allows determining of resulting [U(VI)] in solution with acceptable precision for distribution factor (Rd) both in sorption and desorption experiments. The operational solubility limit measured at high ionic strength is lowered by a factor 3 compared to the reference cementitious condition, with the Rd values decrease by ca. a factor 4. Sorption of U(VI) appears to be reversible under these conditions.

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Section: Introductionmentioning

confidence: 99%

Uranium(VI) Retention onto Hardened Cement Paste under High Saline and Alkaline Conditions

Macé¹,

Page²,

Reiller³

2022

Preprint

Self Cite

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Predominance of the alkaline earth(II) triscarbonatoactinyl(VI) complexes in different geochemical contexts: Review of existing data and estimation of potentially unidentified species

Reiller

2024

Chemosphere

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Kinetics study on the temperature-dependent reduction of aqueous U(VI) by natural pyrite

Jin,

Kang,

Kang

et al. 2024

Geochimica et Cosmochimica Acta

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Effect of temperature on the complexation of triscarbonatouranyl(vi) with calcium and magnesium in NaCl aqueous solution

Abstract: The complex formation of triscarbonatouranyl(VI) UO2(CO3)34- with alkaline earth metal ions Mg2+ and Ca2+ in 0.10 mol kgw-1 NaCl were studied at variable temperatures: 5-30°C for Mg2+ and 10-50°C for...

Cited by 7 publications

References 59 publications

Uranium(VI) Retention onto Hardened Cement Paste under High Saline and Alkaline Conditions

Uranium(VI) Retention onto Hardened Cement Paste under High Saline and Alkaline Conditions

Predominance of the alkaline earth(II) triscarbonatoactinyl(VI) complexes in different geochemical contexts: Review of existing data and estimation of potentially unidentified species

Kinetics study on the temperature-dependent reduction of aqueous U(VI) by natural pyrite

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