A Comparative Study of Europium, Thorium and Uranium Binding to an Aquatic Fulvic Acid

Nordén, Maria; Albinsson, Yngve; Ephraim, James H.; Allard, Bert

doi:10.1557/proc-294-759

Cited by 5 publications

(4 citation statements)

References 18 publications

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“…Using the global interaction constants log BM HA β determined in this study, referring to [39], humic complexation is still predominant down to 10 −4 g/L at pH = 7.2, and 10 −3 g/La tp H= 7.9. In the latter case, Th(IV) is quantitatively associated to HA at 0.1g/Lwhichis in agreement with field observations [30,32,33,92,93] for the same conditions, even if the type of HA are not the same in both cases.…”

Section: Ta B L Esupporting

confidence: 91%

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On the study of Th(IV)-humic acid interactions by competition sorption studies with silica and determination of global interaction constants

Reiller¹,

Moulin²,

Casanova³

et al. 2003

Radiochimica Acta

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http://www.radiochimacta.deInternational audienceThe influence of humic acids (HA) on the retention of thorium (IV) onto the surface of silica colloids is investigated. Thorium is considered as an analogue of tetravalent actinides (U, Np, Pu), except for the fact that it has no f electrons. Silica (SiO2) is chosen as a model surface because it is a component of many minerals and because of its weak HA sorption properties. Retention experiments are performed by batch procedure at constant ionic strength (I = 0.1M NaClO4), at various pH (2 to 9) and HA concentrations (1–100 mg/L). The sorption of Th(IV) onto colloidal amorphous silica is characterised using a surface complexation model. The ternary system (i.e. HA-Th-Silica) clearly shows the influence of HA on Th(IV) retention. This can lead to a strong reduction of the amount of Th(IV) sorbed onto silica in the presence of HA compared to silica colloids without HA, due to a predominant part of thorium present in solution as humic complexes. In a pH range where no organic coating onto silica occurs, there is a competitive reaction between Th(IV) sorption onto the silica surface and onto HA reactive functional groups. In this case, Schubert's method is applied to obtain a global interaction constant for the Th(IV)-HA system. The large interaction constant values indicate a strong affinity of HA for Th(IV)

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Section: Ta B L Esupporting

confidence: 91%

“…The strong interaction of thorium with humic substances is known [31][32][33][34]. Data concerning the complexation of Th(IV) with humic substances have been compiled by Nash and Choppin [35] and revised by Choppin and Allard [36].…”

Section: Introductionmentioning

confidence: 99%

On the study of Th(IV)-humic acid interactions by competition sorption studies with silica and determination of global interaction constants

Reiller¹,

Moulin²,

Casanova³

et al. 2003

Radiochimica Acta

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“…Free Eu had the dominant molecular size of less than 5,000 daltons (67%) and 33% of Eu was found in the molecular size fraction more than 5,000 daltons. The similar result for Eu itself was reported by [26]. If the formation of inorganic colloids or sorption of Eu to the filters occurred in this experiments, we have to take care the treatment of molecular size distribution data.…”

Section: Effects Of Dom On Migration Of Eusupporting

confidence: 88%

Migration Behavior of Eu(III) in Sandy Soil in the Presence of Dissolved Organic Materials

Nagao¹,

Rao

Killey

et al. 1998

Radiochimica Acta

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Migration behavior of Eu(III) in sandy soil in the presence of dissolved organic material (DOM) was studied by the column experiments using a constant feed technique. A site specific DOM, isolated from the groundwater at Chalk River in Canada, a reagent humic acid (HA) from Aldrich Co. Ltd. and Suwannee River HA and River fulvic acid (FA) from the International Humic Substances Society, as reference materials, were used in this study for comparing their effects on the mobility of Eu(III). Solutions of 152 Eu in the presence of the DOMs at pH 5.5 and ionic strength of 0.01 Μ NaC10 4 were introduced onto the column (2.5 cm I.D. X 2.5 cm long) packed with the sandy soil at a constant flow rate of 1.0 mL · min -1 . In the absence of DOM, Eu was not detected even after 90 pore volumes were eluted from the column. Europium elution was observed, however, when any of the DOMs were present. Maximum relative concentrations of Eu were observed in the order: River FA < Groundwater DOM < River HA = Aldrich HA. This sequence suggests that differences in characteristics of DOM may be reflected in mobility of Eu-DOM complexes in sandy soil.

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“…Information about the complexation strength, the number of individual species as well as the chemical environment can be extracted from luminescence data (Binnemans, 2015). In particular, TRLFS (time-resolved laser-induced fluorescence spectroscopy) is a widespread method to characterize Eu bound to various organic substances and minerals (NordÉn et al, 1992;Mathur et al, 2006;Stumpf et al, 2007). However, standard TRLFS-like the analytical methods mentioned above-cannot determine the spatial distribution of the sorbate on the sorbent material.…”

Section: Introductionmentioning

confidence: 99%

Detection and Localization of Eu on Biosilica by Analytical Scanning Electron Microscopy

Hieckmann

Kammerlander

Köhler

et al. 2021

Microscopy and Microanalysis

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Algae like diatoms are widely studied as a means to remediate anthropogenically contaminated sites. In the present study, CL (cathodoluminescence) and EDX (energy-dispersive X-ray) spectroscopy in an SEM (scanning electron microscope) were optimized for the detection of Eu(III) sorbed on diatom biosilica. The required stability of biosilica under a focused electron beam was extensively investigated. Using experimentally determined data of thermal properties, the temperature increase within biosilica exposed to an electron beam was simulated by finite element calculations based on results from Monte Carlo simulations of electron scattering. Complementary thermogravimetric studies substantiated a chemical stability of biosilica in a wide temperature range, confirming its suitability for long-lasting SEM investigations. In subsequent EDX measurements, characteristic Eu lines were detected. Eu was found to preferentially accumulate and aggregate on silica fragments. CL spectra were obtained for the Eu(III) reference material, EuCl3. For Eu-loaded biosilica, even parts without detectable Eu signal in the EDX spectra show significant Eu(III) signals in the CL spectra. This highlights the sensitivity of CL in studying f-element sorption. CL data showed that Eu(III) was distributed on the entire surface. In conclusion, this work demonstrates the merit of CL and EDX methods for sorption studies on biogenic materials.

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A Comparative Study of Europium, Thorium and Uranium Binding to an Aquatic Fulvic Acid

Cited by 5 publications

References 18 publications

On the study of Th(IV)-humic acid interactions by competition sorption studies with silica and determination of global interaction constants

On the study of Th(IV)-humic acid interactions by competition sorption studies with silica and determination of global interaction constants

Migration Behavior of Eu(III) in Sandy Soil in the Presence of Dissolved Organic Materials

Detection and Localization of Eu on Biosilica by Analytical Scanning Electron Microscopy

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