A Comparative Spectroscopic Study of the Fulvate Complexation of Trivalent Transuranium Ions

Buckau, G.; Kim, J. I.; Klenze, R.; Rhee, Dong Seok; Wimmer, H.

doi:10.1524/ract.1992.57.23.105

Cited by 58 publications

(49 citation statements)

References 18 publications

(31 reference statements)

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“…Brought to you by | New York University Bobst Library Technical Services Authenticated Download Date | 7/17/15 10:54 AM This value is somewhat higher than that of the corresponding fulvic acid isolated from the same groundwater [17]: log/? = 5.86 + 0.11 for Am or Cm fulvate.…”

Section: The Complexation Study By Ultrafiltrationmentioning

confidence: 77%

Complexation of Trivalent Actinide Ions (Am³⁺, Cm³⁺) with Humic Acid: A Comparison of Different Experimental Methods

Kim

Rhee²,

Wimmer³

et al. 1993

Radiochimica Acta

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The complexation of trivalent metal ions with humic acid has been studied at pH 4 and 5 in 0.1 Μ NaC10 4 by three different experimental methods, i.e. UV spectroscopy, time resolved laser fluorescence spectroscopy (TRLFS) and ultrafiltration. The direct speciation of the metal ion and its humate complex in the reaction process has been made by UV spectroscopy for Am(III) in the micromolar concentration range and by TRLFS for Cm(III) in the nanomolar concentration range. The ultrafiltration is used with the lowest pore size of filter (ca. 1 nm) to separate the uncomplexed metal ion from its complexed species. The concentrations of both metal ion and humic acid are varied in such a manner that the effective functional groups of the humic acid becomes loaded with metal ions from 1 % to nearly 100%. The loading capacity of the humic acid for the trivalent metal ion, determined separately at each pH, is introduced into the evaluation of complexation constants. The variation of the metal ion concentration from 6 χ 10" 8 mol/1 to 4 χ 10" 5 mol/1 does not show any effect on the complexation reaction. The three different methods give rise to constants being comparable with one another. The average value of the constants thus determined is log β = 6.24 + 0.28 for the trivalent actinide ions.

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Section: The Complexation Study By Ultrafiltrationmentioning

confidence: 77%

Complexation of Trivalent Actinide Ions (Am³⁺, Cm³⁺) with Humic Acid: A Comparison of Different Experimental Methods

Kim

Rhee²,

Wimmer³

et al. 1993

Radiochimica Acta

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“…The complexation of Cm(III) with humic and fulvic acids of different origin has been studied by TRLFS [15,16]. Fig.…”

Section: Húmate Complexationmentioning

confidence: 99%

“…Fig. 3 shows the emission spectra taken at pH 6.0 for the aqueous Cm 3 + ion, its húmate and In contrast to the aqueous ion, hydrolysed species and carbonate complexes, the Cm 3+ ion bound to humic or fulvic acid shows sensitized emission due to energy transfer from photoexcited humic or fulvic acid [15,16]. The energy transfer facilitates a selective excitation of Cm húmate by the excimer laser at 308 nm.…”

Section: Húmate Complexationmentioning

confidence: 99%

A Direct Speciation of Cm(III) in Natural Aquatic Systems by Time-Resolved Laser-Induced Fluorescence Spectroscopy (TRLFS)

1992

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A direct speciation of Cm(III) traced in three different Gorleben groundwaters is performed by time resolved laser fluorescence spectroscopy (TRLFS) in very dilute concentrations from 7.8 χ 10~9 mol 1" 1 to 6.3 χ IO" 8 mol Γ 1 , which are below the solubility of Cm(III) at the given aquatic neutral pH. As spectroscopic references, fluorescence spectra are produced for individual hydroxides, carbonates, húmate and fulvate of Cm(III). Parallel to the spectroscopic speciation, a thermodynamic speciation is also made based on complexation constants of the predominant aquatic chemical reactions, i.e. hydrolysis, carbonate complexation and húmate complexation. The speciation results from thermodynamic calculation and spectroscopy are compared with one another.

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“…Based on these, the Dlog K values in this study were compared with those given in the literature at the same conditions of pH and C M /C L . For this condition, the data for the binding of Am 3þ to the groundwater HSs in Gorleben, Germany, were only available in the literature [3,35,36]. The Dlog K values for the Horonobe and Gorleben groundwater HSs are summarized in Table 4.…”

Section: Comparisons With Deep Groundwater Hss From Different Aquifermentioning

confidence: 99%

Europium-binding abilities of dissolved humic substances isolated from deep groundwater in Horonobe area, Hokkaido, Japan

Terashima

Nagao

Iwatsuki

et al. 2012

Journal of Nuclear Science and Technology

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The binding of europium to dissolved humic substances (HSs), isolated from deep groundwater in the Horonobe area, Hokkaido, Japan, was evaluated by means of a three-dimensional fluorescence quenching technique. The Ryan and Weber model, extended by the charge neutralization model, was applied to the fluorescence quenching profiles to evaluate the conditional binding constants (K) at pH 5.0 and an ionic strength of 0.1. The K values for fulvic (FA) and humic acids (HA) in the Horonobe groundwater were comparable with each other regardless of the position of the fluorescence peaks. As compared with HSs from Lake Biwa, Aldrich, and Dando soil, the K values of the Horonobe groundwater HSs were the smallest, indicating that the Horonobe groundwater HSs have a lower affinity for the binding of europium compared to the HSs from surface environments. In addition, the results of the Aldrich-based comparison indicate that the Horonobe groundwater HSs have a lower binding affinity for trivalent lanthanides/actinides compared with other groundwater HSs obtained from different aquifer. These findings demonstrate that the characteristics and origin of deep groundwater HSs needs to be taken into consideration assessing the effects of HSs on the speciation of radionuclides in deep groundwater in geological disposal systems.

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A Comparative Spectroscopic Study of the Fulvate Complexation of Trivalent Transuranium Ions

Cited by 58 publications

References 18 publications

Complexation of Trivalent Actinide Ions (Am³⁺, Cm³⁺) with Humic Acid: A Comparison of Different Experimental Methods

Complexation of Trivalent Actinide Ions (Am³⁺, Cm³⁺) with Humic Acid: A Comparison of Different Experimental Methods

A Direct Speciation of Cm(III) in Natural Aquatic Systems by Time-Resolved Laser-Induced Fluorescence Spectroscopy (TRLFS)

Europium-binding abilities of dissolved humic substances isolated from deep groundwater in Horonobe area, Hokkaido, Japan

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A Comparative Spectroscopic Study of the Fulvate Complexation of Trivalent Transuranium Ions

Cited by 58 publications

References 18 publications

Complexation of Trivalent Actinide Ions (Am3+, Cm3+) with Humic Acid: A Comparison of Different Experimental Methods

Complexation of Trivalent Actinide Ions (Am3+, Cm3+) with Humic Acid: A Comparison of Different Experimental Methods

A Direct Speciation of Cm(III) in Natural Aquatic Systems by Time-Resolved Laser-Induced Fluorescence Spectroscopy (TRLFS)

Europium-binding abilities of dissolved humic substances isolated from deep groundwater in Horonobe area, Hokkaido, Japan

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Complexation of Trivalent Actinide Ions (Am³⁺, Cm³⁺) with Humic Acid: A Comparison of Different Experimental Methods

Complexation of Trivalent Actinide Ions (Am³⁺, Cm³⁺) with Humic Acid: A Comparison of Different Experimental Methods