Investigation of complexation of thorium by humic acid using chemically immobilized humic acid on silica gel

Szabó, Gy.; Guczi, Judit; Reiller, Pascal E.; Geckeis, Horst; Bulman, Robert A.

doi:10.1524/ract.2006.94.9-11.553

Cited by 12 publications

(18 citation statements)

References 27 publications

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“…Complementary to data obtained in the late seventies and early eighties [23][24][25], more data were recently obtained on Th(IV) [26][27][28][29][30], U(IV) [31,32], and Pu(IV) [33]. Transport experiments of U(IV) were also recently obtained [34], evidencing high interaction with HS.…”

Section: Introductionmentioning

confidence: 53%

“…Szabó et al worked in a wider pH range using silica grafted humic acids [29,30,33]. The isotherms were constructed varying the ratio An(IV), i.e.…”

Section: Compilation Of Datamentioning

confidence: 99%

“…1. Compilation of data for the An(IV)-HA systems; for Th(IV), [23], [24], [26] referring to hydrolysis in [65], and [28], and [29,30], this study referring to hydrolysis in [52]; for uranium(IV), and U(IV) [32] referring to hydrolysis in [51]; for Pu(IV) + LBHA [25], Pu(IV) on SiO 2 -HA [33] referring to hydrolysis in [47]. the other Th(IV) were recalculated referring to [52].…”

Section: Compilation Of Datamentioning

confidence: 99%

“…The only data that can be reinterpreted with a reasonable level of confidence are the ones that are documented in the Brought to you by | New York University Bobst Library Technical Services Authenticated Download Date | 5/30/15 1:12 PM Th-SiO 2 -Aldrich HA, pH isotherm [28]; Th-SiO 2 grafted HA [29,30], [30]; PuSiO 2 grafted HA [33];…”

Section: Conditional Stability Constantsmentioning

confidence: 99%

“…original articles or PhD theses. It means that only the data for Aldrich HA in [23,58], and the data from [19,28,29,32], and the data proposed here can be used for these calculations. For the other data, estimation can be proposed assuming that:…”

Section: Conditional Stability Constantsmentioning

confidence: 99%

See 4 more Smart Citations

Complexation parameters for the actinides(IV)-humic acid system: a search for consistency and application to laboratory and field observations

Reiller¹,

Evans²,

Szabó³

2008

Radiochimica Acta

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SummaryThe coherence of actinide(IV) complexation by humic substances (HS) is reviewed and new data are proposed. In a first attempt, the values of independent data from literature on Th(IV), U(IV), and Pu(IV) are collected, selected, and compiled. The data obtained follow the “classical” trend of increasing conditional formation “constants” with pH, led both by the increasing ionisation of HS and by the extensive hydrolysis of the tetravalent actinides. Even though a fair agreement is evident, the experimental uncertainties do not permit a full analogy between the actinides(IV) to be ascertained. In a second attempt, the experiments from which the original data are available were reinterpreted using only one hydrolysis constant set for U(IV) as an example, considering that all actinides(IV) have analogous humic complexation behaviour. Hence, the obtained evolution of conditional formation “constants” is much more coherent and the uncertainties do not permit to distinguish an actinide(IV) from one another. The obtained data are then applied to independent laboratory and

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