1992
DOI: 10.1524/ract.1992.56.3.141
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Chemistry of Thorium in the Hydrosphere and in the Geosphere

Abstract: The distribution of Th on the molecular fraction, the fine particle (colloid) fraction and the coarse particle fraction in three different groundwaters after equilibration with the corresponding sediments taken at the same places, and the sorption ratios R s of Th in these three groundwater/sediment systems are determined as function of the following parameters : time of equilibration, way of equilibration (smoothly or by shaking), volume to mass ratio V/m, way of separation of groundwater and sediment, variat… Show more

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Cited by 20 publications
(21 citation statements)
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“…A progressive sorption edge is observed, similar to other oxides [19][20][21]23]. Th(IV) is fixed onto silica in neutral pH media, as is it the case in natural medium [27,28]. From his sorption study of Th(IV) onto silica at pH ≤ 3.5, and subsequent SCM fitting, Östhols [10] postulates a bidentate nature of Th(IV) sorbed species on colloidal silica.…”
Section: Sorption Of Thorium Onto Silicamentioning
confidence: 52%
See 1 more Smart Citation
“…A progressive sorption edge is observed, similar to other oxides [19][20][21]23]. Th(IV) is fixed onto silica in neutral pH media, as is it the case in natural medium [27,28]. From his sorption study of Th(IV) onto silica at pH ≤ 3.5, and subsequent SCM fitting, Östhols [10] postulates a bidentate nature of Th(IV) sorbed species on colloidal silica.…”
Section: Sorption Of Thorium Onto Silicamentioning
confidence: 52%
“…As noted in [10], referring to [26], it is difficult to find any vessel material that would allow studies at pH ≥ 3, since tetravalent elements have strong affinities for any surfaces. Clear experimental evidences for a strong sorption of thorium onto silicate mineral surfaces in a large pH range are mentioned in [17,27,28]. In natural systems, tetravalent cations, including Th(IV), are associated with particulate or colloidal matter present in groundwater and their chemistries are not controlled by the precipitation of a single mineral phase [27][28][29][30].…”
Section: Introductionmentioning
confidence: 99%
“…No correlations were noted between the values obtained for the sorption coefficient and rock type or pH (5.3-7.5). The large range in sorption coefficients obtained in these experiments may be explained by the presence of fine colloidal particles in the solution phase used to obtain the sorption coefficients (for example, Lieser and Hill 1992).…”
Section: Thoriummentioning
confidence: 99%
“…Less demonstrably wrong, but certainly a warning signal, are the incredibly short "time in solution before irreversible sorption" values quoted for Th (~0.3-3 seconds). Although the nomenclature is very confusing, such times seem extremely short and differ by many orders of magnitude from times ~ days observed in laboratory studies for Th sorption on sediments [8],…”
Section: Application Of Ku's Modelmentioning
confidence: 94%
“…Equally seriously, the water samples were filtered using only 1 μηι filter cartridges and hence inevitably contain a colloidal component which is completely uncharacterized. Given that Th, in particular, is often present in waters filtered to <450 nm predominantly in a colloidal form (~60 -90%; [7]) and readily associates with such colloids in sorption experiments [8], this calls into question the validity of all subsequent analysis with a model based on the assumption that no colloids are present.…”
Section: Application Of Ku's Modelmentioning
confidence: 99%