Initial assessment of hydrous Thorium(IV) solubility and speciation in geological environments: An experimental approach in presence of organic ligands

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dc.contributor.authorCetiner, Ziya S.
dc.date.accessioned2025-01-27T20:22:32Z
dc.date.available2025-01-27T20:22:32Z
dc.date.issued2007
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractData on the hydrolysis of Thorium(IV) and solubility of ThO2 in presence of organic ligands are of critical importance to the safe disposal and treatment of high-level nuclear waste. Such data are required to predict reliably thorium behaviour in high-level waste repositories where organic anions may be present. In addition, Th(IV) is considered to be a chemical analogue of tetravalent actinides such as Pu(IV). To establish the effect of pH and organic ligands on the hydrolysis of Th(IV), experiments on the solubility of hydrous ThO2 in aqueous solution at room temperature were performed, covering a wide range of pH (pH = 3-12) in 0.1 molal NaNO3 solutions. Experiments also were conducted in the presence of citrate, oxalate and EDTA with a concentration range of 100-500 mu mol. The solubility of ThO2 decreases with increase of pH (pH 3 to 6) and remains near the detection limit of ICP-MS (10(-9)-10(-10) M) in the range pH 6-12. These values are in accordance with data in the literature. The solubility of ThO2 does-not appear to be a sensitive function of the concentration of the investigated organic ligands at any given pH providing the fact that bulk of organic ligands is potentially absorbed by ThO2 solid phase. Thorium concentrations obtained from unfiltered and filtered samples showed almost an order of magnitude variation in molal concentration indicating a significant amount of colloid formation.
dc.identifier.endpage3238
dc.identifier.issn0970-7077
dc.identifier.issue4
dc.identifier.scopus2-s2.0-53949123533
dc.identifier.scopusqualityQ4
dc.identifier.startpage3228
dc.identifier.urihttps://hdl.handle.net/20.500.12428/21937
dc.identifier.volume19
dc.identifier.wosWOS:000251463400109
dc.identifier.wosqualityQ4
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherAsian Journal Of Chemistry
dc.relation.ispartofAsian Journal of Chemistry
dc.relation.publicationcategoryinfo:eu-repo/semantics/openAccess
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WoS_20250125
dc.subjectthorium oxide
dc.subjectsolubility
dc.subjectorganic ligands
dc.subjectdissolution
dc.titleInitial assessment of hydrous Thorium(IV) solubility and speciation in geological environments: An experimental approach in presence of organic ligands
dc.typeArticle

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