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Solubility, redox and sorption behavior of plutonium in the presence of α-D-isosaccharinic acid and cement under reducing conditions

Tasi, Agost Gyula

Abstract (englisch):
Nuclear waste is planned to be embedded in deep underground facilities within suitable host rock formations. In the post-operational phase, ground water may intrude from the surrounding rock and saturate the repository. The present cementitious materials, used frequently for construction and waste conditioning purposes, will buffer the pH in the alkaline range (10 ≤ pH ≤ 13.3) over a very long time-scale, whereas strongly reducing conditions are expected to simultaneously evolve in the system due to the anaerobic corrosion processes of steel and related materials.
Plutonium in the waste inventory potentially contributes to the long–term radiological risk arising from the long half–life of 239Pu (t½ 239Pu = 2.41∙104 a). In reducing, aqueous environments, the formation of Pu(III) and Pu(IV) is foreseen. However, uncertainties in the available thermodynamic data lead to a rather ill–defined redox transition border, especially under alkaline to hyperalkaline pH conditions.
Large quantities of cellulosic materials may also be disposed of along with low- and intermediate-level nuclear waste (L/ILW). Under alkaline, Ca(II)-rich aqueous solutions, these materials are unstable and observed to decompose into smaller chained organic compounds. ... mehr

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Volltext §
DOI: 10.5445/IR/1000082526
Veröffentlicht am 02.08.2018
Zugehörige Institution(en) am KIT Institut für Nukleare Entsorgung (INE)
Publikationstyp Hochschulschrift
Jahr 2018
Sprache Englisch
Identifikator urn:nbn:de:swb:90-825262
KITopen-ID: 1000082526
HGF-Programm 32.01.01 (POF III, LK 01)
Verlag KIT, Karlsruhe
Umfang XXX, 256 S.
Abschlussart Dissertation
Fakultät Fakultät für Chemie und Biowissenschaften (CHEM-BIO)
Institut Institut für Nukleare Entsorgung (INE)
Prüfungsdatum 16.04.2018
Referent/Betreuer Prof. H. Geckeis
Schlagworte Plutonium, cellulose, isosaccharinic acid, aquatic chemistry, solubility, complexation, thermodynamics
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