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Solubility of Ca( ii ), Ni( ii ), Nd( iii ) and Pu( iv ) in the presence of proxy ligands for the degradation of polyacrylonitrile in cementitious systems

Szabo, P. G. 1; Tasi, A. G. 1; Gaona, X. ORCID iD icon 1; Polly, R. ORCID iD icon 1; Maier, A. C.; Hedström, S.; Altmaier, M. ORCID iD icon 1; Geckeis, H. 1
1 Institut für Nukleare Entsorgung (INE), Karlsruher Institut für Technologie (KIT)

Abstract:

The solubility of Ca(OH)$_{2}$(cr), β-Ni(OH)$_{2}$(cr), Nd(OH)$_{3}$(s) and PuO$_{2}$(ncr, hyd) was investigated in cement porewater solutions containing glutarate (GTA), α-hydroxyisobutarate (HIBA) and 3-hydroxybutarate (HBA). These ligands were proposed as probable degradation products of UP2W, a polyacrylonitrile-based filter aid used in nuclear power plants. Results obtained in this work are compared with reported solubility data in the presence of iso-saccharinic acid (ISA), a polyhydroxocarboxylic acid resulting from cellulose degradation. None of the investigated proxy ligands shows any significant impact on the solubility of Ca(II), Nd(III) or Pu(IV) in cement porewater solutions. Although the formation of binary complexes M–L (M = Ca(II), Nd(III), An(IV); L = GTA, HIBA, HBA) under acidic conditions is described in the literature, these organic ligands cannot outcompete hydrolysis under hyperalkaline conditions. GTA, HIBA and HBA induce a slight increase in the solubility of β-Ni(OH)$_{2}$(cr) at [L]$_{tot}$ = 0.1 M. This observation supports the formation of stable Ni(II)–GTA, –HIBA and –HBA complexes in hyperalkaline conditions, although the exact stoichiometry of these complexes remains unknown. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000148605
Originalveröffentlichung
DOI: 10.1039/d2dt01409b
Scopus
Zitationen: 1
Web of Science
Zitationen: 1
Dimensions
Zitationen: 3
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nukleare Entsorgung (INE)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 21.06.2022
Sprache Englisch
Identifikator ISSN: 1477-9226, 1477-9234
KITopen-ID: 1000148605
HGF-Programm 32.11.03 (POF IV, LK 01) Fundamental Scientific Aspects
Erschienen in Dalton Transactions
Verlag Royal Society of Chemistry (RSC)
Band 51
Heft 24
Seiten 9432–9444
Vorab online veröffentlicht am 30.05.2022
Nachgewiesen in Scopus
Dimensions
Web of Science
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