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Uptake of Cm (III) and Eu (III) by C–S–H phases under saline conditions in presence of EDTA: A batch sorption and TRLFS study

Thumm, Aline K. 1; Skerencak-Frech, Andrej ORCID iD icon 1; Gaona, Xavier ORCID iD icon 1; Altmaier, Marcus ORCID iD icon 1; Geckeis, Horst 1
1 Institut für Nukleare Entsorgung (INE), Karlsruher Institut für Technologie (KIT)

Abstract:

Eu (III) and Cm (III) uptake by calcium silicate hydrate phases (C–S–H) was investigated in presence of EDTA in
NaCl and CaCl2 solutions. Different experimental parameters, i.e., ionic strength (0.1 m ≤ I’m ≤ 5.05 m), ligand
concentration (10 5 m ≤ [EDTA] ≤ 10 2 m), calcium-to-silicon ratio (0.6 ≤ C/S ≤ 1.3) and sorption time (7 d ≤
t ≤ 365 d) were varied in the frame of batch sorption experiments and Time Resolved Laser Fluorescence
spectroscopy (TRLFS) measurements. No effect of EDTA on the retention of Eu(III)/Cm(III) by C–S–H phases in
NaCl or CaCl2 systems was observed at ligand concentrations ≤ 10 3 M. In NaCl solutions with [EDTA] = 10 2 M
and C/S < 1.3, low retention (log Rd = 2–3, with Rd in L•kg 1) of Eu(III) was detected after 7 d of sorption time,
while strong retention (log Rd = 5–6) was observed after 50 d. This behaviour was explained by the initial
stabilization of Eu(III)/Cm(III) in the aqueous phase due to the formation of two aqueous Eu(III)/Cm(III)-(OH)n-
EDTA complexes, followed by the slow incorporation of Eu(III)/Cm(III) into the C–S–H structure. In CaCl2 so-
lutions for all C/S ratios, as well as in NaCl solutions for C/S ~ 1.3, the presence of [EDTA] = 10 2 M led to a
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Zugehörige Institution(en) am KIT Institut für Nukleare Entsorgung (INE)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 09.2024
Sprache Englisch
Identifikator ISSN: 0883-2927, 1872-9134
KITopen-ID: 1000172629
HGF-Programm 32.11.01 (POF IV, LK 01) Nuclear Waste Disposal
Erschienen in Applied Geochemistry
Verlag Elsevier
Band 170
Seiten 106087
Vorab online veröffentlicht am 28.06.2024
Nachgewiesen in Dimensions
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Verlagsausgabe §
DOI: 10.5445/IR/1000172629
Veröffentlicht am 23.07.2024
Seitenaufrufe: 44
seit 23.07.2024
Downloads: 17
seit 17.08.2024
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