Incorporation of strontium and europium in crystals of α-calcium isosaccharinate

Chen, SongKTH,Resursåtervinning,KTH Royal Inst Technol, Dept Chem Engn, Teknikringen 42, S-10044 Stockholm, Sweden (författare)

QC 20181010
The final repository for short-lived, low and intermediate level radioactive waste in Sweden is built to act as a passive repository. Already within a few years after closure water will penetrate the repository and conditions of high alkalinity (pH 10.5―13.5) and low temperature (< 7 °C) will prevail. The mobility of radionuclides in the repository is dependent on the radionuclides distribution between solid and liquid phases. In the present work the incorporation of strontium (II) and europium (III) in α-calcium isosaccharinate (ISA) under alkaline conditions (pH ~10) at 5 °C and 50 °C have been studied. The results show that strontium and europium are incorporated into α-Ca(ISA)2 when crystallized both at 5 °C and 50 °C. Europium is incorporated to a greater extent than strontium. The highest incorporation of europium and strontium at 5 °C rendered the phase compositions Ca0.986Eu0.014(ISA)2 (2.4% of Eu(ISA)3 by mass) and Ca0.98Sr0.02(ISA)2 (2.2% of Sr(ISA)2 by mass). XPS spectra show that both trivalent and divalent Eu coexist in the Eu incorporated samples. Strontium ions were found to retard the elongated growth of the Ca(ISA)2crystals. The incorporation of Sr2+ and Eu3+ into the solid phase of Ca(ISA)2 is expected to contribute to a decreased mobility of these ions in the repository.

Abdel-Magied, Ahmed FawzyKTH,Resursåtervinning,KTH Royal Inst Technol, Dept Chem Engn, Teknikringen 42, S-10044 Stockholm, Sweden(Swepub:kth)u1nluog8 (författare)
Fu, LeUppsala universitet,Tillämpad materialvetenskap,Uppsala Universitet, Department of Engineering Sciences(Swepub:uu)leafu433 (författare)
Jonsson, Mats,1967-KTH,Kemi,KTH Royal Inst Technol, Dept Chem, Stockholm, Sweden(Swepub:kth)u11mc94v (författare)
Forsberg, Kerstin,1979-KTH,Resursåtervinning,KTH Royal Inst Technol, Dept Chem Engn, Teknikringen 42, S-10044 Stockholm, Sweden(Swepub:kth)u1dfmuzo (författare)
KTHResursåtervinning (creator_code:org_t)

Ingår i:Journal of Hazardous Materials: Elsevier364, s. 309-3160304-38941873-3336

Av författaren/redakt...: Chen, Song; Abdel-Magied, Ah ...; Fu, Le; Jonsson, Mats, 1 ...; Forsberg, Kersti ...

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