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Stefan Allard, Christian Ekberg

Complexing properties of α-isosaccharinate: thorium

Keywords: Thorium, α-Isosaccharinate, Complexation, Stability constants, Liquid-liquid extraction

The complexation of Th with α-isosaccharinate has been studied using liquid–liquid-extraction techniques. An organic phase consisting of 0.025 M acetylacetone in toluene was used with a 1.0 M NaClO₄ aqueous phase kept at pH 8 in a thermostated AKUFVE unit at 25 °C. The concentration of α-isosaccharinate (ISA^-) in the aqueous phase was incrementally increased and samples of equal volumes were taken from the two phases and analyzed in a liquid scintillation detector. Stability constants, β _p^t , for the complexation reaction Th⁴⁺+p ISA^-↔Th(ISA)_p^(4-p)+, were determined to be logβ₁²⁵°C=12.56±5.01, logβ₂²⁵°C=19.38+0.35/-0.95, and logβ₃²⁵°C=21.30±0.26.

Radiochimica Acta, Oldenbourg Wissenschaftsverlag

Print ISSN: 0033-8230
Volume: 94, 09/2006
Pages: 537 - 540

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