Marine Science Faculty Publications

Rare Earth Element Complexation by Fluoride Ions in Aqueous Solution

Document Type

Article

Publication Date

1993

Keywords

Rare earth elements, fluoride complexation, stability constant, solvent exchange, tributyl phosphate, sodium perchlorate

Digital Object Identifier (DOI)

https://doi.org/10.1007/BF00647414

Abstract

Rare earth fluoride stability constants for Ce, Eu, Gd, Tb and Yb at 25°C have been determined by examining the influence of fluoride ions on the distribution of rare earths between tributyl phosphate (TBP) and 0.68M NaClO4. Our results indicate that rare earth mono and difluoro complexation constants show a steady increase as a function of atomic number from La to Tb but remain relatively constant after Dy. This behavior is similar to that which has been observed for dicarboxylic acids. Stepwise stability constant ratios, K2/K1, obtained in our work (where K1=[MF2+][M3+]−1[F−]−1 and K2=[MF +2 ]−1[MF2+]−1[F−]−1) indicated that, for all rare earths, K2/K1=0.09±0.03.

Was this content written or created while at USF?

Yes

Citation / Publisher Attribution

Journal of Solution Chemistry, v. 22, p. 751-766

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