Phosphate Complexation of Gadolinium(III) in Aqueous Solution

Authors

L. S. Bingler, University of South Florida
R. H. Byrne, University of South FloridaFollow

Document Type

Article

Publication Date

1989

Digital Object Identifier (DOI)

https://doi.org/10.1016/S0277-5387(00)86529-8

Abstract

Examination of the distribution of high specific activity Gd¹⁵³ between tributyl phosphate and a 0.68 M aqueous phase at 25.0°C permits investigation of lanthanide phosphate complexation within rigorous solubility constraints. Our experiments provide the following formation constants with estimated standard errors: β′= [GdHPO₄⁺] [Gd³⁺⁻¹I[HPO₄²⁻]⁻¹ = (8.05±0.7) x 10³; β′₂ = [Gd(HPO₄)₂⁻][Gd³⁺]⁻¹ [HPO₄²⁻]⁻ = (8.1± 1.9) x 10⁶; β′_H = [GdH₂PO₄²⁺][Gd³⁺]⁻¹[H₂PO₄⁻]⁻¹ = 50.4 ± 6.8. Our results indicate that phosphate complexation of lanthanide ions and trivalent actinides is significant in natural systems, and that the use of phosphate salts as pH buffers in laboratory examinations of metal hydrolysis is generally inadvisable.

Was this content written or created while at USF?

Yes

Citation / Publisher Attribution

Polyhedron, v. 8, issue 10, p. 1315-1320

Scholar Commons Citation

Bingler, L. S. and Byrne, R. H., "Phosphate Complexation of Gadolinium(III) in Aqueous Solution" (1989). Marine Science Faculty Publications. 1684.
https://digitalcommons.usf.edu/msc_facpub/1684