Comparative Carbonate Complexation of Yttrium and Gadolinium at 25 °C and 0.7 Mol Dm⁻³ Ionic Strength

Authors

Xuewu Liu, University of South FloridaFollow
Robert H. Byrne, University of South FloridaFollow

Document Type

Article

Publication Date

1995

Digital Object Identifier (DOI)

https://doi.org/10.1016/0304-4203(95)00067-4

Abstract

Stability constants for yttrium and gadolinium complexation by carbonate ions have been measured by solvent extraction procedures at 25 °C and 0.7 mol dm⁻³ ionic strength. The results of six experiments indicate that log_CO3β₁′(Y) = 5.71, log_CO3β₂′(Y) = 10.34, log_CO3β₁′(Gd) = 5.65 and log_CO3β₂′(Gd) = 10.12 where_CO3β_n′(M) = [M(CO₃)_n^{3 − 2n}][M³⁺]⁻¹[CO₃²⁻]_T⁻ⁿ, [ ] represents concentrations and [CO₃²⁻]_T = [CO₃²⁻] + [NaCO₃⁻]. When compared with previous complexation results for Eu³⁺, Gd³⁺ and Tb³⁺ obtained using identical procedures, excellent agreement is observed for Gd³⁺ complexation, and the solution complexation of Y³⁺ in seawater is seen to closely resemble that of Tb³⁺. In spite of closely linked solution chemistries of Y³⁺ and Tb³⁺, the shale normalized concentrations of these elements in seawater should be distinct due to their differing reactivities with organic ligands on particle surfaces. Model calculations indicate that while shale normalized Y³⁺ concentrations in seawater may exceed the shale normalized concentrations of all rare earths, similarities in Y³⁺ and Tb³⁺ solution chemistries may produce substantial coherence in the oceanic distributions of these elements.

Was this content written or created while at USF?

Yes

Citation / Publisher Attribution

Marine Chemistry, v. 51, issue 3, p. 213-221

Scholar Commons Citation

Liu, Xuewu and Byrne, Robert H., "Comparative Carbonate Complexation of Yttrium and Gadolinium at 25 °C and 0.7 Mol Dm⁻³ Ionic Strength" (1995). Marine Science Faculty Publications. 1706.
https://digitalcommons.usf.edu/msc_facpub/1706