Holmium Nitrate Complexation with Tri-n-butyl Phosphate in Supercritical Carbon Dioxide

Journal Article · Thu Dec 01 04:00:00 EST 2005 · Journal of Supercritical Fluids

DOI:https://doi.org/10.1016/j.supflu.2005.05.003· OSTI ID:912175

Fox, Robert V; Ball, R Duane; B Harrington, Peter de; Rollins, Harry W; Wai, Chien M

Holmium nitrate pentahydrate was reacted with tri-n-butyl phosphate in supercritical carbon dioxide at 308 K. The products of the complexation reaction were measured under supercritical fluid conditions using UV-vis spectroscopy. The solubility of the metal complexes in the supercritical fluid phase was measured. The mole-ratio titration method was used to determine the stoichiometry of the soluble complexes. Conditional extraction coefficients were calculated from spectral data using least-squares regression and hard-equilibria models. Data indicate that the holmium nitrate-tributyl phosphate system forms 1:2 and 1:4 holmium-tributyl phosphate complexes.

• Research Organization: Idaho National Laboratory (INL)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC07-99ID13727
• OSTI ID: 912175
• Report Number(s): INEEL/JOU-03-00179
• Journal Information: Journal of Supercritical Fluids, Journal Name: Journal of Supercritical Fluids Journal Issue: 2 Vol. 36; ISSN JSFLEH; ISSN 0896-8446
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
CARBON DIOXIDE
HOLMIUM
HOLMIUM NITRATES
Lanthanides
Metal Complexation
Multivariate Hard Equilibria Modeling
PHOSPHATES
SIMPLISMA
SOLUBILITY
SPECTROSCOPY
STOICHIOMETRY
Supercritical Carbon Dioxide
TITRATION