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

Journal Article · Thu Dec 01 00:00:00 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 Lab. (INL), Idaho Falls, ID (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: DE-AC07-99ID-13727
• OSTI ID: 912175
• Report Number(s): INEEL/JOU-03-00179; JSFLEH; TRN: US200801%%628
• Journal Information: Journal of Supercritical Fluids, Vol. 36, Issue 2; ISSN 0896-8446
• Country of Publication: United States
• Language: English

Related Subjects

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