Experimental Determination and Modeling of the Speciation of Uranium(VI) in Phosphoric Acid Medium. Issue 3 (15th April 2016)

• Record Type: Journal Article
• Authors: Dartiguelongue, Adrien; Provost, Elise; Chagnes, Alexandre; Cote, Gérard; Fürst, Walter
• Is Part Of: Solvent extraction and ion exchange. Volume 34:Issue 3(2016)
• Page Start: 241
• Page End: 259
• Publication Date: 2016-04-15
• Subjects: Phosphoric acid -- IR spectroscopy -- speciation -- modeling -- equation of state (EoS) -- electrolytes -- uranium(VI); Solvent extraction -- Periodicals; Ion exchange -- Periodicals; 660.284248
• DOI: 10.1080/07366299.2016.1169145
• Languages: English
• ISSNs: 0736-6299

Abstract

ABSTRACT: Phosphoric acid solutions with 0 < [H3 PO4 ] < 8 mol · L −1 and 0 < U(VI) < 2 mol · L −1 are studied by Infra Red (IR) spectroscopy and modelized using an equation of state adapted for electrolytes. Modeling of H3 PO4 solutions without uranium, based on a data set combining literature data and original IR measurement, shows that the dimer H5 P2 O8 − has to be considered for H3 PO4 apparent concentration higher than 1 mol · L −1 . When uranium(VI) is present and in the considered concentration range, the results of the data treatment are consistent with the existence of three complexes: UO2 (H2 PO4 ) +, UO2 (H2 PO4 )2, and UO2 (H3 PO4 )(H2 PO4 )2, the last two ones being largely predominant.