Eu(III) and UO{sub 2}{sup 2+} complexation by o-silicic acid
Conference
·
OSTI ID:126703
- Florida State Univ., Tallahassee, FL (United States)
Solvent extraction and fluorescent intensity measurements have been used to obtain stability constant for the complexation of Eu(III) and UO{sub 2}{sup 2+} by o-Si(OH){sub 4} in 0.1 M(NaClO{sub 4}) solution. The values were: for Eu{sup 3+} + OSi(OH){sub 3}{sup -}, log {Beta}{sub 1} = 7.25 {plus_minus} 0.34, log {Beta}{sub 2} = 11.7{plus_minus}0.4; for UO{sub 2}{sup 2+} + OSi(OH){sub 3}{sup -}, log {Beta}{sub 1} = 6.70{plus_minus}0.05. These values fit well in a linear free energy correlation of the log {Beta}{sub i} values of hydrolysis and o-silicate complexation of di- and tri- valent cations. Speciation calculations indicated that Eu-OSi(OH){sub 3} complexes are significant species for natural waters of pH 6 - 7.5 in equilibrium with atmospheric CO{sub 2} and with [o-Si(OH){sub 4}] {>=} 0.03 mM. Silicate complexation of UO{sub 2}{sup 2+} does not compete with hydrolysis and carbonate complexation under these conditions.
- OSTI ID:
- 126703
- Report Number(s):
- CONF-950402--
- Country of Publication:
- United States
- Language:
- English
Similar Records
Uranium(IV) solubility and hydrolysis constants under reduced conditions
A comparative study of europium, thorium and uranium binding to an aquatic fulvic acid
Crystal Structures of Endotaxic Phases in Europium Potassium Silicate Having a Pellyite Unit Cell
Conference
·
Sat Dec 30 23:00:00 EST 1995
·
OSTI ID:382893
A comparative study of europium, thorium and uranium binding to an aquatic fulvic acid
Conference
·
Thu Dec 30 23:00:00 EST 1993
·
OSTI ID:62264
Crystal Structures of Endotaxic Phases in Europium Potassium Silicate Having a Pellyite Unit Cell
Journal Article
·
Sun Nov 14 23:00:00 EST 2010
· Crystallography Reports
·
OSTI ID:22054065