The thermodynamics and kinetics of uranophane dissolution in bicarbonate test solutions

Details The thermodynamics and kinetics of uranophane dissolution in bicarbonate test solutions The thermodynamics and kinetics of uranophane dissolution in bicarbonate test solutions

Feb 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000gecoa..64..603p&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 64, Issue 4, pp.603-608

Physics

4

Scientific paper

The thermodynamic and kinetic properties of a synthetic uranophane (Ca(H 3 O) 2 (UO 2 ) 2 (SiO 4 ) 2 · 3H 2 O) have been determined from dissolution experiments in test solutions of different bicarbonate concentrations at 25°C. The experiments were performed using batch and continuously stirred tank flow-through reactors. From the experimental data obtained with the batch reactor the solubility constant for the reaction: Ca(H 3 O) 2 (UO 2 ) 2 (SiO 4 ) 2 · 3H 2 O + 6H 3 O + Ca +2 + 2UO 2 +2 + 2H 4 SiO 4 + 11H 2 O was determined to be log K s 0 0 = 11.7 ± 0.6 and the rate equation for the dissolution process is log r dissol (mol s -1 m -2 ) = -8.3 (±0.6) + 0.7 (±0.3) log [HCO 3 - ]. By using the continuously stirred tank flow-through reactor we obtained a rate equation in reasonably good agreement with that obtained in the batch reactor: log r dissol (mol s -1 m -2 ) = -9.2 (±0.4) + 0.7 (±0.2) log [HCO 3 - ].

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