Computer Science
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gecoa..58..613o&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 58, Issue 2, pp.613-623
Computer Science
3
Scientific paper
The solubility of microcrystalline ThO 2 as a function of pH has been studied under different partial pressures of CO 2 in aqueous media, in order to obtain qualitative and quantitative information on the complexation of Th 4+ with carbonate. Based on the results of the study, the existence of a mixed thorium-hydroxo-carbonate complex, Th(OH) 3 CO 3 - , as well as a thorium carbonate complex Th(CO 3 ) 5 6- is proposed and their stability constants and the solubility product of microcrystalline thorium dioxide (ThO 2 (act)) are determined. The following equilibrium constants were determined in 0.5 M NaClO 4 at 25°C 1 atm.: ThO 2 (act) + 4 H + Th 4+ + 2 H 2 O log K s = 9.37 ± 0.13 ThO 2 (act) + H + + H 2 O + CO 3 2- Th ( OH ) 3 CO 3 - log 1,3,1 = 6.11 ± 0.19 ThO 2 (act) + 4 H + + 5 CO 3 2- Th ( CO 3 ) 5 6- log 1,0,5 = 42.12 ± 0.32. The errors are given as three standard deviations in the fitted constants. By extrapolation, the following constants are obtained for the infinite dilution standard state: ThO 2 (act) + 4 H + Th 4+ + 2 H 2 O log K s = 7.31 ± 0.3 ThO 2 (act) + H + + H 2 O + CO 3 2- Th ( OH ) 3 CO 3 - log 1,3,1 = 6.78 ± 0.3 ThO 2 (act) + 4 H + + 5 CO 3 2- Th ( CO 3 ) 5 6- log 1,0,5 = 39.64 ± 0.4.
Bruno Jordi
Grenthe Ingmar
Östhols Erik
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