caa a22 4500 378867598 CHVBK 20180305123401.0 cr unu---uuuuu 161128e20030401xx s 000 0 eng 10.1524/ract.91.4.203.19972 doi (NATIONALLICENCE)gruyter-10.1524/ract.91.4.203.19972 Solubility of thorium from Th3UO8 and ZrTh3UO10 ceramics [Elektronische Daten] [G. Curran, W. Rattray, K.R. Czerwinski] The solubility of thorium from Th3UO8 and ZrTh3UO10 ceramics was studied to evaluate the solubility constants for the materials. Zirconium was added in order to investigate potential additional stabilization of the thorium matrix from ZrO2. Studies were performed from pH 4 to pH 9 under both 100 Argon and 10 CO2/90 Ar at 25°C in 0.1M NaClO4. Reaction kinetics and equilibrium concentrations were evaluated for each condition. Rate constants increased with pH and varied from 6×10-4 hr-1 to 4×10-2 hr-1. The surface area normalized dissolution rate decreased with increasing pH, the highest being 5×10-7gm-2 d-1 at pH 4. The solubility product constants calculated from the equilibrium concentrations for the two ceramics were equivalent, with K{spTh₃UO₈}= -48.30.4 and K{spZrTh₃UO₈= -47.90.9. The data was used to calculate the Th solution phase concentration. The result was compared to the dissolution of UO2 from pH 5-9 in 0.1M NaClO4 under a 1 CO2 atmosphere at 25°C. It was found that the U from the UO2 had a higher solution phase concentration than Th at high pH and was highly dependent upon the solution Eh of the evaluated conditions. © 2003 Oldenbourg Wissenschaftsverlag GmbH Laboratory techniques, experiments nationallicence Analytical chemistry nationallicence Inorganic chemistry nationallicence Curran G. aut Rattray W. aut Czerwinski K.R. aut Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 91/4/2003(2003-04-01), 203-210 0033-8230 91:4/2003<203 2003 91 ract https://doi.org/10.1524/ract.91.4.203.19972 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1524/ract.91.4.203.19972 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Curran G. aut NATIONALLICENCE 700 1- Rattray W. aut NATIONALLICENCE 700 1- Czerwinski K.R. aut NATIONALLICENCE 773 0- Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 91/4/2003(2003-04-01), 203-210 0033-8230 91:4/2003<203 2003 91 ract CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter