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- W2891679530 endingPage "164" @default.
- W2891679530 startingPage "143" @default.
- W2891679530 abstract "Monazite (CePO4) is a light rare earth element (REE) phosphate occurring as accessory mineral in metamorphic, igneous and sedimentary rocks, and is also a common mineral in REE mineral deposits. Metasomatism of monazite yields important clues about fluid-rock interaction in the crust, in particular, because its compositional variations may enable us to determine conditions of mineralization. The thermodynamic properties of monazite have been determined using several calorimetric methods, but up to the present time only a few solubility studies have been undertaken, which test the reliability of both, the thermodynamic properties of the REE phosphates and associated REE aqueous species. In this study, we have measured the solubility of the monoclinic REE phosphate end-members CePO4, SmPO4, and GdPO4 in aqueous perchloric acid solutions at temperatures from 100 to 250 °C at saturated water vapor pressure (swvp). The solubility products (Ks0) were determined according to the reaction: REEPO4 = REE3+ + PO43−. Combining available calorimetric data for the REE phosphates with the REE aqueous species from the Supcrt92 (slop98.dat) dataset, yields several orders of magnitude differences when compared with our solubility measurements. We have investigated ways to reconcile these discrepancies and propose a consistent set of provisional thermodynamic properties for REE aqueous species and REE phosphates that reproduce our measured solubility values. To reconcile these discrepancies, we have used the GEMS code package and GEMSFITS for parameter optimization by adjusting the standard Gibbs energy of REE3+ and REEOH2+ at 25 °C and 1 bar. An alternative optimization could involve adjustment of the standard Gibbs energy of REEPO4(s) and REEOH2+. Independently of the optimization method used, this study points to a need to revise the thermodynamic properties of REEOH2+ and possibly other REE hydroxyl species in future potentiometric studies. These revisions will have an impact on calculated solubilities of REE phosphates and our understanding of the mobility of REE in natural hydrothermal fluids." @default.
- W2891679530 created "2018-09-27" @default.
- W2891679530 creator A5022321555 @default.
- W2891679530 creator A5045886855 @default.
- W2891679530 creator A5055854473 @default.
- W2891679530 date "2018-12-01" @default.
- W2891679530 modified "2023-09-23" @default.
- W2891679530 title "The solubility of monazite (CePO4), SmPO4, and GdPO4 in aqueous solutions from 100 to 250 °C" @default.
- W2891679530 cites W1135792483 @default.
- W2891679530 cites W1586931791 @default.
- W2891679530 cites W1752800744 @default.
- W2891679530 cites W1855758874 @default.
- W2891679530 cites W1965874032 @default.
- W2891679530 cites W1967540505 @default.
- W2891679530 cites W1969051824 @default.
- W2891679530 cites W1969859799 @default.
- W2891679530 cites W1971545711 @default.
- W2891679530 cites W1971566370 @default.
- W2891679530 cites W1974308785 @default.
- W2891679530 cites W1975133578 @default.
- W2891679530 cites W1975768912 @default.
- W2891679530 cites W1976571573 @default.
- W2891679530 cites W1984335848 @default.
- W2891679530 cites W1988337184 @default.
- W2891679530 cites W1988567106 @default.
- W2891679530 cites W1991774602 @default.
- W2891679530 cites W1999369100 @default.
- W2891679530 cites W1999891846 @default.
- W2891679530 cites W2004512425 @default.
- W2891679530 cites W2007746229 @default.
- W2891679530 cites W2011748528 @default.
- W2891679530 cites W2014365296 @default.
- W2891679530 cites W2024304865 @default.
- W2891679530 cites W2025572894 @default.
- W2891679530 cites W2026635083 @default.
- W2891679530 cites W2027969547 @default.
- W2891679530 cites W2031057485 @default.
- W2891679530 cites W2038961249 @default.
- W2891679530 cites W2040298946 @default.
- W2891679530 cites W2041219564 @default.
- W2891679530 cites W2041582521 @default.
- W2891679530 cites W2042808380 @default.
- W2891679530 cites W2044473913 @default.
- W2891679530 cites W2044866939 @default.
- W2891679530 cites W2049222240 @default.
- W2891679530 cites W2049452787 @default.
- W2891679530 cites W2050337936 @default.
- W2891679530 cites W2050511855 @default.
- W2891679530 cites W2054191935 @default.
- W2891679530 cites W2054328333 @default.
- W2891679530 cites W2055238891 @default.
- W2891679530 cites W2056945678 @default.
- W2891679530 cites W2059378583 @default.
- W2891679530 cites W2064927687 @default.
- W2891679530 cites W2066527077 @default.
- W2891679530 cites W2068532843 @default.
- W2891679530 cites W2072893132 @default.
- W2891679530 cites W2075335712 @default.
- W2891679530 cites W2076179867 @default.
- W2891679530 cites W2081258920 @default.
- W2891679530 cites W2086071744 @default.
- W2891679530 cites W2087035217 @default.
- W2891679530 cites W2090256770 @default.
- W2891679530 cites W2090609966 @default.
- W2891679530 cites W2094006887 @default.
- W2891679530 cites W2108663754 @default.
- W2891679530 cites W2109317287 @default.
- W2891679530 cites W2111473359 @default.
- W2891679530 cites W2112052324 @default.
- W2891679530 cites W2123142216 @default.
- W2891679530 cites W2125691712 @default.
- W2891679530 cites W2127641354 @default.
- W2891679530 cites W2133678589 @default.
- W2891679530 cites W2135931498 @default.
- W2891679530 cites W2145282805 @default.
- W2891679530 cites W2150712600 @default.
- W2891679530 cites W2153479198 @default.
- W2891679530 cites W2158660715 @default.
- W2891679530 cites W2159194308 @default.
- W2891679530 cites W2161678258 @default.
- W2891679530 cites W2278869065 @default.
- W2891679530 cites W2307060438 @default.
- W2891679530 cites W2313844632 @default.
- W2891679530 cites W2315892471 @default.
- W2891679530 cites W2318936789 @default.
- W2891679530 cites W2323299488 @default.
- W2891679530 cites W2330293686 @default.
- W2891679530 cites W2342811692 @default.
- W2891679530 cites W2345262707 @default.
- W2891679530 cites W2377391324 @default.
- W2891679530 cites W2383660140 @default.
- W2891679530 cites W2408849960 @default.
- W2891679530 cites W2418660277 @default.
- W2891679530 cites W2497033961 @default.
- W2891679530 cites W2507852587 @default.
- W2891679530 cites W2519156516 @default.
- W2891679530 cites W2528166575 @default.
- W2891679530 cites W2530306953 @default.