Actions for Development of an experimental data base and theories for prediction of thermodynamic properties of aqueous electrolytes and nonelectrolytes of geochemical significance at supercritical temperatures and pressures. Annual performance report [electronic resource].

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Development of an experimental data base and theories for prediction of thermodynamic properties of aqueous electrolytes and nonelectrolytes of geochemical significance at supercritical temperatures and pressures. Annual performance report [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 1992.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
20 pages : digital, PDF file
Additional Creators
University of Delaware, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
This project is divided into method experimental measurements, theoretical development, and geochemical applications. We have completed experimental volumetric measurements on aqueous solutions of CO₂ H₂S, CH₄, NH₃ and B(OH)₃ at 25 to 432°C and 280 and 350 bar. A vibrating tube densitometer that allows density measurements near bubble point and also measures the bubble pressure was developed and used to measure densities and bubble pressures of aqueous Co₂. Heat capacity measurements should be completed by the end of the grant period. Simulations of models for methane in water at temperatures to 1000°C are in progress. In order to facilitate these free energy calculations the possible errors associated with the calculations have been explored in two papers (Wood, 1991; Wood et al., 1991) and methods of controlling and estimating these errors have been developed. Applications of the new data to geochemical processes is now possible. Efforts have focussed on extracting equilibrium constants for carbonic acid dissociation at supercritical condition from published experiments on mineral equilibria in H₂O-CO₂ fluids (Boehlke and Shock, 1990; and in prep.). As a result, estimates of pKa for carbonic acid are now available at temperatures from 300 to 750°C and pressures from 1 to 7 kilobars. They will be combined with {bar V}{sup °} and {bar C}p{sup °} data for CO²(aq) to improve geochemical calculations.
Report Numbers
E 1.99:doe/er/14080--3
doe/er/14080--3
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Other Subject(s)
Note
Published through SciTech Connect.
02/24/1992.
"doe/er/14080--3"
"DE92040856"
Wood, R.H.; Shock, E.L.; Hnedkovsky, L.; Lin, Ching Lung.
Type of Report and Period Covered Note
Annual; 12/31/1992 - 12/31/1992
Funding Information
FG02-89ER14080
View MARC record | catkey: 14381221