Magnitudes of the hydrogen isotope effects are in the order CaCl MgCl > MgSO > KCl NaCl > NaSO at the same molality. That is, D/H ratio of water vapor more » in isotope equilibrium with a solution increases as salt is added to the solution. Hydrogen isotope activity ratios of all of the salt solutions studied were appreciably higher than composition ratios. A parallel equilibration technique of pure water and salt solutions with the same isotopic composition at the same experimental conditions enabled the precise determination of the isotope salt effects. The differences between oxygen and hydrogen isotope activity and composition ratios of water in single salt solutions (NaCl, KCl, MgCl, CaCl, NaSO, and MgSO) were determined by means of a vapor-liquid water equilibration method over the temperature range of 50 to 100C. In addition to the parameters determined from the binary end-member solutions, it was found that only was needed to represent the ternary results. The authors have evaluated the data within the framework of the Pitzer formalism and obtain new values for the ion interaction and mixing parameters for this ternary system. On the basis of the results of this study, most of the previously reported 308.15 K density data in the ternary system appear to contain large errors. Most significantly, the results reported here substantially expand the volumetric data base for ternary solutions. Very large discrepancies between the results of the three most recent reports of densities for the CaCl-HO system at 308.15 K are resolved here, improving both the accuracy and precision for this system. The present results are in excellent agreement with previously published data for the NaCl-HO binary and are in very good agreement with the more » more precise of the available data for the CaCl-HO binary at 298.15 K. Densities for ternary solutions in the system NaCl-CaCl-HO were measured with a vibrating-tube densimeter at 298.15 0.09 and 308.15 0.03 K and 0.1 MPa and over a range of ionic strengths from 0.1 to 19.2 molkg1]. « lessĭata on the physical properties of the ternary system NaCl-CaCl-HO are of particular importance in the processing and disposal of brines produced from industrial processes, chemical manufacture, and petroleum and geothermal reservoirs. The cause for the large difference between anti C/sub p//sup 0//sub 2/ and anti C/sub V//sup 0//sub 2/ is the large electrostrictive effect of the ions on the volume of the solution at these temperatures.
The Born equation agrees with these results. The experimental results for anti C/sub V//sup 0//sub 2/ up to 573 K show a small temperature dependence in contrast to the large temperature dependence of anti C/sub p//sup 0//sub 2/. Large electrostatic effects are observed near the critical temperature and pressure. The Born equation gives reasonably accurate results with a single, adjustable radius for both volumetric and heat capacity effects, provided electrostatic effects are large compared to chemical effects. The values of anti V/sup 0//sub 2/, anti C/sub P//sup 0//sub 2/, and anti C/sub V//sup 0//sub 2/ have been compared with calculations using the Born equation for more » 1 mol of hard-sphere ions of radius 0.327 nm. deltaT)/sub p/ (change in molal volume with respect to temperature at constant pressure) and anti C/sub p//sup 0//sub 2/ (partial molal heat capacity at constant pressure) are used to calculate anti C/sub V//sup 0//sub 2/ (partial model heat capacity at constant volume) for aqueous NaCl at infinite dilution and 17.7 MPa over the temperature range 300 to 573K. chemical congress of the North American Continent, Las Vegas, NV, USA, Country of Publication: United States Language: English Subject: 15 GEOTHERMAL ENERGY CALCIUM CHLORIDES VISCOSITY POTASSIUM CHLORIDES SODIUM CHLORIDES AQUEOUS SOLUTIONS EVALUATED DATA EXPERIMENTAL DATA HIGH PRESSURE HIGH TEMPERATURE MEDIUM TEMPERATURE MIXTURES TABLES ALKALI METAL COMPOUNDS ALKALINE EARTH METAL COMPOUNDS CALCIUM COMPOUNDS CALCIUM HALIDES CHLORIDES CHLORINE COMPOUNDS DATA DISPERSIONS HALIDES HALOGEN COMPOUNDS INFORMATION NUMERICAL DATA POTASSIUM COMPOUNDS SODIUM COMPOUNDS SOLUTIONS Geothermal Legacy 152001* - Geothermal Data & Theory- Properties of Aqueous = ,Įxperimental values of anti V (molal volume)/sup 0//sub 2/, (par. OSTI Identifier: 6731414 Report Number(s): LBL-11586 CONF-800814-30 DOE Contract Number: W-7405-ENG-48 Resource Type: Conference Resource Relation: Conference: 180. Authors: Phillips, S L Ozbek, H Igbene, A Litton, G Publication Date: Research Org.: California Univ., Berkeley (USA).
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