Volume 24, Issue 4, July 1995
Index of content:
Summary of the Apparent Standard Partial Molal Gibbs Free Energies of Formation of Aqueous Species, Minerals, and Gases at Pressures 1 to 5000 Bars and Temperatures 25 to 1000 °C24(1995); http://dx.doi.org/10.1063/1.555976View Description Hide Description
Accurate values of the apparent standard partial molal Gibbs free energies of formation (ΔḠ°) of aqueous species, minerals, and gases at high temperatures and pressures are a requisite for characterizing a variety of industrial and natural processes including corrosion of metals, solvent extraction, crystal growth, metamorphism, and the formation of hydrothermal ore deposits. Revision of the HKF equations of state for aqueous species other than H2O (Helgeson, Kirkham and Flowers, 1981) by Tanger and Helgeson (1988) and Shock et al. (1992) permits calculation of ΔḠ° for these species at temperatures to 1000 °C and pressures to 5000 bars. The revised equations of state were combined with parameters generated by Shock and Helgeson (1988, 1990), Shock and McKinnon (1993), Shock and Koretsky (1993), Schulte and Shock (1993), Pokrovskii and Helgeson (1995 a, b, and c), and Sverjensky et al. (1995) together with densities and electrostatic properties of H2O computed from equations summarized by Johnson and Norton (1991) to calculate values of ΔḠ° for aqueous species as a function of temperature and pressure. The results of these calculations are tabulated for 348 such species, including both inorganic and organic aqueous ions, neutral species, and metal ligand complexes. Similar calculations using equations, parameters, and thermodynamic data taken from Kelley (1960), Helgeson <etal (1978), Wagman >et al. (1982), Hill (1990), Shock (1993), and Pokrovskii and Helgeson (1995 a and b) were used to generate tables of ΔḠ° for H2O, 22 minerals, and 18 gases. The tabulated values of ΔḠ°, which were generated with the aid of SUPCRT92 (Johnson et al., 1992), facilitate considerably assessment of the thermodynamic behavior of chemical processes at both high and low temperatures and pressures.
24(1995); http://dx.doi.org/10.1063/1.555967View Description Hide Description
The biennial review of atomic weight, A r (E), determinations and other cognate data has resulted in changes for the standard atomic weight of titanium from 47.88±0.03 to 47.867±0.001, of iron from 55.847±0.003 to 55.845±0.002, of antimony from 121.757±0.003 to 121.760±0.001, and of iridium from 192.22±0.03 to 192.217±0.003. Recent investigations on chlorine and bromine confirmed the presently accepted values of A r (Cl) and A r (Br). To emphasize the fact that the atomic weight of lithium commonly available in laboratory reagents can vary significantly, the value of lithium, A r (Li), was enclosed in brackets and a footnote was added. As a result of several changes, the Table of Standard Atomic Weights Abridged to Five Significant Figures has been updated. Because relative isotope‐ratio data for stable hydrogen, carbon, and oxygen are commonly being expressed on non‐corresponding scales, the Commission recommends that such isotopic data be expressed only relative to the references VSMOW and VPDB. Because many elements have a different isotopic composition in some non‐terrestrial materials, recent data on non‐terrestrial materials are included in this report for the information of the interested scientific community.
24(1995); http://dx.doi.org/10.1063/1.555968View Description Hide Description
Wavelengths, energy levels, ionization energies, line classifications, intensities and transition probabilities for Kr V through Kr XXXVI, ;with the exception of Kr XI through Kr XVII, are tabulated. No data have been published for Kr XI through Kr XVII. These data are based on the energy levels compilation of Sugar and Musgrove . Transition probabilities for selected M1 lines have been reported and are quoted here. A short review of the line identifications and wavelength measurements is given for each stage of ionization. The literature has been surveyed through February 1995.
Erratum: Evaluated Kinetic Data for Combustion Modeling. Supplement I [J. Phys. Chem. Ref. Data 23, 847 (1994)]24(1995); http://dx.doi.org/10.1063/1.555975View Description Hide Description