Showing papers in "Journal of Physical and Chemical Reference Data in 1981"
TL;DR: In this article, the International Association for the Properties of Steam (IAPS) issued a new international formulation for the ion product of water substance (May 1980), which is represented by an equation, based on density and two quadratic functions of reciprocal absolute temperature, for use from 0 to 1000°C and 1 to 10,000 bars pressure.
Abstract: This paper is the background for a new international formulation for the ion product of water substance (May 1980) issued by the International Association for the Properties of Steam. The ion product of water (Kw) is represented by an equation, based on density and two quadratic functions of reciprocal absolute temperature, for use from 0 to 1000 °C and 1 to 10,000 bars pressure. The equation is believed to describe within ±0.01 units of log Kw* (where Kw* equals Kw/(mol kg−1)2) many of the measurements at saturated vapor pressure up to 200 °C, and to within ±0.02 units up to the critical temperature (374 °C). It also describes within the experimental uncertainty the several sets of measurements at high pressures and should provide values within ±0.05 and 0.30 units at low and high temperatures, respectively.
968 citations
TL;DR: In this paper, the relationship between vapor pressure, solubility and Henry's law constant for solid and liquid compounds is presented and experimental techniques for obtaining these quantities with the required accuracy are discussed.
Abstract: The Henry’s law constants (air‐water partition coefficients) of hydrophobic organic compounds of environmental concern are reviewed. An outline of the thermodynamic principles which govern the relationships between vapor pressure, solubility and Henry’s law constant for solid and liquid compounds is presented and experimental techniques for obtaining these quantities with the required accuracy are discussed. Vapor pressure, solubility, and Henry’s law constant data are tabulated and reviewed for a total of 150 compounds in 12 tables consisting of gaseous, liquid and solid alkanes, cycloalkanes, alkenes, alkynes, monoaromatics, polynuclear aromatics, halogenated alkanes, alkenes and aromatics, and selected pesticides.
740 citations
TL;DR: The available rate data on the reactivity and physical deactivation of molecular oxygen in its first electronic excited state (1Δg) in liquid solution have been critically compiled as discussed by the authors.
Abstract: The available rate data on the reactivity and physical deactivation of molecular oxygen in its first electronic excited state (1Δg) in liquid solution have been critically compiled. Where possible, relative rates reported in the literature have been normalized to standard values selected by a statistical analysis of the experimental data. Second order rate constants for the deactivation and chemical reaction of singlet oxygen are reported for 670 compounds. Additionally, psuedo first order rate constants (kd) for solvent deactivation of singlet oxygen are reported for 50 different solvents.
555 citations
TL;DR: In this article, the dynamic and kinematic viscosity of aqueous sodium chloride solutions are given. But the accuracy of the tabulated values is only ± 0.5%.
Abstract: Tabulated values of the dynamic and kinematic viscosity of aqueous sodium chloride solutions are given. The tables cover the temperature range 20–150 °C, the pressure range 0.1–35 MPa and is the concentration range 0–6 molal. It is estimated that the accuracy of the tabulated values is ±0.5%. The correlating equations from which the tables were generated are given.
454 citations
TL;DR: In this article, a set of recommended data for amorphous polystyrene is derived and the effect of tacticity on the heat capacity is also evaluated, and entropy and enthalpy functions are calculated.
Abstract: The heat capacity of polystyrene from 0 K to 600 K is reviewed on the basis of measurements on 29 samples reported in the literature. A set of recommended data for amorphous polystyrene is derived. The effect of tacticity on the heat capacity is also evaluated. Entropy and enthalpy functions are calculated. This paper is the fifth in a series of publications which will ultimately cover all heat capacity measurements on linear macromolecules.
238 citations
TL;DR: A critical evaluation of the mean acivity and osmotic coefficients in aqueous solutions of thirty-five uni-bivalent electrolytes at 298.15 K is presented in this article.
Abstract: A critical evaluation of the mean acivity and osmotic coefficients in aqueous solutions of thirty‐five uni‐bivalent electrolytes at 298.15 K is presented. The systems which have been treated are ammonium orthophosphate, guanadinium carbonate, 1,2‐ethane disulfonic acid, m‐benzene disulfonic acid, ammonium decahydroborate, and the unibivalent compounds of lithium, sodium, potasium, rubidium, and cesium. Osmotic coefficients were calculated from direct vapor pressure measurements, from isopiestic measurements and from freezing‐point depression measurements. Activity coefficients were calculated from electromotive force measurements on galvanic cells without transference and from diffusion measurements. Given are empirical coefficients for three different correlating equations, obtained by a weighted least squares fit to the experimental data, and tables consisting of the activity coefficients of the compounds, the osmotic coefficients and activity of water, and the excess Gibbs energy of the solution as fun...
195 citations
TL;DR: A critical evaluation of the mean activity and osmotic coefficients in aqueous solutions of eleven bi-univalent compounds of zinc and cadmium and ethylene bis(trimethylammonium) chloride and iodide at 298.15 K is presented in this article.
Abstract: A critical evaluation of the mean activity and osmotic coefficients in aqueous solutions of eleven bi‐univalent compounds of zinc and cadmium and ethylene bis(trimethylammonium) chloride and iodide at 298.15 K is presented. Osmotic coefficients were calculated from direct vapor pressure measurements, from isopiestic measurements and from freezing point depression measurements. Activity coefficients were calculated from electromotive force measurements on galvanic cells with and without transference. Given are empirical coefficients for three different correlating equations, obtained by a weighted least squares fit of the experimental data, and tables consisting of the activity coefficients of the compounds, the osmotic coefficients and activity of water, and the excess Gibbs energy of the solution as functions of the molality for each electrolyte system. The literature coverage is through the computerized version of Chemical Abstracts of September 1979.
180 citations
TL;DR: In this article, the transition probabilities for about 5100 spectral lines of the elements iron, cobalt, and nickel in all stages of ionization have been evaluated and compiled, along with the spectroscopic designation, the wavelength, the statistical weights, and the energy levels of upper and lower atomic states.
Abstract: Atomic transition probabilities for about 5100 spectral lines of the elements iron, cobalt, and nickel in all stages of ionization have been critically evaluated and compiled. All available literature sources have been considered. Systematic trends along isoelectronic sequences have been exploited to predict oscillator strengths (f‐values) whenever no data were available in the literature. The data are presented in separate tables for each element and stage of ionization and are arranged according to multiplets and, where appropriate, also according to transition arrays and increasing quantum numbers. For each line the transition probability for spontaneous emission, the absorption oscillator strength, and the line strength are given, along with the spectroscopic designation, the wavelength, the statistical weights, and the energy levels (when available) of the upper and lower atomic states. In addition, the estimated accuracy and the literature reference are indicated. In short introductions which preced...
153 citations
TL;DR: In this paper, the energy level data for the atom and all positive ions of sodium (Z = 11) were compiled from published material on measurements and analyses of the optical spectra.
Abstract: Energy level data are given for the atom and all positive ions of sodium (Z = 11). These data have been critically compiled, mainly from published material on measurements and analyses of the optical spectra. We have derived or recalculated the levels for a number of the ions. In addition to the level value in cm−1 and the parity, the J value and the configuration and term assignments are listed if known. Leading percentages from the calculated eigenvectors are tabulated wherever available. Ionization energies are given for all spectra.
120 citations
TL;DR: In this article, the energy levels of the nickel atom in all of its stages of ionization, as derived from the analyses of atomic spectra, have been critically compiled, in cases where only line classifications are reported in the literature, level values have been derived.
Abstract: The energy levels of the nickel atom in all of its stages of ionization, as derived from the analyses of atomic spectra, have been critically compiled. In cases where only line classifications are reported in the literature, level values have been derived. Electron configurations, term designations, J‐values, experimental g‐values, and ionization energies are included.
95 citations
TL;DR: In this paper, the heat capacity of selenium from 0 K to 1000 K was reviewed using measurements on 20 samples reported in the literature, and a set of recommended data for trigonal, monoclinic, glassy, and molten seenium was derived.
Abstract: The heat capacity of selenium from 0 K to 1000 K is reviewed using measurements on 20 samples reported in the literature. A set of recommended data for trigonal, monoclinic, glassy, and molten selenium is derived. Ring‐chain equilibrium parameters are critically evaluated. Entropy, enthalpy, and Gibbs energy functions are calculated. Selenium is a model compound for a monoatomic, linear macromolecule. This paper is first in a series which will ultimately cover all heat capacity measurements on linear macromolecules.
TL;DR: A critical evaluation of the mean activity coefficient, γ±, and osmotic coefficient, φ, of aqueous sulfuric acid at 298.15 K is presented for the molality range of 0 to 28 mol⋅kg−1 as discussed by the authors.
Abstract: A critical evaluation of the mean activity coefficient, γ±, and osmotic coefficient, φ, of aqueous sulfuric acid at 298.15 K is presented for the molality range of 0 to 28 mol⋅kg−1. Osmotic coefficients were calculated from direct vapor pressure measurements, from isopietic measurements or from freezing point depression measurements. Activity coefficients were calculated from electromotive force measurements of galvanic cells. A least‐squares program was used to fit data from all sources using both φ and ln γ± as functions of molality. A nine parameter equation describes the osmotic coefficient, the mean activity coefficient, and the excess. Gibbs energy as a function of the one‐half power of molality. The scientific literature has been covered through January, 1979.
TL;DR: The standard thermodynamic properties of phases in the lime-alumina-silica water system between 273.15 and 1800 K at 101.325 kPa (1 atm) were evaluated from published experimental data as mentioned in this paper.
Abstract: The standard thermodynamic properties of phases in the lime‐alumina‐silica‐ water system between 273.15 and 1800 K at 101.325 kPa (1 atm) were evalated from published experimental data. Phases included in the compilation are boehmite, diaspore, gibbsite, kaolinite, dickite, halloysite, andalusite, kyanite, sillimanite, Ca‐Al cliniopyroxene, anorthite, gehlenite, grossular, prehnite, zoisite, margarite, wollastonite, cyclowollastonite ( = pseudowollastonite), larnite, Ca olivine, hatrurite, and rankinite. The properties include heat capacity, entropy, relative enthalpy, and the Gibbs energy function of the phases and the enthalpies, Gibbs energies, and equilibrium constants for formation both from the elements and the oxides. Tabulated values are given at 50 K intervals with the 2‐sigma confidence limit at 250 K intervals. Summaries for each phase give the temperature‐ dependent functions for heat capacity, entropy, and relative enthalpy and the experimental data used in the final evaluation.
TL;DR: The energy levels of the cobalt atom in all of its stages of ionization, derived from analyses of atomic spectra, have been critically compiled as mentioned in this paper, in cases where only line classifications are reported in the literature, level values have derived.
Abstract: The energy levels of the cobalt atom in all of its stages of ionization, derived from analyses of atomic spectra, have been critically compiled. In cases where only line classifications are reported in the literature, level values have derived. Electron configurations, term designations, J‐values, experimental g‐values, leading percentages and ionization energies are included.
TL;DR: In this article, the line positions of the bands have been calculated from the constants of the fits to provide accurate absorption line positions to serve as wavelength standards in the regions of 522 cm−1 to 657 cm− 1 and from 1115 cm −1 to 1340 cm−2 in the infrared.
Abstract: Data from the literature has been critically selected and refitted by least squares to provide accurate vibrational band centers and rotational constants for three bands of N2O. The line positions of the bands have been calculated from the constants of the fits to provide accurate absorption line positions to serve as wavelength standards in the regions of 522 cm−1 to 657 cm−1 and from 1115 cm−1 to 1340 cm−1 in the infrared.
TL;DR: In this paper, a critical evaluation of the mean activity and osmotic coefficients of aqueous alkali metal nitrites at 298.15 K is presented for the molality range from dilute to saturation.
Abstract: A critical evaluation of the mean activity γ±, and osmotic coefficients, φ, of aqueous alkali metal nitrites at 298.15 K is presented for the molality range from dilute to saturation. Osmotic coefficients were calculated from static vapor pressure measurements. A nonlinear least‐squares program was used to fit φ data as a function of molality. Several equations describe the osmotic coefficient, the mean activity coefficient, and the excess Gibbs energy as a function of the square‐root of molality for each slit. The scientific literature was covered through March 1979.
TL;DR: In this paper, the available data on methane are critically reviewed for information applicable to radio astronomy, including rotational constants, centrifugal distortion constants, and the distortion electric dipole moment.
Abstract: The available data on methane are critically reviewed for information applicable to radio astronomy. Molecular data such as rotational constants, centrifugal distortion constants, and the distortion electric dipole moment are presented for 12CH4 and 13CH4. Observed microwave, infrared‐microwave double resonance, and molecular beam measurements of (ΔJ = 0) frequencies are tabulated along with experimental uncertainties which represent estimated 95% confidence limits. For 12CH4, these data have been analyzed to predict all Q‐branch rotational transitions for J?20; the predictions are presented with 95% confidence limits which have been calculated from the analysis.