Volume 29, Issue 6, November 2000
Index of content:
A Reference Equation of State for the Thermodynamic Properties of Nitrogen for Temperatures from 63.151 to 1000 K and Pressures to 2200 MPa29(2000); http://dx.doi.org/10.1063/1.1349047View Description Hide Description
A new formulation for the thermodynamic properties of nitrogen has been developed. Many new data sets have become available, including high accuracy data from single and dual-sinker apparatuses which improve the accuracy of the representation of the surface of gaseous, liquid, and supercritical nitrogen, including the saturation states. New measurements of the speed of sound from spherical resonators yield accurate information on caloric properties in gaseous and supercritical nitrogen. Isochoric heat capacity and enthalpy data have also been published. Sophisticated procedures for the optimization of the mathematical structure of equations of state and special functional forms for an improved representation of data in the critical region were used. Constraints regarding the structure of the equation ensure reasonable results up to extreme conditions of temperature and pressure. For calibration applications, the new reference equation is supplemented by a simple but also accurate formulation, valid only for supercritical nitrogen between 250 and 350 K at pressures up to 30 MPa. The uncertainty in density of the new reference equation of state ranges from 0.02% at pressures less than 30 MPa up to 0.6% at very high pressures, except in the range from 270 to 350 K at pressures less than 12 MPa where the uncertainty in density is 0.01%. The equation is valid from the triple point temperature to temperatures of 1000 K and up to pressures of 2200 MPa. From 1000 to 1800 K, the equation was validated with data of limited accuracy. The extrapolation behavior beyond 1800 K is reasonable up to the limits of chemical stability of nitrogen, as indicated by comparison to experimental shock tube data.
29(2000); http://dx.doi.org/10.1063/1.1347983View Description Hide Description
Few data are available on the behavior of higher aliphatic hydrocarbons in the environment and especially in relation to hydrophobicity. Sorption to soil and bioconcentration by aquatic organisms are examples of processes that can be estimated from hydrophobicity parameters, such as aqueous solubility and octanol-water partition coefficient. A literature study was carried out on these physicochemical properties of aliphatic hydrocarbons containing ten or more carbon atoms. In general, very few experimental data were found, probably as a consequence of the fact that these parameters are very difficult to determine for these compounds. Reliable data on hydrophobicity parameters, for example, were not found for -alkanes higher than tridecane.
IUPAC-NIST Solubility Data Series. 72. Nitromethane with Water or Organic Solvents: Ternary and Quaternary Systems29(2000); http://dx.doi.org/10.1063/1.1342856View Description Hide Description
The mutual solubilities and liquid–liquid equilibria of nitromethane ternary and quaternary systems with liquidsolvents are reviewed. The solvents include water, inorganic compounds, and a variety of organic compounds such as hydrocarbons, halogenated hydrocarbons, alcohols, acids, esters, and nitrogen compounds. A total of 107 ternary and eight quaternary systems whose properties were described in the chemical literature through 1998 are compiled. For 22 systems, sufficient data were available to allow critical evaluation. All data are expressed as mass and mole fractions as well as the originally reported units. Similar reviews of gas, liquid, and solid solubilities for other systems have been published in the frame of Solubility Data Series. This is the 72 volume of this series.
Erratum: “IUPAC-NIST Solubility Data Series 66. Ammonium Phosphates” [J. Phys. Chem. Ref. Data 27, 1289 (1998)]29(2000); http://dx.doi.org/10.1063/1.1347985View Description Hide Description