Separation of Zirconium and Hafnium with Thenoyltrifluoroacetone 3179 can be added to their discussion except to say that a completely satisfying theory of the behavior of such solutions is not yet possible, and to emphasize again the fact that interactions between the unlike molecules are involved, in addition to the type of association of the alcohol postulated by Redlich and Kister.10 Summary For the system ethanol-methylcyclohexane, densities and refractive indices have been measured at 25°. Total and partial vapor pressures have been determined at 35 and 55°. Thermodynamic con-sistency of the data was found to be satisfactory.Vapor compositions are represented by the empirical equation previously developed by the authors, to within 0.005 mole fraction. They can be represented by an equation developed by Redlich and Kister, with somewhat less accuracy, and with rather anomalous values of the equilibrium constant involved.The excess free energy, entropy and enthalpy have been calculated from the data, and exhibit a similar behavior to that of other alcohol-hydrocarbon systems.Peoria 5, Illinois
The use of radioisotopes as a basis for radiophysical instrumental methods of analysis can be exemplified by the following: Iron-55 emits a K-capture electron from the nucleus whose radiation can be absorbed by a sulfur atom regardless of its chemical combination. A practical procedure is described for the measurement of sulfur in all forms (SO2, SO3, S2O3, RSH, R2S, RSSR, etc.) by using an uncalibrated source of iron-55, a sample holder, a suitable absorption cell, and an appropriate detecting instrument. The method for analytical determination of sulfur in hydrocarbons is very fast compared to the standard lamp or bomb used in present ASTM methods. The equipment has been built and operated. A method has been prepared for proposal.
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