While carrying out research on the extraction of oil from soybeans using mixtures of various solvents, it was quite often necessary to know the composition of a mixture of liquids containing three components. A search of the literature for ways of obtaining the composition of such mixtures by the use of physical constants revealed a very convenient method employing a combination of density and refractive index. Before this method can be used, however, solutions covering the entire ternary system must be made up accurately, their refractive indices and densities taken and plotted in such a manner that the composition of solutions of constant refractive index and solutions of constant specific gravity can be determined. Finally a triangular diagram must be constructed showing the lines of constant refractive index and constant specific gravity as related to the composition (1, 2).
Proceedings of the Iowa Academy of Science
©1940 Iowa Academy of Science, Inc.
Measamer, S. G. and Sweeney, O. R.
"Estimation of the Composition of Three Component Liquid Mixtures,"
Proceedings of the Iowa Academy of Science, 47(1), 207-211.
Available at: https://scholarworks.uni.edu/pias/vol47/iss1/40