A method for the routine determination of boric oxide in glass, based on the "partition" of boric acid between water and ether in the presence of hydrochloric acid and ethanol, has been developed.A slightly acid solution of the fusion of the glalis is shaken with ether and ethanol, and the boric acid in the ether layer titrated.The partition coefficient is 0.403 at 25 ± 2° C. The advantages of this method are its speed and simplicity without material sacrifice of accuracy.Boric oxide between 0.7 and 16 percent can be rapidly and accurately determined.Lime, magnesia, alumina, soda, iron, and arsenic, in amounts likely to be found in glass, do not interfere.Barium, fluorine, and abnormally large amounts of iron interfere slightly.Zinc interferes seriously.
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Glaze et al. (1936) studied this question.