Abstract
From 30 to 50 mg of a sample was taken in a Kjeldahl flask (20 ml capacity) of Pyrex glass. Fuming sulfuric acid and fuming nitric acid were added, and the flask was heated until the sample turned to white silica. It was then dissolved in NaOH and made to 2 N acid by adding HCl. The absorbancy was measured at 420 mμ after adding the coloring reagent, a mixture of H2TiF6 and H2O2. Satisfactory results comparable to those by gravimetry were obtained with respect to six samples of silicone.
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