A simple, rapid semimicromethod for determination of fluorine in volatile organic compounds has been developed. There is no interference from hydrogen in the sample, which is passed at a constant rate with moist oxygen through a platinum tube at 1100 °C. The resultant hydrogen fluoride is absorbed in water in an absorber constructed of saran tubing, the chlorine and carbon dioxide being largely carried off. To the hydrofluoric acid solution phenolphthalein is added, and the solution is neutralized and added to a solution of titanium sulfate, sulfuric THE identification of fluorocarbons may be accomplished by either physical or chemical means.Many physical methods depend upon the separation of the pure compound, or an azeotrope of it, with a Podbielniak column (8, 6,21), followed by a determination of the melting point, boiling point, refractive index, or liquid density. Gas density and melting point lowering may