Semimicrodetermination of Fluorine in Volatile Organic Compounds

Abstract

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

Determination of Fluorine in Organic Compounds. Microcombustion Method

“…of oxygen per minute (21). A high oxygen ratio is required (20). Solids are introduced in platinum boats and liquids in the usual capillaries made of heat-resistant glass.…”

Determination of Fluorine in Monofluorinated Organic Compounds in Air and Water

“…Hartley (IS) treated air mixtures with chromosulfuric acid and estimated hydrogen fluoride from the extent of etching of the glass container; his group also used a pyrolysis lamp to convert the fluorine to hydrogen fluoride. Schumb and Radimer (30) measured hydrogen fluoride formed in a platinum tube at 1100°C. Drake (9) estimated the concentration of fluoro-organic compound in air mixtures by noting the color change in a standardized test paper impregnated with thorium nitrate and Solochrome Brilliant Blue indicator when the test paper was exposed to the effluent gas mixture after it had contacted a hot platinum wire.…”