APPLICATION OF DIETHYL ETHER EXTRACTION FROM SALT SOLUTIONS FOR SAMPLE PREPARATION FOR GAS CHROMATOGRAPHIC ANALYSIS OF COGNAC PRODUCTION
At 20,0 ± 0,1 °С in ideal region of concentrations of substances in organic phase the distribution of cognac production model components between saturated aqueous solutions of ammonium sulfate and organic solvents was studied in systems (NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub> - H<sub>2</sub>O - diethyl ether, (NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub> - H<sub>2</sub>O - 1-hexanol. Distribution constants and increments of methylene and functional groups of studied substances were calculated. The dependence of methylene, hydroxyl and carboxyl groups' increments of ethanol concentration in aqueous phase was studied. A procedure was developed for extraction sample preparation of cognac products for the revealing of adulterated products by gas chromatography - mass spectrometry. Analytical characteristics of the developed and already known procedures were compared in example with adulterated cognac «Insterburg» produced in Russia.