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Abstract
1. The extraction of Cr(III) with solutions of 8-hydroxyquinoline in organic solvents practically cannot be accomplished even at increased temperature as a result of the “inertness” of aquo-complexes of chromium and on account of the formation of incompletely substituted or hydrated hydroxyquinolinates. 2. The rate of extraction and the amount of chromium extracted increases sharply in the presence of salts of formic or acetic acid when the temperature is raised to 50–80°. The significance of the presence of these salts in the aqueous phase is determined by the formation of more labile complexes of Cr(III). 3. Oxygen-containing organic solvents (alcohols) extract chromium more rapidly and completely than “inert” solvents (of the type of chloroform and benzene) for two reasons: in the first place, on account of the lower distribution constant of the reagent in the system water-organic solvent, and in the second place, on account of the possibility of the formation of solvents of the chromium hydroxyquinolate to be extracted.
Published Version
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Schedule a callMore From: Bulletin of the Academy of Sciences of the USSR Division of Chemical Science
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