详细
A method for the determination of acetone acylhydrazones has been developed based on the formation of a colored complex with copper(II) ions in ammonia solutions of the composition Cu : reagent = 1 :2, its subsequent extraction with chloroform and measurement of the light absorption of extracts at 553 nm (ε = 128 l/(mol·cm)); the linear range of determined concentrations is 80.0–590.0 mg/l; relative error <2.80%). Using the example of heptanoyl hydrazone acetone, it is shown that the reagent in the composition of the complex compound is quantitatively extracted in the pH range of 7–10 with a single extraction for 3 minutes; a two-fold excess of copper(II) is sufficient for its complete extraction. The spectra of homologue complexes of the studied series of acetone acylhydrazones are similar. The spectrophotometric method has established high hydrolytic stability of reagents in a narrow range of pH values 9–10. The technique has been tested on solutions obtained by studying the adsorption of reagents on chalcopyrite. The correctness of the analysis results was verified by the additive method.