FIELD: chemistry.
SUBSTANCE: chromium (VI) ions are extracted from acidic aqueous solutions with the protonated form of N',N'-dipentylhydrazide 2-ethylhexanoic acid in form of its salt with sulphuric acid or hydrochloric acid in kerosene. Concentration of sulphuric acid is greater than 3.5 mol/l and concentration of hydrochloric acid is greater than 4 mol/l. A modifier - 0.04% solution of 2-ethylhexanol is used to prevent formation of a third phase.
EFFECT: more efficient extraction of chromium in strongly acidic media, simple process and wide range of extraction reagents.
5 tbl, 4 ex
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