Abstract
Extraction of Cu(II), Co(II), Ni(II), and Zn(II) with N-(para-tert-butylbenzoyl)-N′,N′-dialkylhydrazines was studied. In contrast to other listed elements, copper(II) is extracted with these reagents in a wide pH range and NH3 concentrations, which provides its selective separation. Effect of chain length of the N′,N′-alkyl groups and solvent nature on copper extraction and its stripping conditions were determined. Extraction constants were calculated. Ammonium salts decrease the extraction degree of copper(II). The studied reagents are superior to the known industrial reagent of β-diketone class, LIX 54, in terms of copper(II) extraction efficiency from ammonia media.
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