Liquid Liquid Extraction of Cpper(II) with 1-Naphthylbenzohydroxamic acid

Abstract

The extraction of copper(II) ion from aqueous solution of pH 5 was studied by using 1-naphthylbenzo hydroxamic acid (NBHA). Quantitative extraction was obtained after 25 min. The extract is colorless having maximum absorbance at 320 nm with molar absorptivity of 1.2 χ 103 L mol"1 cm'1. The amount of copper was determined in the raffinate by absorption spectrophotometry at 510 nm using PAR as chromogenic reagent. The molar absorptivity of the solution is 7 χ 104 L mol'1 cm . The selectivity of copper extraction was investigated in the presence of diverse ions and the results showed that iron(III) and citrate are the main interfering ions in the procedure. The thermodynamic functions associated with the extraction process are evaluated from the distribution measurements.