Liquid -liquid extraction of copper (II), cadmium (II) and lead (II) using tripodal N-donor pyrazole ligands

Abstract

Two different series of N-donor pyrazole ligands have been used in the liquid-liquid extraction of Cu(II), Cd(II) and Pb(II) ions from aqueous solution using methylene chloride as a solvent. The percentage of extracted metal ion determined by atomic absorption measurements has been analyzed as a function of the ligand structure. It is shown that the ligand capacity to extraction is affected by the nature of the bridge between the central nitrogen atom and the pyrazole rings. The tridentate ligand exhibits a good extractive affinity for copper (II) and lead (II).