Electroanalytical Applications of Some Mixed Complex Combinations with Schiff Base

Abstract

Four electrodes with liquid membrane, Cu²⁺-selective and Ni²⁺-selective were prepared and characterized. Electrodes 1 and 2 are based on mixed complexes of Cu(II) and Ni(II) with N-[2-thyenilmethylidene]-2-aminopyridine as ligand and electrodes 3 and 4 are based on the mixed complexes with N,N’-[2,2’-bis-thyenilmethylidene]tolylene. Cu²⁺-selective and Ni²⁺-selective electrodes have been used to determine the copper and nickel ions in aqueous solutions, by both direct potentiometric and potentiometric titration with EDTA. They have also been used for determining the Cu²⁺ and Ni²⁺ ions in industrial waters by direct potentiometry. The analytical results obtained have been checked by the standard addition method and by comparison with determinations through atomic absorption spectrometry.