Simultaneous determination of zinc and nickel with 2-(2-pyridylmethyleneamino)phenol by first-derivative spectrophotometry

Abstract

A first-derivative spectrophotometric method using a zero-crossing technique of measurement is described for the simultaneous determination of zinc and nickel in mixtures. The procedure is based on the reaction of zinc and nickel with 2-(2-pyridylmethyleneamino)phenol in buffered 10% v/v methanol–water solutions at pH 8. The determination of nickel and zinc in mixtures in the concentration ranges 0.3–3.0 and 1.0–6.0 µg ml^–1, respectively, shows good linearity of the calibration graphs. The proposed method was applied to the determination of nickel and zinc in a real bronze sample. The main interferences present in copper alloy were also examined.