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.