Simultaneous determination of nickel, zinc and copper by second-derivative spectrophotometry using 1-(2-pyridylazo)-2-naphthol as reagent

Abstract

A derivative spectrophotometric method, based on the use of second-derivative absorption spectra, has been developed for the simultaneous determination of microgram amounts of nickel, zinc and copper in an aqueous ethanolic medium. The peak to base line measurement technique has been used with good results. Using the proposed method, nickel (0.3–2.0 p.p.m.), zinc (0.5–3.0 p.p.m.) and copper (0.5–3.0 p.p.m.) in various ratios have been determined with good precision and accuracy.