Liquid-liquid extraction and spectrophotometric determination of zinc

Abstract

A liquid-liquid extraction and spectrophotometric method is described for the determination of trace amounts of zinc. Zinc is extracted at pH 8.0 with N-phenylcinnamohydroxamic acid and with stearylamine and determined spectrophotometrically after the addition of 1-(2-pyridylazo)-2-naphthol. Beer's law is obeyed over the range 0.05–1.92 p.p.m. at 550 nm and 0.04–1.90 p.p.m. at 550 nm with molar absorptivities of 5 × 10⁴ and 5.8 × 10⁴ l mol^–1 cm^–1, respectively. The effects of diverse ions are discussed. The method was applied to the determination of zinc in high-purity alloy samples.