Determination of Microamount of Zinc in Some Metals by Atomic Absorption Spectrometry

A rapid method for the determination of zinc in copper, lead and aluminium alloys by atomic absorption spectrometry was established, whereby a quite linear analytical curve was obtained for 0～10μg Zn/ml in 0.5N hydrochloric acid or nitric acid solution in the presence of alloying elements. When oxine- or dithizone-methyl isobutyl ketone, and dithizone-chloroform extraction are applied to the analysis for microamount of zinc, the sensitivity of the method is tenfold multiplied ; and 0.0001～0.003% zinc in high purity lead metal, aluminium metal and electrolytic iron can be determined. The conditions recommended are as follows : wavelength 2138A ; hollow cathode lamp current 27.5mA ; slit width 0.3mm ; pressure of air 1.5kg/cm^2 ; pressure of acetylene 0.5kg/cm^2 for aqueous solution and 0.3kg/cm^2 for methyl isobutyl ketone solution with water-cooled burner