Simultaneous spectrophotometric determination of Zinc(II) and Nickel(II) with 1-(2-pyridylazo)-2-naphthol

M. Blanco, J. Coello, H. Iturriaga, S. Maspoch, E. Bertran

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A new procedure for the simultaneous spectrophotometric determination of Zn(II) and Ni(II) with 1-(2-pyridylazo)-2-naphthol as chromogenic reagent has been developed. It is based on resolution of the mixed spectrum over the wavelength range 530-590 nm by applying a least-squares fitting program to standard spectra from each component. The spectra are recorded at an apparent pH of 5.0, provided by an acetate buffer in a mixed 60:40 v/v 2-ethoxyethanol/water medium. The relative standard deviations for determination of 13.7 μg of Ni and 31.0 μg of Zn were 1.9 and 1.0%, respectively (8 replications). The method has been applied to the analysis of iron surfaces coated with a Zn-Ni alloy. The results are compared with those obtained by atomic-absorption spectrophotometry. © 1992 Springer-Verlag.
Original languageEnglish
Pages (from-to)53-59
JournalMikrochimica Acta
Issue number1-2
Publication statusPublished - 1 Jan 1992


  • multicomponent analysis
  • multiwavelength spectrophotometry
  • UV-Vis spectrophotometry
  • Zn-Ni determination


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