Analytical Sciences

Zero- and First-Order Derivative Spectrophotometry for Individual and Simultaneous Determinations of Copper(II) and Palladium(II) Using an Oxazolidine Derivative as a New Reagent

Abdel-Aziz Y. El-SAYED * , Mohammed A. Abdel RAHEM and Ahmed A. OMRAN

Department of Chemistry, Faculty of Science, Al-Azhar University, Assiut, Egypt

A new oxazolidine derivative was synthesized as a reagent for individual and simultaneous determinations of Cu(II) and Pd(II) using zero- and first-order derivative spectrophotometry. 5-Imino-3-(p-methoxyphenyl)-2-methyloxazolidin-4-thione (PMOX) formed colored complexes with these metal ions in aqueous and micellar media containing cetylpyridi-nium bromide. The first-derivative spectra of these complexes permitted a simultaneous determination of Cu(II) and Pd(II) in concentration intervals 0.27 - 2.35 and 0.43 - 4.26 mg ml -1 at zero-crossing wavelengths of 412 and 376 nm, re-spectively. The influence of the experimental conditions, the ionization constant of the reagent and the stoichiometry of the complexes are reported. The methods were free from any interference of a large number of other metal ions. A critical evaluation of the proposed methods was performed by a statistical analysis of the experimental data. The methods have been applied to determine copper in steel, aluminum-, and nickel-base alloys and to the determination of palladium in activated charcoal. (Keywords: Simultaneous determination, copper determination, palladium determination, base-alloy, steels, derivative spectrophotometry, oxazolidine derivative)

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