Journal of Analytical Chemistry

, Volume 62, Issue 12, pp 1136–1142 | Cite as

Optimization and use of composite coatings based on silicon oxide and polyvinylsulfonic acid for the adsorption-spectrophotometric determination of iron(II) and zinc(II) phenanthrolinates

  • O. Yu. Nadzhafova
  • M. V. Drozdova
  • E. V. Nebesnaya
  • V. B. Ishchenko


Conditions are optimized for preparing sol-gel modified composite films based on silicon oxide and polyvinylsulfonic acid in the presence of the Tween 20 nonionic surfactant as a template for the adsorption of Fe(II) and Zn(II) phenanthrolinates. The adsorption of Zn(II), Cu(II), Mn(II), Co(II), and Ni(II) phenanthrolinates followed by their development on the surface with Rose Bengal oxyxanthene dye was studied by spectrophotometry. The variation of the pH of the solution pH and the addition of 0.01 M of EDTA enhanced the selectivity of determining Zn(II) using a film obtained under optimum conditions. The applicability of the proposed thin-film coatings to the adsorption-spectrophotometric determination of Fe(II) and Zn(II) in the ranges of 0.2–5.6 and 0.3–5.0 mg/L, respectively, was shown. The procedure was used to determine zinc in vitamin preparations, a food supplement, and an insulin preparation. The accuracy of determination was checked by atomic absorption spectrometry. The detection limit for zinc was 0.06 mg/L at a liquid phase volume of 25 mL and absorption layer thickness of 0.015 ± 0.003 mm.


Phen Glass Plate Composite Coating Nonionic Surfactant Phenanthrolinate 
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Copyright information

© Pleiades Publishing, Ltd. 2007

Authors and Affiliations

  • O. Yu. Nadzhafova
    • 1
  • M. V. Drozdova
    • 1
  • E. V. Nebesnaya
    • 1
  • V. B. Ishchenko
    • 1
  1. 1.Shevchenko National UniversityKievUkraine

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