caa a22 4500 463219295 CHVBK 20180405153207.0 cr unu---uuuuu 170326e20071201xx s 000 0 eng 10.1134/S1061934807120064 doi (NATIONALLICENCE)springer-10.1134/S1061934807120064 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 [Elektronische Daten] [O. Nadzhafova, M. Drozdova, E. Nebesnaya, V. 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. Pleiades Publishing, Ltd., 2007 Nadzhafova O. Shevchenko National University, Kiev, ul. Vladimirskaya 64, 01033, Kiev, Ukraine aut Drozdova M. Shevchenko National University, Kiev, ul. Vladimirskaya 64, 01033, Kiev, Ukraine aut Nebesnaya E. Shevchenko National University, Kiev, ul. Vladimirskaya 64, 01033, Kiev, Ukraine aut Ishchenko V. Shevchenko National University, Kiev, ul. Vladimirskaya 64, 01033, Kiev, Ukraine aut Journal of Analytical Chemistry Nauka/Interperiodica 62/12(2007-12-01), 1136-1142 1061-9348 62:12<1136 2007 62 10809 https://doi.org/10.1134/S1061934807120064 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S1061934807120064 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Nadzhafova O. Shevchenko National University, Kiev, ul. Vladimirskaya 64, 01033, Kiev, Ukraine aut NATIONALLICENCE 700 1- Drozdova M. Shevchenko National University, Kiev, ul. Vladimirskaya 64, 01033, Kiev, Ukraine aut NATIONALLICENCE 700 1- Nebesnaya E. Shevchenko National University, Kiev, ul. Vladimirskaya 64, 01033, Kiev, Ukraine aut NATIONALLICENCE 700 1- Ishchenko V. Shevchenko National University, Kiev, ul. Vladimirskaya 64, 01033, Kiev, Ukraine aut NATIONALLICENCE 773 0- Journal of Analytical Chemistry Nauka/Interperiodica 62/12(2007-12-01), 1136-1142 1061-9348 62:12<1136 2007 62 10809 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer