Color reactions of vanadium(V) with 8-hydroxyquinoline-5-sulfonic acid and ascorbic acid on PANV–AV-17 disks
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The adsorption of vanadium(V) and 8-hydroxyquinoline-5-sulfonic acid (HQS) on polyacrylonitrile fiber disks filled with an AV-17 (PANV–AV-17) anion exchanger is studied by diffuse reflection spectroscopy. Vanadium(V) at pH 5‒7 is adsorbed on PANV–AV-17; when a HQS solution is applied to the disk, a yellowish green complex compound formed, which changed color to almost black after the treatment of the disk with a HCl solution. The presence of sulfo groups in the HQS molecule ensures the preconcentration of the reagent on PANV–AV-17 disks with the registration of an analytical signal after the treatment of the disk with NaVO3 and 0.1 M HCl solutions. A linear dependence of the analytical signal is observed in the HQS concentration range of 1‒10 μg/mL. The presence of 20-fold amounts (by weight) of 8-hydroxyquinoline (HOQ) does not interfere with the determination. When ascorbic acid is applied to the disk with a vanadium(V)‒HQS‒HCl complex, the color changes from black to green. A test method for the determination of ascorbic acid is proposed. 8-Hydroxyquinoline can be determined by the intrinsic color of the adsorbate on PANV–KU-2 in the range of concentrations of HOQ solution in two drops 5‒100 μg.
Keywordsdiffuse reflection spectroscopy vanadium PANV–AV-17 PANV–KU-2 8-hydroxyquinoline 8-hydroxyquinoline-5-sulfonic acid ascorbic acid
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- 1.Zolotov, Yu.A., Tsizin, G.I., Dmitrienko, S.G., and Morosanova, E.I., Sorbtsionnoe kontsentrirovanie mikrokomponentov iz rastvorov. Primenenie v neorganicheskom analize (Adsorption Preconcentration of Trace Components from Solutions: Application in Inorganic Analysis), Moscow: Nauka, 2007.Google Scholar
- 2.Zolotov, Yu.A., Ivanov, V.M., and Amelin, V.G., Khimicheskie test-metody analiza (Chemical Test Methods of Analysis), Moscow: Editorial URSS, 2003.Google Scholar
- 3.Dmitrienko, S.G., Goncharova, L.V., and Runov, V.K., J. Anal. Chem., 1998, vol. 53, no. 9, p. 800.Google Scholar
- 8.Muzgin, V.N., Khamzina, L.B., Zolotavin, V.L., and Bezrukov, I.Ya., Analiticheskaya khimiya vanadiya (Analytical Chemistry of Vanadium), Moscow: Nauka, 1981.Google Scholar