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Color reactions of vanadium(V) with 8-hydroxyquinoline-5-sulfonic acid and ascorbic acid on PANV–AV-17 disks

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Abstract

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.

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Authors and Affiliations

  1. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, Moscow, 119991, Russia

    O. P. Shvoeva, V. P. Dedkova & A. A. Grechnikov

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  1. O. P. Shvoeva
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  2. V. P. Dedkova
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  3. A. A. Grechnikov
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Correspondence to V. P. Dedkova.

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Original Russian Text © O.P. Shvoeva, V.P. Dedkova, A.A. Grechnikov, 2017, published in Zhurnal Analiticheskoi Khimii, 2017, Vol. 72, No. 7, pp. 628–632.

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Shvoeva, O.P., Dedkova, V.P. & Grechnikov, A.A. Color reactions of vanadium(V) with 8-hydroxyquinoline-5-sulfonic acid and ascorbic acid on PANV–AV-17 disks. J Anal Chem 72, 734–738 (2017). https://doi.org/10.1134/S1061934817070115

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  • DOI: https://doi.org/10.1134/S1061934817070115

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