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Extraction-Chromogenic Systems for Gallium(III) Based on Azo Dyes and Xylometazoline Hydrochloride

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Abstract

Two liquid-liquid extraction-chromogenic systems for GaIII based on azo dyes (ADs) and xylometazoline hydrochloride (XMH) have been studied. The ADs used were 4-(2-pyridylazo)resorcinol (PAR) and 4-(2-thiazolylazo)resorcinol (TAR). The optimum conditions (pH, AD concentration, XMH concentration, and extraction time) for the formation of ternary complexes of general formula (XMH+)[GaIII(AD2–)2], that are readily extracted into chloroform, have been worked out. The following extraction-spectrophotometric characteristics: absorption maxima (λ), molar absorptivities (ελ), limits of detection (LOD), limits of quantitation (LOQ), constants of extraction (Kex), and fractions extracted (E) have been determined. The system in which AD = PAR has better performance: ε512 = 9.9×104 dm3 mol–1 cm–1, LOD = 2.8 ng/cm3, LOQ = 9.4 ng/cm3, log Kex = 4.1, and E = 97%. Extraction equilibrium with this reagent is achieved in a short time (only a few seconds) and the optimum pH interval is broad (5.1–7.8).

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Funding

This study is part of the project (DPDP-24) within the framework of a scientific contest “Doctoral and postdoctoral projects-2019” at the Medical University-Plovdiv.

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Authors and Affiliations

  1. Department of Chemical Sciences, Medical University of Plovdiv, 4004, Plovdiv, Bulgaria

    P. V. Racheva, D. G. Hristov & K. B. Gavazov

  2. Research Institute at the Medical University of Plovdiv, 4004, Plovdiv, Bulgaria

    P. V. Racheva & K. B. Gavazov

Authors
  1. P. V. Racheva
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  2. D. G. Hristov
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  3. K. B. Gavazov
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Correspondence to K. B. Gavazov.

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Racheva, P.V., Hristov, D.G. & Gavazov, K.B. Extraction-Chromogenic Systems for Gallium(III) Based on Azo Dyes and Xylometazoline Hydrochloride. Russ J Gen Chem 90, 1351–1356 (2020). https://doi.org/10.1134/S1070363220070245

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