Extraction-Spectrophotometric Studies on the Complex Formation of Iron(III) with 4-(2-Thiazolylazo)Resorcinol and Tetrazolium Salts

  • Kiril Blazhev Gavazov University of Plovdiv "Paissii Hilendarski"
  • Teodora S. Stefanova University of Plovdiv “Paisii Hilendarskii”, 24 Tsar Assen Street, 4000 Plovdiv
  • Galya K. Toncheva University of Plovdiv “Paisii Hilendarskii”, 24 Tsar Assen Street, 4000 Plovdiv
Keywords: Iron-TAR chelate, Solvent extraction, Ion-association, Fe(III) reduction, Linear relationship

Abstract

Four liquid-liquid extraction-chromogenic systems containing Fe(III), 4-(2-thiazolylazo)resorcinol (TAR), tetrazolium salt (TZS), water and chloroform were studied. 2,3,5-Triphenyl-2H-tetrazolium chloride (TTC), 3-(4,5-dimethyl-2-thiazol)-2,5-diphenyl-2H-tetrazolium bromide (MTT), 3-(2-naphtyl)-2,5-diphenyl-2H-tetrazolium chloride (TV), and 2-(4-iodophenyl)-3-(4-nitrophenyl)-5-phenyl-2H-tetrazolium chloride (INT) were the examined TZSs. Optimization experiments for iron extraction were performed and the following parameters were found for each system: pH(opt), CTAR(opt), CTZS(opt), shaking time (opt), and l(opt). Under the optimum conditions, the molar ratio of the reacting Fe(III), TAR and TZS is 1:2:2 and the general formula of the extracted species is (TZ+)2[FeII(TAR2–)2]. Some equilibrium constants (constants of association, constants of distribution, and constants of extraction) and analytical characteristics (molar absorptivities, Sandell’s sensitivities, Beer’s law limits, etc.) were calculated. Linear relationships involving the molecular mass of TZ+ were discussed.

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Author Biographies

Kiril Blazhev Gavazov, University of Plovdiv "Paissii Hilendarski"

Head of the Department of General and Inorganic Chemistry

Assoc. Prof. PhD

Teodora S. Stefanova, University of Plovdiv “Paisii Hilendarskii”, 24 Tsar Assen Street, 4000 Plovdiv
Department of General and Inorganic Chemistry
Galya K. Toncheva, University of Plovdiv “Paisii Hilendarskii”, 24 Tsar Assen Street, 4000 Plovdiv
Department of General and Inorganic Chemistry
Published
2014-04-04
How to Cite
Gavazov, K., Stefanova, T. S., & Toncheva, G. K. (2014). Extraction-Spectrophotometric Studies on the Complex Formation of Iron(III) with 4-(2-Thiazolylazo)Resorcinol and Tetrazolium Salts. JOURNAL OF ADVANCES IN CHEMISTRY, 10(3), 2491-2501. https://doi.org/10.24297/jac.v10i3.2291
Section
Articles