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Chemical Papers

, Volume 60, Issue 4, pp 283–287 | Cite as

Application of a ternary complex of tungsten(VI) with 4-nitrocatechol and thiazolyl blue for extraction-spectrophotometric determination of tungsten

  • V. D. Lekova
  • K. B. GavazovEmail author
  • A. N. Dimitrov
Article

Abstract

A new ternary ion-association complex of tungsten(VI), 4-nitrocatechol (NC), and 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (Thiazolyl Blue, MTT) was obtained and studied using an extraction-spectrophotometric method. The optimum pH, reagent concentrations, and extraction time were determined. The composition of the complex was found to be W(VI): NC: MTT = 1: 2: 2. The extraction process was investigated quantitatively and the key constants were calculated. The molar absorptivity of the chloroform extract at λmax = 415 nm was 2.8 × 104 dm3 mol−1 cm−1, and the Beer’s law was obeyed up to 8.8 μg cm−3 tungsten(IV). The limit of detection and limit of quantification were calculated to be 0.27 μg cm−3 and 0.92 μg cm−3, respectively. The effect of foreign ions and reagents was studied and a competitive method for determination of tungsten in products from ferrous metallurgy was developed. The residual standard deviation and the relative error were 0.53 % and 0.2 %, respectively.

Keywords

tungsten(VI) extraction spectrophotometric determination ternary complex 

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Copyright information

© Institute of Chemistry, Slovak Academy of Sciences 2006

Authors and Affiliations

  • V. D. Lekova
    • 1
  • K. B. Gavazov
    • 1
    Email author
  • A. N. Dimitrov
    • 1
  1. 1.Department of General and Inorganic ChemistryPlovdiv UniversityPlovdivBulgaria

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