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

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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.

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Authors and Affiliations

  1. Department of General and Inorganic Chemistry, Plovdiv University, 4000, Plovdiv, Bulgaria

    V. D. Lekova, K. B. Gavazov & A. N. Dimitrov

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  1. V. D. Lekova
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  2. K. B. Gavazov
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  3. A. N. Dimitrov
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Correspondence to K. B. Gavazov.

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Lekova, V.D., Gavazov, K.B. & Dimitrov, A.N. Application of a ternary complex of tungsten(VI) with 4-nitrocatechol and thiazolyl blue for extraction-spectrophotometric determination of tungsten. Chem. Pap. 60, 283–287 (2006). https://doi.org/10.2478/s11696-006-0049-1

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  • DOI: https://doi.org/10.2478/s11696-006-0049-1

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