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

Lekova, V. D., Gavazov, K. B. and Dimitrov, A. N. Application of a ternary complex of tungsten(VI) with 4-nitrocatechol and thiazolyl blue for extraction-spectrophotometric determination of tungsten Chemical Papers, Vol.60, No. 4, 2006, 283-287

Document type: Článok z časopisu / Journal Article
Collection: Chemical papers  

Author(s) Lekova, V. D.
Gavazov, K. B.
Dimitrov, A. N.
Title Application of a ternary complex of tungsten(VI) with 4-nitrocatechol and thiazolyl blue for extraction-spectrophotometric determination of tungsten
Journal name Chemical Papers
Publication date 2006
Year available 2006
Volume number 60
Issue number 4
ISSN 0366-6352
Start page 283
End page 287
Place of publication Poland
Publisher Versita
Collection year 2006
Language english
Subject 250000 Chemical Sciences
250200 Inorganic Chemistry
Abstract/Summary 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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