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  • Title: [Spectrophotometric study on the color reaction of multicomponent complex of tungsten-3,5-dibromosalicyl fluorone-CTMAB-Tween80].
    Author: Wang J, Lü WY, Li QM, Yang L.
    Journal: Guang Pu Xue Yu Guang Pu Fen Xi; 2004 Aug; 24(8):995-8. PubMed ID: 15766129.
    Abstract:
    In the presence of mixed surfactant cetyl trimethyl ammonium bromide(CTMAB) and Tween80, the photometric analysis properties of color reaction of 3,5-dibronosalicyl fluorone (DBSAF) with tungsten(VI) were studied. The experimental result showed that tungsten(VI) reacted with DBSAF to form a micelle complex with a maximum absorption at 527 nm in a 0.60 mol x L(-1) hydrochloric acid medium. The mixed surfactant remarkably improved the sensitivity of the method and the dissolubility of the complex. The apparent molar absorptivity of the complex is 2.64 x 10(5) L x mol(-1) x cm(-1) at 527 nm. Tungsten (VI) reacted with DBSAF to form a complex with a stoichiometric ratio of 1:2, which was determined by mole ratio method and continual method of transformation, respectively. Beer's law was obeyed in the range of 0-400 microg tungsten (VI) per L. The proposed method has been applied to the determination of trace amount of tungsten in alloy steel samples.
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