Wang Jun, Lü Wen-Ying, Li Quan-Min, Yang Lin
College of Chemistry and Environmental Science, The Key Laboratory of Environmental Pollution Control Technology of Henan Province, Henan Normal University, Xinxiang 453002, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2004 Aug;24(8):995-8.
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.
