title: [Spectrophotometric study on the color reaction of multicomponent complex of tungsten-3,5-dibromosalicyl fluorone-CTMAB-Tween80].
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.
authors.affiliation: College of Chemistry and Environmental Science, The Key Laboratory of Environmental Pollution Control Technology of Henan Province, Henan Normal University, Xinxiang 453002, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Wang
authors.forename: Wen-Ying
authors.initials: WY
authors.lastname: Lü
authors.forename: Quan-Min
authors.initials: QM
authors.lastname: Li
authors.forename: Lin
authors.initials: L
authors.lastname: Yang