Spectrophotometric study on the color reaction of multicomponent complex of gallium -3, 5-dibromosalicylfluorone-CTMAB-Tween 80

In the presence of mixed surfactant cetyltrimethylammonium bromide(CTMAB) and Tween 80,the photometric analysis properties of color reaction of 3,5-dibronosalicylfluorone (DBSAF)with Gallium(Ⅲ) were studied. The experimental result was that Gallium(Ⅲ) reacted with DBSAF to form a micelle complex with maximum absorption at 561 nm in 0.46 mol/L hydrochloric acid medium. The mixed surfactant remarkably improved the sensitivity of the method and dissolubility of the complex. The apparent molar absorptivity of the complex is 3.78×10~5 L·mol~(-1)·cm~(-1)at 561 nm. Gallium(Ⅲ) reacted with DBSAF to form complex with the stoichiometric ratio of 1∶4,which was determined by mole ratio method and continual method of transformation,respectively.Beer's law was obeyed in the range of 0～400 μg Gallium(Ⅲ) per L.The proposed method has been applied to the determination of trace amount of Gallium(Ⅲ) in ore samples.