Spectrophotometric determination of aluminum in river water with bromopyrogallol red and n-tetradecyltrimethylammonium bromide by flow injection analysis

In the proposed flow injection system, the reagent solution contains bromopyrogallol red, n-tetradecyltrimethylammonium bromide and hexamine in 60% ethanolic solution, and the carrier solution contains acetate buffer, 1,10-phenanthroline and hydroxylammonium chloride. Sample solutions (160 μl) acidified by sulfuric acid are injected and the peak absorbance at 623 nm is recorded. The detection limit is about 0.001 ppm and calibration plots are linear for the ranges 0–0.3 and 0–0.1 ppm aluminum.