Colour Reaction of Barium(II) with p-Acetylarsenazo

Abstract

The optimum colour conditions of p-acetylarsenazo with barium(II) were established. p- Acetylarsenazo reacted with barium(II) in pH 10.4 NH₃-NH₄Cl buffer solution to form a blue complex with a ratio of 2:1. At the maxmimum absorption wavelength 664 nm of the complex, Beer’s law was accorded in the range of 0.50-6.0 μg/mL of barium(II) amount. The apparent molar photoabsorption coefficient of the method was e₆₄₄ nm = 9.84 × 10³ L mol^-1 cm^-1. Detection limit was 0.17 μg/mL. The present method has been satisfactorily used in the determination of barium content in water sample.