Determination of Bismuth with p-Acetylarsenazo by Spectrophotometry

Abstract

In 0.090 mol/L of nitric acid medium, p-acetylarsenazo and bismuth(III) form a 2:1 purple red complex. Its maximum absorption wavelength is located at 666 nm and the apparent molar absorptivity is e_{666 nm} = 4.46 × 10⁴ L mol^-1 cm^-1. When the content of bismuth(III) is in the range of 0.50-4.5 μg/mL. The detection limit of the method is 0.13 μg/mL. The method has been successfully applied to the determination of bismuth in water sample.