Spectrophotometric Determination of Gallium(III) as Bipyridylglyoxal bis(4-Phenyl-3-thiosemicarbazone) Derivative

Abstract

A new simple spectrophotometric method is developed for the determination of gallium. The reagent bipyridyl glyoxal bis(4-phenyl-3-thiosemicarbazone) reacts with Hg(II), V(V), Ru(IV), Ga(III), In(II), and Pt(II) to develop colour in aqueous N,N-dimethylformamide media with maximum absorbance within pH range 2-5. The composition of the metal chelates was examined by variation of the metal: ligand mole ratio. The molar absorptivity was observed within 1.8 × 10^-3 to 4.6 × 10^-4 L mol^-1 cm^-1 within 390-448 nm. The linear calibration curves were observed with 0.2 to 20 μg/mL. Highest molar absorpitivity was indicated by gallium(III) with detection limit 0.022 μg mL^-1. The proposed method was successfully applied for the determination of gallium(III) from semiconductor and medicinal drug.