Analytical study of bis(aroylhydrazones) of 2,6-diacetylpyridine: application to the spectrophotometric determination of antimony in non-ferrous alloys

Abstract

The properties of 2,6-diacetylpyridine bis(2-hydroxybenzoylhydrazone)(DAPBSH) and 2,6-diacetylpyridine bis(benzoylhydrazone)(DAPBBH) are described. The reaction between Sb(III) ions and DAPBBH has been studied spectrophotometrically and the resulting orange-yellow Sb-DAPBBH complex extracted into 3-methylbutan-1-ol (ε= 1.13 × 10⁴ l mol^–1 cm^–1 at 405 nm) from pH 0.5 to 5.3. The Sandell sensitivity is 0.0011 µg cm^–2 in 50 ml of aqueous solution. The method described is highly selective and has been applied satisfactorily to the determination of antimony in non-ferrous alloys.