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.