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

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 ( epsilon = 1.13 x 10 exp 4 l/mol cm at 405 nm) from p H 0.5 to 5.3. The Sandell sensitivity is 0.0011 mu g/cm exp 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. 18 ref.--AA