Extraction and spectrophotometric determination of Palladium (II) with isonitroso p-methyl acetphenone phenyl hydrazone (HIMAPH)

Isonitroso p - methyl acetophenone phenyl hydrazone (HIMAPH) extracts palladium (ii) quantitatively (99.79%) into toluene from an aqueous solution of pH 0.0-5.0 and from 0.1-1M solution of acetic acid and mineral acids in the presence of 1ml of 2M solution of sodium acetate followed by digestion on boiling water bath for 4-5 minutes. The toluene extracts shows an intense peak at 470nm (? Max) and Beer's law is obeyed over the Pd (ii) concentration range of 0.1-10 mu/ml. the molar absorptivity for Pd (ii)-HIMAPH system is 13,305L mole(-1)cm(-1). the composition of extracted species is found to be 1: 2 (Pd : HIMAPH) by job's continuous variation and mole ratio method. Interference by various ions has been studied. The proposed method has been satisfactorily applied for determination of Pd(ii) in alloy and catalyst samples.