SPECTROPHOTOMETRIC DETERMINATION OF PALLADIUM USING BROMO-SULPHONAZO Ⅲ AS CHROMOGENIC REAGENT

A method of spectrophotometric determination of palladium was proposed on the basis of the chromogenic reaction of Pd(Ⅱ) with bromo-sulphonazoⅢ (Br-SAⅢ) in a medium of pH 2.9 buffer solution to form a blue complex with an apparent molar absorptivity of 6.375×104L·mol-1·cm-1 at 623.7 nm.The composition of the color complex was determined by the method of molar ratio and the method of continuous variation.Beer′s law was obeyed in range of 0-32 μg Pd in 25 mL solution.Detection limit of the method was 2.13 μg·L-1 for Pd.The proposed method has been applied to the determination of Pd-catalyst giving results in consistency with the results obtained by AAS method.