engleski

Simultaneous Determination of Palladium(II) and Gold(III) in Mixtures by Third Derivative Spectrophotometry using 3-Hydroxy-2-Methyl-1-Phenyl-4-Pyridone Ligand

A spectrophotometric method has been developed for the determination of microgram amounts of palladium(II). The method is based on the extraction of palladium(II) by chloroform solution containing 3-hydroxy-2-methyl-1-phenyl-4-pyridone (HX). Palladium(II) was highly extracted with HX from aqueous sulphuric acid media. The extraction took place in the pH range 1.5-3.0. The chloroform layer was applicable for the spectrophotometric determination of palladium(II). Molar absorptivity was 1.89´104 mol-1 dm3 cm-1 at 345 nm. The use of third-derivative spectrophotometry enables the determination of palladium(II) and gold(III) in their mixture without previous separation. Palladium(II) was thus determined in the range 0.28-8.0 mg cm-3 (in presence of 1.0-8.0 mg cm-3 gold), and gold(III) was determined in the concentration range 1-13.0 mg cm-3 (in presence of 1-5 mg cm-3 of palladium). The method was successfully applied for the determination of palladium in synthetic mixtures and in Pd-charcoal.

extraction; third-derivative spectrophotometry; gold; 3-hydroxy-2-methyl-1-phenyl-4-pyridone; palladium.

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