Coupling of redox and complex formation processes for the kinetic determination of palladium

Abstract

A kinetic-spectrophotometric procedure for the determination of microgram amounts of palladium(II) with pyridine-2-aldehyde 2-pyridylhydrazone (PAPH) is described. The bromate oxidation of the dye is followed at 372 nm. The method is based on the decrease in the reaction rate produced by palladium complexation of PAPH. A relative standard deviation of 2.5% was obtained in the range 0.5–3.2 µg ml^–1 of Pd. Factors influencing the sensitivity and interferences from model solutions are discussed.