Extraction-spectrophotometric determination of palladium(II) with 3,5-dichlorosalicylaldehyde-4-phenyl-3-thiosemicarbazone

Abstract

A method for the extraction-spectrophotometric determination of palladium with 3,5-dichlorosalicylaldehyde-4-phenyl-3-thiosemicarbazone (CSAPS) is described. The method is based on the formation of an insoluble palladium(II)-CSAPS complex, which is extractable into chloroform from an aqueous solution at pH 0. The absorbance is measured at 410 nm and the molar absorptivity is 14300 l mol^–1 cm^–1. The complex system conforms to Beer's law for up to 8 p.p.m. of palladium(II). The method has been applied successfully to the determination of palladium in standard palladium carbon powder (palladium catalyst).