EXTRACTION-SPECTROPHOTOMETRIC DETERMINATION OF PALLADIUM WITH 3-THIOPHENALDEHYDE-4-PHENYL-3-THIOSEMICARBAZONE

A highly selective spectrophotometric method is described for the determination of palladium, using 3-thiophenaldehyde-4-phenyl-3-thiosemicarbazone (TAPS). The method is based on the formation of an insoluble palladium(II)-TAPS complex, which is extractable into chloroform from 1 M sulfuric acid medium after shaking for 10 min. The complex system conforms to Beer's law over the concentration range 0.4-6 mug ml-1 of palladium. The proposed method has been satisfactorily applied to the determination of palladium in brazing filler metals. (C) 1994 Academic Press, Inc.