Abstract
N, N′-Diphenylpropanedithioamide (DPDTA) forms a stable 1:2 (metal:ligand) complex with palladium(II), which is quantitatively extracted from aqueous solutions of pH 1.5-5.8 into toluene, the extract having an absorption maximum at 357nm. Beer′s law is obeyed over the range 0.1-2.0μg ml-1 of palladium. The apparent molar absorptivity is 4.76×104M-1 cm-1. A sensitive and selective extraction-spectrophotometric method for the determination of micro amounts of palladium has been proposed. Further, the equilibria and kinetics of the extraction of palladium(II) with toluene solutions of DPDTA have been studied. The partition coefficient of DPDTA and the extraction constant of its palladium(II) complex between an aqueous and a toluene phase were determined to be 103, 13 and 107.56, respectively. The reaction orders of the rate of the complexation reaction of palladium(II) with DPDTA in the extraction were +1, 0 and +1 with respect to the concentrations of palladium(II), hydrogen ion and DPDTA, respectively. Kinetic data and activation parameters for the reaction have also been determined.
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