Development of a solvent extraction system with 4-heptylaminopyridine for the selective separation of palladium(II) from synthetic mixtures, catalysts and water samples

AbstractA newly reported chelating agent, 4-heptylaminopyridine has been used for selective extraction and separation of palladium(II) from salicylate media at pH 0.5 is studied. The effect of different parameters such as pH, weak organic acid concentration, extractant concentration, equilibrium time, diluents, and stripping agent has been evaluated. Successful stripping of palladium(II) from the loaded organic phase is achieved with 6.0 M ammonia (2 × 10 mL) solution. The method affords separation of palladium(II) from binary and ternary mixtures and is applicable to the analysis of synthetic mixtures, alloys, catalysts, and water samples. The method is simple, selective, cost effective, and reproducible.