SOLID–LIQUID SEPARATION AFTER LIQUID–LIQUID EXTRACTION USING α-BENZILMONOXIME-MOLTEN BENZOPHENONE FOR PRECONCENTRATION AND SELECTIVE SPECTROPHOTOMETRIC DETERMINATION OF PALLADIUM

Abstract

A selective method for preconcentration of palladium(II) from sulfuric acid solution using α-benzilmonoxime-molten benzophenone has been described. Palladium can be extracted quantitatively into molten benzophenone and determined spectrophotometrically at λ_max = 434 nm. Optimization of variables such as ligand concentration, acid type and its concentration, shaking time and the others were performed. Under selected conditions Beer's law was obeyed over 0.03–0.60 μg/mL of palladium (1.5–30 μg Pd) with a detection limit of 3 ng/mL. The percent RSD for 0.6, 0.32, 0.03 μg/mL of Pd(II) were found as 0.7, 1.1 and 6.4 respectively. Effect of different ions on the determination of palladium were examined. No serious interference was observed. The method is accurate, selective and precise. The method has successfully been applied to synthetic mixtures and Pd-charcoal laboratory powder.

Keywords:

• Palladium
• α-Benzilmonoxime
• Benzophenone
• Solid–liquid separation
• Spectrophotometry

Acknowledgments