Solid-liquid separation after liquid-liquid extraction using alpha-benzilmonoxime-molten benzophenone for preconcentration and selective spectrophotometric determination of palladium

A selective method for preconcentration of palladium(II) from sulfuric acid solution using alpha -benzilmonoxime-molten benzophenone has been describe d. Palladium can be extracted quantitatively into molten benzophenone and d etermined spectrophotometrically at lambda (max)=434 nm. Optimization of va riables such as ligand concentration, acid type and its concentration, shak ing time and the others were performed. Under selected conditions Beer's la w was obeyed over 0.03-0.60 mug/mL of palladium (1.5-30 mug Pd) with a dete ction limit of 3 ng/mL. The percent RSD for 0.6, 0.32, 0.03 mug/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 o bserved. The method is accurate, selective and precise. The method has succ essfully been applied to synthetic mixtures and Pd-charcoal laboratory powd er.