Abstract
A phenylurea derivative of a trident molecule has been prepared as a novel solvent extraction reagent for precious metal ions to compare the extraction ability of precious and base metals with the corresponding monopodal analogue in nitrate media. The phenylurea type of trident extraction reagent exhibited extractive selectivity for palladium over other precious and base metals in nitrate media. The extraction ability of the trident extraction reagent for palladium was superior to that of the monopodal analogue. The extraction mechanism of palladium with the trident extraction reagent was determined by slope analysis and from the peak shift for the FT-IR and 1H-NMR spectra of the extraction reagent before and after metal loading. Stripping from the organic phase after forward extraction was carried out to separate palladium and silver.
