Extraction of Pd(II) by some petrochemical products from nitrate media

Liquid-liquid extraction of divalent palladium - labelled with 109Pd - by solutions of Diesel oil (D.O.) and gas oil II(G.O.II) in benzene and lacquer petroleum from nitrate media has been studied. Palladium in concentrations of approximately 10-3M is very effectively extracted by dilute solutions of extraction reagents and the distribution of palladium is almost independent of the acidity and nitrate concentration of the aqueous phase. Of other common salts, chlorides, thiocyanates and nitrites affect the palladium distribution. In many cases high concentrations of salts completely suppress the extraction of palladium. The rate of palladium extraction by dilute solutions of extractants is relatively small. Some substances such as dimethyl sulfoxide (DMSO) - labelled with 35S - were found to accelerate the extraction. Palladium extraction from nitric acid media also has been studied from the points of view of chemical and radiation stability. Diesel oil was found to be a more stable extraction reagent in acid media than gas oil II. (author)