Abstract
Extraction rates of palladium(II) with 2-hydroxy-5-nonyl acetophenone oxime were measured by use of a Lewis-type cell to elucidate the extraction mechanism. It was found that the rate of complex formation both at the interface and in the aqueous phase was determined by the 1:1 complex formation between trihalo complex of palladium, PdX3(H2O)– and the neutral species of β-hydroxyoxime, HR. The extraction rate of the bromo complex of palladium was faster than that of the chloro complex. The rate constants for the complex formation obtained from the extraction rate were compatible with those obtained in an 80 wt% ethanol–water mixture.
