p-Dimethylaminebenzylidenerhodanine in methyl isobutyl ketone was employed as selective and sensitive reagent for the extraction and determination of palladium(II) in metal alloys and rocks. Beer’s Law is followed in the concentration range 0.2-2.4 m g.mL-1 of organic phase with a molar absorptivity of 3.0x10(4)L.mol-1.cm-1. The detection limit observed for aqueous solution was 0.1 mg.L-1. The extractions were performed at pH 2.4 and no interference of foreign ions such as Cu2+, Zn2+, Fe3+, Pb2+, Hg2+ ,etc., were observed in jewellery alloy and rock sample analyzed. The complex of reagent and palladium(II) was pH dependent and it should be carefully controlled during extraction. Continuous variation and mole ratio methods showed that the complex composition was 1:1.
p-dimethylaminebenzylidenerhodanine; palladium(II); extraction-spectrophotometry; rocks; metal alloy
