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2-Hydroxyimino-3-(2-hydrazonopyridyl)-butane (HHB) was investigated as a new reagent for the flotation of palladium(II). The metal ion forms a 1:1 pale-violet complex with HHB in aqueous solution. An intense clear violet layer was formed, after flotation, by adding an oleic acid (HOL) surfactant. The composition of the float is 1:1 (Pd:HHB). A highly selective and sensitive spectrophotometric procedure was proposed for the determination of microamounts of Pd(II) as its floated complex. Thedoi:10.2116/analsci.15.433 fatcat:qcm7rzmzwndjzg3mab2nut53na