SIMULTANEOUS DETERMINATION OF RUTHENIUM, OSMIUM AND PALLADIUM BY REVERSED-PHASE HPLC USING 4 (2'-THIAZOLYLAZO) RESACETOPHENONE OXIME AS CHELATING REAGENT/

The chelates of Ru, Os and Pd with 4-(2'-thiazolylazo) resacetophenone oxime were separated simultaneously by HPLC using a pre-column deriva tization method, at the wavelength 560 nm, on an octadecyl-bonded sili ca stationary phase with a mobile phase methanol-water mixture (40-60 v/v) containing 40 mM of acetate buffer pH 5.0. The detection limits f or Ru, Os and Pd were 2.0, 4.0 and 0.2 ng, respectively. The method ha s been applied successfully for the determination of metal ions in an anode slime.