Abstract: A novel spherical macroporous epoxy-dicyandiamide chelate resin was synthesized simply and rapidly from epoxy resin and used for the preconcentration and separation of trace amounts of Au(Ⅲ), Hg (Ⅱ), Pd (Ⅳ) and Ru (Ⅲ) ions from solution samples. The analyzed ions can be quantitatively concentrated by the resin at a flow rate of 2.0 mL/min at pH 4, and can also be desorbed with 15 mL of 4 mol/L HCl+0.3 g thiourea from the resin column with recoveries of 96.5%-99.0%. After the chelate resin was reused for 7 times, the recoveries of these ions were still over 92%, and 400-1 000 times of excess of Fe(Ⅲ), Al(Ⅲ), Ni(Ⅱ), Mn(Ⅱ), Cr (Ⅲ), Cu (Ⅱ), Cd (Ⅱ) and Pb(Ⅱ) caused little interference with the determination of these ions by an inductively coupled plasma optical emission spectrometer (ICP-OES). The capacities of the resin for the analytes are in the range of 0.35～0.92 mmol/g. The RSDs of the proposed method are in the range of 1.1%～4.0% for each kind of the analyzed ions. The recoveries of a standard added in real solution samples are between 96.5 % and 98. 5 %, and the results for the analyzed ions in a powder sample are in good agreement with their reported values.

Key words: Concentration, Separation, Macroporous epoxy-dicyandiamide chelate resin, Gold, Mercury, Palladium and ruthenium