Separation/preconcentration of trace rare earth elements by micro-column packed with immobilized 1-phenyl-3-methyl-4-bonzoil-5-pyrazone on nanometer Al2O3 and their determination by inductively coupled plasma-atomic emission spectrometry

Using a micro-column packed with immobilized 1-phenyl-3-methyl-4-bonzoil-5- pyrazone(PMBP) on nanometer Al2O3 powder as the adsorption material, the adsorption and elution behaviors of rare earth ions (Sc3+ Y3+ and La3+) on the above material under dynamic conditions were studied with inductively coupled plasma-atomic emission spectrometry. The conditions for preconcentration of rare earth ions were optimized, and the results show that the studied ions can be adsorbed quantitatively on the above material at pH = 4. 5 and the analytes adsorbed on the column can be eluted with 0.5 mol/L HCl solution. The detection limits of the method for Sc, Y and La were 0.16 mu g/L, 0.19 mu g/L and 0.39 mu g/L, respectively; and the relative standard deviation were 2.7%, 3.2% and 1.6%, respectively(n =9, C =0. 5 mg/L). The proposed method was applied to the determination of trace amount of Sc,Y and La in GBW 07605 Tea leaves and the determined values were in good agreement with the certified values.