Separation and preconcentration combined with glow discharge atomic emission spectrometry for the determination of rare earth elements (La,Nd,Eu,Dy,Y)in geological samples

摘要

A method of glow discharge atomic emission spectroscopy (GD-AES) is described for the determina-tion of rare earth elements (REEs) after separation and pre-concentration by micro-column packed with immobilized I ~ (PMBP) on mi-crocrystalline naphthalene. The graphite electrode with solution residue on its surface was used as a cathode. Var-ious factors (the form of cathode, working condition) in-fluencing the determination of the analytes were studied in detail. Under the experimental conditions selected, the detection limits for the determination of La, Nd, Eu; Dy and Y are 0.24, 0.32, 0.01, 0.07 and 0.06 jig/mL, respec-tively, with relative standard deviations (RSDs) in the range of 5—10%. The method was applied to determine La, Nd, Eu, Dy and Y in geological samples, and the ana-lytical results are in good agreement with the reference values.