Abstract: Anew high-performance trace analytical procedure with the voltammctric determination of Eu is described. The voltammetric method simply consists in the application of differental pulse voltammetry after prior intefacial accumulation by an adsorption layer of the complex Eu(Ⅲ)-XOat HMDE. In aqueous media the determination limit is 5 × 10^-10M Eu and the linear range is 5 × 10^-9——1 × 10^-6M.