Determination of trivalent europium using flow injection chemiluminescence method

A simple flow injection chemiluminescence (CL) analysis method for the determination of europium, in mineral samples is reported. It is based on luminescence produced by NaIO4-H2O2 CL system sensitized by [Eu(EDTA)](-). The relative chemiluminescence intensity of the Eu3+-EDTA-NaIO4-H2O2 system is proportional to the amount of Eu3+. The optimized experimental conditions were investigated. The linear range and detection limit for Eu3+ are 2.0 x 10(-7) to 1.0 X 10(-5) and 6.2 x 10(-8) M, respectively. The sample throughput of the method is 80 samples/h. This method was successfully applied to the determination of europium in rare earth oxides. And the mechanism of chemiluminescence is proposed. (C) 2003 Elsevier B.V. All rights reserved.