STUDIES ON MONOXIDE EMISSION-SPECTROMETRY OF RARE-EARTH ELEMENTS - PART-V - DETERMINATION OF DY IN RARE-EARTH CONCENTRATES BY DUAL-WAVELENGTH METHOD

The enhancement effect of Pr, Y, Eu and La on the determination of Dy by air-acetylene flame monoxide flame emission spectrometry is reporte d. The dual wavelength method (526.3 nm as the analytical wavelength a nd 526.7 nm as the reference wavelength) was used to eliminate spectra l interferences. A new method was established for direct determination of Dy (about 4%) in rare-earth mixture concentrates using Pr as enhan cing agent and chemical interference inhibitor. The detection limit is 0.4 mu g ml(-1) Dy and the linear range is; 5-900 mu g ml(-1) Dy.