Author Description

The procedures described are simple and direct. The rare-earth oxides are dissolved in nitric acid, and europium is measured in the nitrous oxide-acetylene flame. Calibration is achieved with synthetic standards. Europium is determined in phosphoric acid, after a suitable dilution, by a flameless technique and the method of standard additions for calibration. For the flame analysis, the precision is estimated to be between 2 and 5 per cent at a concentration of 0,8 per cent and, for the flameless method, about 20 per cent at a concentration of 5 ug/ml.