Determination of impurities in rare-earth compounds

Summary Non-rare-earth impurities are determined in pure-rare-earth compounds by atomic absorption spectrometry, voltammetry and inductively coupled plasma emission spectrometry, respectively. The analytical results and the problems of quality control and of purity certification of rare-earth compounds are discussed. The methods used are suitable for the determination of the most important trace elements in the range of low concentrations without preconcentration.Dedicated to Prof. Dr. G. Schulze on the occasion of his 60th birthday