Determination of rare earths in lanthanum oxide by inductively-coupled plasma emission derivative spectrometry.
Rare-earth elements (REE) at ppm levels in lanthanum oxide can be determined without prior separation and preconcentration by use of high-resolution inductively-coupled plasma emission derivative spectrometry (ICPEDS). The calibration graphs are all linear and pass through the origin, even in the presence of large amounts of lanthanum, except those for dysprosium, holmium and ytterbium. The detection limit for each REE is 1-10 mug g in lanthanum oxide. Investigation of various physical and/or spectral interferences shows that good selectivity is obtained by ICPEDS.
Ishii
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Chemical Research Institute of Non-Aqueous Solutions, Tohoku University, Katahira, Sendai-shi, 980 Japan.
Satoh
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