Affiliation:
1. U. S. Geological Survey, Washington, D. C. 20242
Abstract
A combined chemical x-ray fluorescence method is described for determining rare-earth elements in small amounts of complex rare-earth minerals. These elements yield a complex x-ray spectrum in which many of the analytical emission Lα lines of a given element coincide with the Lβ and/or Lγ lines of a lighter rare-earth element several atomic numbers removed. The proposed analytical scheme corrects for these interferences. Sixteen elements consisting of the lanthanides, yttrium, and scandium can be determined on as little as a 1-mg portion of the separated oxides. The oxides are dissolved in 1 ml of dilute acid, absorbed onto cellulose powder and pressed into a pellet for x-ray excitation. Chemically analyzed geologic standards are not required for calibration.
Subject
Spectroscopy,Instrumentation
Reference6 articles.
1. Banks C. V. and Klingman D. W., The Rare Earths, Spedding F. H. and Doane A. H., Eds. (John Wiley & Sons, Inc., New York, 1961), Ch. 23, pp. 570–593.
2. X-Ray Fluorescence of Rock Samples as Applied to Geological Problems
3. Systematic variation of rare earths in monazite
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