Abstract
The method of analysis for trace amounts of rare earths in a matrix by cathoderay-excited emission spectroscopy has been extended to the determination of thulium in a zinc sulfide matrix, with lithium added as a charge-compensating ion. If the 478-nm emission from thulium is used as the detection wavelength, one p.p.b. can be readily determined, with an estimated detection limit of the order of 0.01 p.p.b. Thulium determinations by this means are compared with those from solid-state mass spectrometry. Effects of sample firing parameters and interferences are discussed.
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