The effects of electrode type, arc current, and the Stallwood Jet on selective distillation of impurities other than rare earths in La2O3 are evaluated. Selective volatilization is reduced by use of a 20-A dc arc with a ⅛-in.-diam electrode. An analytical method incorporating these operating conditions is presented for 19 impurity elements in La2O3 prepared from the lanthanum metal sample. The overall precision is about ±14% relative standard deviation over the concentration range of 30 to 1000 parts per million.
Get full access to this article
View all access options for this article.
References
1.
WhiteheadA. B. and HeadyH. H., “Spectrographic Analysis of Cerium by a Carrier Distillation Technique,”Bureau of Mines Rept. of Invest.6091 (1962).
2.
SeimH. J.JohnsonJ. L.SteverK. R., and HeadyH. H., “Ion Exchange Separation and Instrumental Analysis of Impurities in Rare-Earth Metals,”Bureau of Mines Rept. of Invest.6097 (1962).
3.
AhrensL. H. and TaylorS. R., Spectrochemical Analysis (Addison-Wesley Publishing Co., Inc., Reading, Mass., 1961), 2nd ed.
4.
Reference to specific makes or models of equipment is made to facilitate understanding and does not imply endorsement by the Bureau of Mines.
5.
MitteldorfA. J., The Spex Speaker, Spex Industries6, No. 1 (1961).
6.
StallwoodB. J., J. Opt. Soc. Am.44, 171 (1954).
7.
DuffendackW. S. and WolfeR. A., Ind. Eng. Chem., Anal. Ed.10, 161 (1938).
