A New Carrier for Direct Spectrographic Determination of Trace Alkalies and Alkaline Earths in High Purity Thorium Oxide
作者:
R. Venkatasubramanian,
期刊:
Analytical Letters
(Taylor Available online 1981)
卷期:
Volume 14,
issue 9
页码: 731-740
ISSN:0003-2719
年代: 1981
DOI:10.1080/00032718108081434
出版商: Taylor & Francis Group
关键词: Emission Spectroscopy;Carrier-Distillation;impurities in Thoria
数据来源: Taylor
摘要:
A d.c. arc emission spectrographic method is described for the determination of sub ppm levels of Ba, Li and Sr and ppm levels of Cs, K and Na in high purity thorium oxide. The method which employs RbCl as carrier is simple and rapid and does not involve the use of any special atmosphere for exciting the sample. It was observed that RbCl shows definite improvement over AgCl in carrier action. The carrier distillation technique reported makes possible the following range of estimations: Li: 0.02 – 5.0 ppm, Ba, Sr: 0.5 – 20 ppm, Cs: 2–50 ppm, K,Na: 5–100 ppm. The detection limit obtained by this method for Li and Sr is lower than that obtained by the earlier carrier-distillation methods reported as well as other direct sensitive techniques of Zeidel and Avni for the analysis of Tho2. The precision of the method ranges from 8% for Cs to 17% for Ba. Volatilization studies on the choice of carrier material are presented.
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