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Trace Elements Investigations : The Occurrence of Columbium and Tantalum

Description: The following report is the fourth in a series of reports on rare and uncommon elements prepared by the Geological Survey. This report covers columbius and tantalus, two chemical elements belonging to the fifth group of the periodic table and quinquevalent in most of their compounds.
Date: August 8, 1983
Creator: Fleischer, Michael & Harder, James O.
Partner: UNT Libraries Government Documents Department

Preliminary Report on Methods of Analysis for very Small Percentages of Uranium

Description: Abstract: Procedures are presented in detail of two methods for the determination of very small percentages or uranium (down to 0.0025). The methods are applicable to a wide variety of materials. Notes on the methods and confirmatory experiments are also given.
Date: August 8, 1983
Creator: Foster, H. D.; Grimaldi, F. S. & Stevens, R. M.
Partner: UNT Libraries Government Documents Department