The determination of uranium (IV) in apatite

Trace Elements Investigations 637
This report concerns work done on behalf of the Division of Raw Materials of the U.S. Atomic Energy Commission
By:  and 



Geologic and mineralogic evidence indicate that the uranium present in apatite may proxy for calcium in the mineral structure as U(IV). An experimental investigation was conducted and chemical evidence was obtained that establishes the presence of U(IV) in apatite.

The following analytical procedure was developed for the determination of U(IV). Carbonate-fluorapatite is dissolved in cold 1.5M orthophosphoric acid and fluorapatite is dissolved in cold 1.2M hydrochloric acid containing 1.5 g of hydroxylamine hydrochloride per 100 ml. Uranium (IV) is precipitated by cupferron using titanium as a carrier. The uranium in the precipitate is separated by use of the ethyl acetate extraction procedure and determined fluorimetrically. The validity and the limitations of the method have been established by spike experiments.

Publication type Report
Publication Subtype USGS Numbered Series
Title The determination of uranium (IV) in apatite
Series title Trace Elements Investigations
Series number 637
DOI 10.3133/tei637
Year Published 1956
Language English
Publisher U.S. Geological Survey
Description 30 p.
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