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
- Roy S. Clarke Jr. and Zalman S. Altschuler
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.
Additional publication details
- Publication type:
- Publication Subtype:
- USGS Numbered Series
- The determination of uranium (IV) in apatite
- Series title:
- Trace Elements Investigations
- Series number:
- Year Published:
- U.S. Geological Survey
- 30 p.