Determination of ultratrace concentrations of uranium and thorium in natural waters by x-ray fluorescence [electronic resource].
- Oak Ridge, Tenn. : Oak Ridge National Laboratory, 1981.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
- Physical Description:
- Pages: 9 : digital, PDF file
- Additional Creators:
- Oak Ridge National Laboratory and United States. Department of Energy. Office of Scientific and Technical Information
- Restrictions on Access:
- Free-to-read Unrestricted online access
- An x-ray fluorescence method for the simultaneous determination of uranium and thorium at the less than 1 ppM level in natural waters is described. Uranium and thorium are coprecipitated with an internal standard, yttrium, and incorporated into an iron-aluminum hydroxide carrier. The hydroxide precipitate is filtered, and the filter disk is analyzed by the energy-dispersive x-ray fluorescence technique. Matrix interferences caused by the presence of unpredictable anions and cations are compensated for by the internal standard. The U/Y and Th/Y ratios are linear over the 5- to 100-..mu..g range of interest, and the detection limit of each element on the filter disk is 2 ..mu..g (3 sigma). Relative standard deviation was 17% at the 15-..mu..g and 4% at the 100-..mu..g level for thorium and 11% at the 11-..mu..g and 2% at the 100-..mu..g level for uranium. Analysis of spiked solutions showed a recovery of 19.6 +- 0.3 ..mu..g for uranium and 19.8 +- 0.3 ..mu..g for thorium at the 20-..mu..g level, and the normal lower reporting limit is 5 ..mu..g. Fifty disks can be routinely measured during a normal working day.
- Report Numbers:
- E 1.99:conf-810647-6
- Other Subject(s):
- X-Ray Fluorescence Analysis
- Aqueous Solutions
- Calibration Standards
- Ground Water
- Surface Waters
- Trace Amounts
- Chemical Analysis
- Hydrogen Compounds
- Nondestructive Analysis
- Oxygen Compounds
- Separation Processes
- X-Ray Emission Analysis
- Published through SciTech Connect.
Conference on X- and gamma-ray sources and applications, Ann Arbor, MI, USA, 10 Jun 1981.
Stewart, J.H. Jr.; Brooksbank, R.D.
- Funding Information:
View MARC record | catkey: 14397464