A5047249003- Radioactive element chemistry and processing
- Radioactive contamination and transfer
- Analytical chemistry methods development
- Radioactivity and Radon Measurements
- Isotope Analysis in Ecology
- Nuclear Physics and Applications
- Chemical Synthesis and Characterization
- Nuclear and radioactivity studies
- Analytical Chemistry and Sensors
- Laser-induced spectroscopy and plasma
- Geochemistry and Geologic Mapping
- Mass Spectrometry Techniques and Applications
- Electrochemical Analysis and Applications
- Analytical Chemistry and Chromatography
- Water Quality Monitoring and Analysis
- Geological and Geochemical Analysis
- Graphite, nuclear technology, radiation studies
- Animal Virus Infections Studies
- Molecular Sensors and Ion Detection
- Pesticide Residue Analysis and Safety
- Phosphorus and nutrient management
- Microfluidic and Capillary Electrophoresis Applications
- Air Quality Monitoring and Forecasting
- Nuclear Materials and Properties
- Advanced Fiber Optic Sensors
Oak Ridge National Laboratory
2011-2022
Oak Ridge Associated Universities
2021
IONICS Mass Spectrometry (Canada)
2007
Tulane University
1985
A fully automated method for the separation of low-concentration uranium from plutonium in environmental swipe samples has been developed. The offline chromatography system features renewable 1 mL Eichrom TEVA and UTEVA column generation bulk resin slurry. Discrete fractions separated actinides are delivered into user defined vials future analysis. Clean room background levels were achieved outside a cleanroom environment with this method. Purification various sample matrixes at...
The collection of solid particulates and liquids from surfaces by the use cloth swipes is fairly ubiquitous. In such methods, there a continuous concern regarding ability to locate quantitatively sample analyte species material. this effort, we demonstrate initial coupling an Advion Plate Express plate reader liquid sampling-atmospheric pressure glow discharge (LS-APGD) microplasma ionization source with Orbitrap mass spectrometer perform uranium isotopic analyses solution residues on cotton...
The ability to directly measure uranium isotope ratios on environmental swipes has been achieved through a solution-based microextraction process and represents significant advancement toward the development of rapid method analyze international nuclear safeguard samples. Here, probe is lowered sealed onto swipe surface, analytes within sampling site (∼8 mm2) are dissolved extracted into flowing solvent 2% nitric acid (HNO3). mobilized species subsequently directed an inductively coupled...
Since the current methodology mandated by environmental protection agency (EPA) for determination of isotope ratios priority metals in sediments, sludges, and soils is both time consuming labor intensive, it would clearly be great value surveys if there were a procedure capable direct analysis these materials with little or no sample preparation. A method that holds promise this regard glow discharge mass spectrometry (GDMS). GDMS has several characteristics make worthy evaluation;...
Automated introduction platforms integrated with inductively coupled plasma optical emission spectroscopy (ICP-OES) systems are continuously being improved. Expanding on the systems, a newly developed automated ion chromatography system was explored for performing rapid in-line separations to ICP-OES detection of trace elements in uranium. Trace separated from uranium material and analytes directed into subsequent detection. Detection parameters such as exposure time frequency, wavelength...
This study demonstrates a method for determining the isotopic composition of low-level (sub-pg) plutonium (Pu) directly from cotton swipe.
Plutonium is shown to be retained on anodized glassy carbon (GC) electrodes at potentials positive of +0.7 V (vs Ag/AgCl reference) and released upon potential shifts values negative +0.3 V. This phenomenon has been exploited for the separation, concentration, detection plutonium by coupling an electrochemical flow cell on-line with ICPMS system. The electrochemically controlled deposition analysis Pu improves limits analyte preconcentration matrix isobaric ion elimination. Information...
SUMMARY Sindbis virus maturation is inhibited by low NaCl medium in chick embryo cells and one strain of BHK cells, but not another which has a different passage history. The plasma membrane the resistant to higher ratio cholesterol phospholipid than other cells. Cholesterol-containing liposomes, cholesterol-free can release from NaCl-inhibited These results suggest that may block mechanism influenced phospholipid.
Purification of plutonium, uranium, and titanium from high-purity graphite for high precision isotopic analysis <italic>via</italic> MC-ICP-MS.