Supercritical fluid extraction of uranium and thorium from nitric acid solutions with organophosphorus reagents

Article Abstract:

A method for extracting uranium and thorium from nitric acid solutions with organophosphorus reagents is examined. Organophosphorus reagents are first dissolved in supercritical carbon dioxide by passing the fluid through a reagent vessel placed upstream of the sample vessel in the extractor. When the extraction is complete, the sample is removed from the extraction cell and analyzed by neuron activation analysis. The amount of uranium and thorium ions remaining in the solution after extraction provides a measure of the reagents' extraction efficiency.

Methods, Supercritical fluid extraction, Organophosphorus compounds, Organic phosphorus compounds

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Evidence for thorium isotopic disequilibria due to organic complexation in natural waters

Article Abstract:

The complexation of thorium and its precursors with humic and fulvic acids in natural waters can cause significant isotopic disequilibria in aqueous solution. The resulting macromolecular complexes may be preferentially transported to groundwater where disequilibria due to the complexation and transport is directly observable. Thus, the thorium isotopes may prove useful as natural tracers for the study of radionuclide migration in surface and underground waters.

Research, Water, Water analysis, Radioisotopes

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Potential air quality effects of using ethanol-gasoline fuel blends: a field study in Albuquerque, New Mexico

Article Abstract:

The use of ethanol fuels in automobiles appears to lead to increasing winter concentrations of aldehydes and peroxyacetyl nitrate, which are reactive in the atmosphere. The research, which was conducted in Albuquerque, NM, determined that the measured aldehyde concentrations were mostly due to anthropogenic sources, although there was some impact due to the oxidation of natural hydrocarbons through photochemical processes.

Environmental aspects, Alcohol fuels, Synthetic fuels

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