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- Author or Editor: R. Bulâceanu x
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Abstract
Well water analysis was carried out starting with liquid samples which have been evaporated to dryness. The salt deposit crust has ensured an enrichment in microelements which were approximately determined by emission spectroscopy. Once the order of magnitude was established, the exact measurements were carried out based on the following techniques: mass spectrometry, atomic absorption spectrophotometry, activation with slow neutrons, and γ-spectrometry. The results obtained are the average values of at least three methods employed. *** DIRECT SUPPORT *** A1353055 00005
Abstract
In order to determine uranium from raw phosphoric acid solutions, resulted by the sulphuric acid attack of phosphate rocks and the strip solutions of the solvent extraction process for uranium recovery, two classes of analytical methods were established: one for low uranium content in phosphoric acid, and the other for higher uranium concentration in the same medium. The study was based on specific methods, therefore interference probability with other impurities in phosphoric acid medium is low. In the first class, X-ray fluorescence and spectrophotocolorimetric methods were used. X-ray fluorescence was applied on direct raw phosphoric acid solution and raffinate. The last one was associated with solvent extraction [di-(2-ethylhexyl) phosphate + triocylphosphine oxide] on the U(IV)-Arsenazo III complex in strip. The methods of the second class, were used for strip uranium concentrated solutions: X-ray fluorescence isotopic dilution and mass spectrometry, spectrophotocolorimetry and activation analysis associated with gamma-spectrometry. Here spectrophotocolorimetry involves two methods. The first one is based on the U(IV)-Arsenazo III complex and the other on direct U(IV)—phosphoric acid solutions measurements. A good agreement was obtained in each case for all comparative measurements involving various methods.
