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UV-Visible spectroscopy can be utilized in an on-line fashion to directly measure the concentration and speciation of special nuclear materials, such as uranium and plutonium, thus allowing real-time process control and tracking for the solvent extraction processes. Attributing UV-Visible data to process conditions is complex due to uranyl nitrate speciation, thus efforts focus on characterizing the system encompassing 0.01–1.26 M U and 0.01-8 M HNO3. Results suggest dominant speciation changes from low (0.01 M) to high (>6 M) HNO3, and peak shifts in the high (>1 M) uranyl system imply an ingrowth of species not present at lower uranyl concentrations.
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Warburton et al. (2010) studied this question.
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