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Field evidence for uranium nanocrystallization and its implications for uranium transport

Murakami, Takashi*; Sato, Tsutomu*; Onuki, Toshihiko; Isobe, Hiroshi*

High-resolution transmission and scanning electron microscopies (HRTEM and SEM) both equipped with energy dispersive X-ray spectrometers (EDS) have been used to determine the chemical form of U(VI) in rocks and to examine U uptake mechanisms at low U concentrations (10$$^{8}$$$$sim$$10$$^{7}$$ mol/L) in the downgradient of the Koongarra U ore deposit in Australia. We found that uranyl-phosphate nanocrystallization, though initiated by adsorption, is a dominating mechanism of the U uptake and controls long-term U transport at low U concentrations.

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Category:Geochemistry & Geophysics

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