Uranium Hydr oxides

1 Commercial UO2 from ABB Atom (later Westinghouse Atom) Properties Depleted (0.25% enrichment), O U molar ratio 2.08-2.15, BET specific surface area 5.3 m7g [590]. 

3 Thermal Decomposition of Ammonium Diuranate at 600°C in H2 + 0.4% HjO-Gas Mixture Cooled in H2 for 3 h. Ground and water-washed. 

H2 Water-quenched. Ground and water-washed. Properties Cubic [2146]. 

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Other examples of redox-sensitive elements include heavy elements such as uranium, plutonium, and neptunium, all of which can exist in multiple oxidation states in natural waters. Redox conditions in natural waters are also indirectly important for solute species associated with redox-sensitive elements. For example, dissolution of iron (hydr)oxides under reducing conditions may lead to the solubilization and hence mobilization of associated solid phase species, e.g. arsenate, phosphate (see Sections 3.3.2.1, 3.3.3.2, and 3.3.4.1). 

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