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The structure and reaction dynamics in the systems UO 2   2+  -SO 4  2-  and UO 2  2+ -SO 4  2- -OH -  were investigated using EXAFS and  17 O-NMR spectroscopy. Uranium L III  edge EXAFS indicated a bidentate coordination mode of sulfate to uranyl. In solution, this is characterized by an U-S distance of 3.11 Å. Approximately 5 oxygen atoms were observed in the equatorial plane at 2.39-2.43 Å. The kinetics in the binary uranyl sulfate system can be described by four dominant exchange reactions: (1) UO 2  2+  + SO 4  2-  ⇔ UO 2 SO 4  (k 1 ), (2) U * O 2  2+  + UO 2 SO 4  ⇔ U * O 2 SO 4  + UO 2  2+  (k 2 ), (3) UO 2  2+  + UO 2 (SO 4 ) 2  2-  ⇔ 2 UO 2 SO 4  (k 3 ), and (4) UO 2 SO 4  + SO 4  2-  ⇔ UO 2 (SO 4 ) 2  2-  (k 4 ). These reactions have rate constants indicating that the exchange is not of the simple Eigen-Wilkins type.

Solution coordination chemistry of uranium in the binary UO 2 2+ -SO 4 2- and the ternary UO 2 2+ -SO 4 2- -OH - system