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Published online 8 September 2005
Published in J Environ Qual 34:1763-1771 (2005)
DOI: 10.2134/jeq2005.0057
© 2005 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
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Oxidative Remobilization of Biogenic Uranium(IV) Precipitates

Effects of Iron(II) and pH

Lirong Zhonga,*, Chongxuan Liua, John M. Zacharaa, Dave W. Kennedya, James E. Szecsodya and Brian Woodb

a Pacific Northwest National Laboratory, Richland, WA 99354
b Oregon State University, Corvallis, OR 97330



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  		Fig. 1. Oxidative remobilization of biogenic uraninite [UO2(s)] in bioreduced sediment suspensions with variable concentrations of Fe(II) addition at pH 4 or 5 (a), 7 (b), and 9 (c). The initial UO2(s) in the system was 16 µmol/L (3808 µg/L).

 


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  		Fig. 2. Oxidative remobilization of biogenic uraninite [UO2(s)] in the dithionite–citrate–bicarbonate (DCB)-treated sediment suspensions with variable concentrations of Fe(II) addition at pH 4 or 5 (a), 7 (b), and 9 (c). The total UO2(s) in the system was 16 µmol/L (3808 µg/L).

 


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  		Fig. 3. Bicarbonate extractable U(VI) at the termination of the biogenic uraninite [UO2(s)] oxidative remobilization experiments. DCB, dithionite–citrate–bicarbonate.

 


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  		Fig. 4. Uranium(VI) adsorption to the bioreduced-reoxidized sediment with variable concentrations of Fe(II) addition. The sediment was oxidized after Fe(II) addition and before uranyl addition for sorption experiments. The total U(VI) concentration was 10 µmol/L. (a) U(VI) adsorption edges, (b) aqueous U(VI) concentration. The lines were generated from a ferrihydrite adsorption model (see text).

 


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  		Fig. 5. Prediction of U(IV) oxidative remobilization with the ferrihydrite adsorption model. The experimental data were calculated from the average of the last four data points in each kinetic profile of the remobilization experiments in Fig. 1.

 




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