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Published online 25 January 2007
Published in J Environ Qual 36:363-372 (2007)
DOI: 10.2134/jeq2006.0058
© 2007 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
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Quantifying Constraints Imposed by Calcium and Iron on Bacterial Reduction of Uranium(VI)

Brandy D. Stewart, Jim Neiss and Scott Fendorf*

Dep. of Geological and Environmental Sciences, Stanford Univ., Stanford, CA 94305


Figure 1
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  		Fig. 1. Temporal changes in uranyl concentration induced by S. putrefaciens at Ca concentrations ranging from 0 to 0.8 mM in the presence of (A) ferrihydrite, (B) goethite, (C) hematite, and (D) Fe (hydr)oxide-free system.

 

Figure 2
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  		Fig. 2. Temporal changes in Fe(aq) concentration induced by S. putrefaciens in the presence of ferrihydrite.

 

Figure 3
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  		Fig. 3. First-order rate plots of uranyl depletion for (A) ferrihydrite, (B) goethite, (C) hematite, and (D) Fe (hydr)oxide-free system.

 

Figure 4
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  		Fig. 4. Relation between observed pseudo first-order rate coefficient and aqueous Ca concentrations for ferrihydrite, goethite, hematite, and Fe (hydr)oxide-free systems.

 

Figure 5
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  		Fig. 5. Uranium remaining in solution as a function of calcium concentrations for Fe(III) (hydr)oxide type at (A) 9 h, (B) 97.5 h, (C) 171 h, and (D) 528 h.

 




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