-edge

bio.anl.gov

U L3-edge EXAFS at Environmentally Relevant Concentrations

Species Concentration (µM)

10

8

6

4

2

UO 2

2+

UO 2 OH + UO 2 CO 3,aq

UO 2 (CO 3 ) 2

2- UO 2 (CO 3 ) 3

4-

UO 2

2+

I = 0.05 M

U tot = 10 µM

TIC = 10 mM

UO

UO 2 (OH) 2 OH +

2,aq

UO 2 (OH) 2,aq

Consideration of the Ca-

UO 2 -CO

3 complex results in

a major shift in species

distribution at pH > 5.

0

4 5 6 7 8 9

pH

10

Ca 2 UO 2 (CO 3 ) 3,aq

Ca

Ca

Species Concentration (µM)

8

6

4

2

UO 2 CO 3,aq

UO 2 (CO 3 ) 2

2-

I = 0.05 M

U tot = 10 µM

TIC = 10 mM

Ca = 5 mM

UO 2 (CO 3 ) 3

4-

Ca

0

4 5 6 7 8 9

pH

Shelly D. Kelly, NSLS Users Meeting 2003

More magazines by this user
Similar magazines