PMID: 18409624Apr 16, 2008Paper

Formation of aqueous MgUO2(CO3)3(2-) complex and uranium anion exchange mechanism onto an exchange resin

Environmental Science & Technology
Wenming Dong, Scott C Brooks

Abstract

The formation of and stability constants for aqueous Mg-UO2-CO3 complexes were determined using an anion exchange method. Magnesium concentration was varied (up to 20 mmol/L) at constant ionic strength (I = 0.101, 0.202, 0.304, 0.406, and 0.509 mol/kg NaNO3), pH 8.1, total [U(VI)] = 10.4 micromol/L under equilibrium with atmospheric CO2. The results indicate that only the MgUO2(CO3)3(2-) complex is formed. The cumulative formation constant extrapolated to zero ionic strength is similar regardless of the activity correction convention used: logbeta113(0) = 25.8 +/- 0.5 using the Davies equation and = 25.02 +/- 0.08 using specific ion interaction theory (SIT). Uranium sorption onto the exchange resin decreased in the presence of Mg putatively due to the formation of MgUO2(CO3)3(2-) that had a lower affinity for the resin than UO2(CO3)3(4-). Uranium sorption results are consistent with an equivalent anion exchange reaction between NO3- and UO2(CO3)3(4-) species to retain charge neutrality regardless of Mg concentration. No Mg was associated with the anion exchange resin indicating that the MgUO2(CO3)3(2-) complex did not sorb.

References

Sep 1, 1980·Analytical Biochemistry·P J Munson, D Rodbard
Sep 1, 1986·Environmental Science & Technology·D G Kinniburgh

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Citations

Feb 2, 2013·Chemical Reviews·Marcus AltmaierThomas Fanghänel
Feb 7, 2012·Environmental Science & Technology·José M CerratoDaniel E Giammar
Jun 28, 2012·Environmental Science & Technology·Tetsu K TokunagaLi Yang
Sep 18, 2012·Water Research·Daniel E GiammarJohn R Bargar
Jul 8, 2016·Environmental Science & Technology·Marie-Noële CroteauGeorge Aiken
Mar 30, 2017·Environmental Science. Processes & Impacts·Johanna M BlakeJosé M Cerrato
Nov 23, 2016·Proceedings of the National Academy of Sciences of the United States of America·Eduardo ParedesCarole Bresson
Sep 25, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Yongheum JoJong-Il Yun
Aug 12, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Yongheum JoJong-Il Yun
Nov 4, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Chengming ShangThomas Vercouter
Nov 15, 2020·The Science of the Total Environment·Patrick ByrneWilliam L Dam
Oct 24, 2009·Environmental Science & Technology·Peter S NicoScott Fendorf
May 22, 2021·Journal of Environmental Radioactivity·Laureline FévrierMichel Meyer
Mar 17, 2020·Environmental Science & Technology·Jorge Gonzalez-EstrellaJosé M Cerrato
Nov 16, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Chengming Shang, Pascal E Reiller

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