Sorption and bioreduction of hexavalent uranium at a military facility by the Chesapeake Bay

Wenming Dong, Guibo Xie, Todd R. Miller, Mark P. Franklin, Tanya Palmateer Oxenberg, Edward J. Bouwer, William P. Ball, Rolf Halden

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Directly adjacent to the Chesapeake Bay lies the Aberdeen Proving Ground, a U.S. Army facility where testing of armor-piercing ammunitions has resulted in the deposition of >70,000 kg of depleted uranium (DU) to local soils and sediments. Results of previous environmental monitoring suggested limited mobilization in the impact area and no transport of DU into the nation's largest estuary. To determine if physical and biological reactions constitute mechanisms involved in limiting contaminant transport, the sorption and biotransformation behavior of the radionuclide was studied using geochemical modeling and laboratory microcosms (500 ppb U(VI) initially). An immediate decline in dissolved U(VI) concentrations was observed under both sterile and non-sterile conditions due to rapid association of U(VI) with natural organic matter in the sediment. Reduction of U(VI) to U(IV) occurred only in non-sterile microcosms. In the non-sterile samples, intrinsic bioreduction of uranium involved bacteria of the order Clostridiales and was only moderately enhanced by the addition of acetate (41% vs. 56% in 121 days). Overall, this study demonstrates that the migration of depleted uranium from the APG site into the Chesapeake Bay may be limited by a combination of processes that include rapid sorption of U(VI) species to natural organic matter, followed by slow, intrinsic bioreduction to U(IV).

Original languageEnglish (US)
Pages (from-to)132-142
Number of pages11
JournalEnvironmental Pollution
Volume142
Issue number1
DOIs
StatePublished - Jul 2006
Externally publishedYes

Fingerprint

Military Facilities
Uranium
Sorption
uranium
sorption
microcosm
Biological materials
Sediments
Ammunition
organic matter
Estuaries
Piercing
Armor
Environmental Monitoring
biotransformation
pollutant transport
Biotransformation
environmental monitoring
Radioisotopes
sediment

Keywords

  • Bioreduction
  • Humic substances
  • Natural organic matter
  • Sorption
  • Uranium

ASJC Scopus subject areas

  • Environmental Chemistry
  • Environmental Science(all)
  • Pollution

Cite this

Sorption and bioreduction of hexavalent uranium at a military facility by the Chesapeake Bay. / Dong, Wenming; Xie, Guibo; Miller, Todd R.; Franklin, Mark P.; Oxenberg, Tanya Palmateer; Bouwer, Edward J.; Ball, William P.; Halden, Rolf.

In: Environmental Pollution, Vol. 142, No. 1, 07.2006, p. 132-142.

Research output: Contribution to journalArticle

Dong, W, Xie, G, Miller, TR, Franklin, MP, Oxenberg, TP, Bouwer, EJ, Ball, WP & Halden, R 2006, 'Sorption and bioreduction of hexavalent uranium at a military facility by the Chesapeake Bay', Environmental Pollution, vol. 142, no. 1, pp. 132-142. https://doi.org/10.1016/j.envpol.2005.09.008
Dong, Wenming ; Xie, Guibo ; Miller, Todd R. ; Franklin, Mark P. ; Oxenberg, Tanya Palmateer ; Bouwer, Edward J. ; Ball, William P. ; Halden, Rolf. / Sorption and bioreduction of hexavalent uranium at a military facility by the Chesapeake Bay. In: Environmental Pollution. 2006 ; Vol. 142, No. 1. pp. 132-142.
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