January 24, 2012
Journal Article

Biotic and Abiotic Reduction and Solubilization of Pu(IV)O2•xH2O(am) as Affected by Anthraquinone-2,6-disulfonate (AQDS) and Ethylenediaminetetraacetate (EDTA)

Abstract

In the presence of hydrogen (H2), the synthetic chelating agent ethylenediaminetetraacetate (EDTA), and the electron shuttle anthraquinone-2,6-disulfonate (AQDS), the dissimilatory metal-reducing bacteria (DMRB) Shewanella oneidensis and Geobacter sulfurreducens both reductively solubilized 100% of added 0.5 mM plutonium (IV) hydrous oxide (Pu(IV)O2•xH2O(am)) in ~24 h at pH 7 in a non-complexing buffer. In the absence of AQDS, bioreduction was much slower (~22 days) and less extensive (~83-94%). In the absence of DMRB but under comparable conditions, 89% (without AQDS) to 98% (with AQDS) of added 0.5 mM PuO2•xH2O(am) was reductively solubilized over 418 days. Under comparable conditions but in the absence of EDTA,

Revised: February 23, 2012 | Published: January 24, 2012

Citation

Plymale A.E., V.L. Bailey, J.K. Fredrickson, S.M. Heald, E.C. Buck, L. Shi, and Z. Wang, et al. 2012. Biotic and Abiotic Reduction and Solubilization of Pu(IV)O2•xH2O(am) as Affected by Anthraquinone-2,6-disulfonate (AQDS) and Ethylenediaminetetraacetate (EDTA). Environmental Science & Technology 46, no. 4:2132–2140. PNNL-SA-82367. doi:10.1021/es2030752