110-1 Reactivity of Biogenic Manganese Oxides Associated with an Environmental Remediation System at a Superfund Site.

See more from this Division: SSSA Division: Soil Chemistry
See more from this Session: Microbial Mediated Processes for Contaminants and Minerals: I

Monday, November 16, 2015: 2:05 PM
Minneapolis Convention Center, M100 B

Owen W. Duckworth1, Megan Y. Andrews2, Terrence G. Gardner3, Edwin Mitchell4, Matthew L. Polizotto5, Nelson A Rivera6, Cara M. Santelli7 and Leslie A Sombers4, (1)PO Box 7619, North Carolina State University, Raleigh, NC
(2)Center for Integrated Fungal Research, North Carolina State University, Raleigh, NC
(3)Department of Soil Science, North Carolina State University, Raleigh, NC
(4)Chemistry, North Carolina State University, Raleigh, NC
(5)North Carolina State University, Raleigh, NC
(6)Duke University, Durham, NC
(7)Smithsonian Institution, Washington, DC
Abstract:
Environmental remediation of contaminated sites requires a detailed understanding of the biogeochemical processes occurring within remediation systems. In the Farm Lot 86 Superfund site (Raleigh, NC), dissolved manganese from influent groundwater is being microbially oxidized and precipitated, resulting in manganese oxide sludge formation in system components throughout the pump-and-treat system. To better understand manganese oxide formation, we conducted a multipronged spectroscopic and microbiolocial investigation of the sludge, which revealed the presence of layer type Mn(IV) oxides containing significant concentrations of cobalt(III), zinc(II), and barium(II) adsorbed to specific crystallographic sites. Efforts to isolate manganese oxidizing organisms resulted in isolation of phylogenetically diverse array of fungi. These organism produce layer-type Mn(IV) oxides that have structural characteristics, including association with organic matter and quamtity of crystallographic vacancies, that distinguish them from other Mn oxides and affect their sorption and redox reactivity. Electrochemical investigations of these mycogenic oxides reveal relationships between the incorporation of metals, mineral structure, and the redox reactivity.

See more from this Division: SSSA Division: Soil Chemistry
See more from this Session: Microbial Mediated Processes for Contaminants and Minerals: I

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