Postdoctoral Scholar, Division of Ecosystem Sciences
University of California, Berkeley, California
Ph.D., Engineering and Applied Sciences
Harvard University
M.S., Environmental Sciences and Engineering
University of North Carolina, Chapel Hill
B.S., Chemistry and Geology, cum laude
College of William and Mary
The activity of microbes greatly affects the biogeochemical flow of nutrients and contaminants in the environment. Our reserach primarily focuses on the thermodynamics and kinetics of aqueous and interfacial reactions involving biogenic exudates that contribute to understanding the biogeochemical cycling of natural and anthropogenic species. We blend traditional wet-chemical, field, and microbiological methods with modern spectroscopic, microscopic, molecular biology, and theoretical techniques to obtain an understanding of mechanisms and reaction pathways on molecular to macroscopic scales.
Soil Chemsitry (SSC 521), Spring 2008
Special Topics: Soil and Environmental Biogeochmeistry (SSC 495B), Spring 2009
Duckworth, O.W., Bargar, J.R., and Sposito, G. (2008) Quantitative-Structure Activity Relationships for Aqueous Metal-Siderophore Complexes, submitted.
Kim, D., Duckworth, O.W., and Strathmann, T.J. (2008) Hydroxamate Siderophore-Promoted Reduction of Nitroaromatic Contaminants by Iron(II), submitted.
Duckworth, O.W., Bargar, J.R., Jarzecki, A.A., Oyerinde, O., Spiro, T.G., and Sposito, G. (2008) The Exceptionally Stable Cobalt(III)–Desferrioxamine B Complex, submitted.
Duckworth, O.W., Holmström, S.J.M., Peña, J., and Sposito, G. (2008) Biogeochemistry of Iron Oxidation in a Circumneutral Freshwater Habitat, Chemical Geology, in press.
Duckworth, O.W., Bargar, J.R., and Sposito, G.(2008) Sorption of Ferric Iron from Ferrioxamine B to Synthetic and Biogenic Layer Type Manganese Oxides, Geochimica et Cosmochimica Acta, 72, 3371-3380.
Peña, J., Duckworth, O.W., Bargar, J.R., and Sposito, G. (2007) Dissolution of Hausmannite in the Presence of the Trihydroxamate Siderophore Desferrioxamine B, Geochimica et Cosmochimica Acta, 71, 5661-5671.
Duckworth, O.W., and Sposito, G. (2007) Siderophore-Promoted Dissolution of Synthetic and Biogenic Layer Type Mn Oxides, Chemical Geology, 242, 202-213.
Duckworth, O.W., and Sposito, G. (2005) Siderophore-Manganese(III) Interactions I. Air-Oxidation of Manganese(II) Promoted by Desferrioxamine B, Environmental Science and Technology, 39, 6037-6044.
Duckworth, O.W., and Sposito, G. (2005) Siderophore-Manganese(III) Interactions II. Manganite Dissolution Promoted by Desferrioxamine B, Environmental Science and Technology, 39, 6045-6051.
Perry, T.D., Duckworth, O.W., Kendall, T.K., Martin, S.T., and Mitchell, R. (2005) Chelating ligand Alters the Microscopic Mechanism of Mineral Dissolution, Journal of the American Chemical Society, 127, 5744-5745.
Perry, T.D., Duckworth, O.W., McNamara, C.J., Martin, S.T., and Mitchell, R. (2004) The Effects of the Biologically Produced Polymer Alginic Acid on Macroscopic and Microscopic Calcite Dissolution Rates, Environmental Science and Technology, 38, 3040-3046.
Duckworth, O.W., Cygan, R.T., and Martin, S.T. (2004) Linear Free Energy Relationships between Dissolution Rates and Molecular Modeling Energies of Rhombohedral Carbonates. Langmuir, 20, 2938-2946.
Duckworth, O.W., and Martin, S.T. (2004) Dissolution Rates and Pit Morphologies of Rhombohedral Carbonate Minerals. American Mineralogist, 89, 554-563.
Duckworth, O.W., and Martin, S.T. (2004) Role of Molecular Oxygen in the Dissolution of Siderite and Rhodochrosite. Geochimica et Cosmochimica Acta, 68, 607-621.
Duckworth, O.W., and Martin, S.T. (2003) Connections between Surface Complexation and Geometric Models of Mineral Dissolution Investigated for Rhodochrosite. Geochimica et Cosmochimica Acta, 67, 1787-1801.
Duckworth, O.W., and Martin, S.T. (2001) Surface Complexation and Dissolution of Hematite by C1-C6 Dicarboxylic Acids at pH = 5.0. Geochimica et Cosmochimica Acta, 65, 4289-4301.
Martin, S.T., Schlenker, J., Chelf, J.H., and Duckworth, O.W. (2001) Structure-Activity Relationships of Mineral Dusts as Heterogeneous Nuclei for Ammonium Sulfate Crystallization from Supersaturated Aqueous Solutions. Environmental Science and Technology, 35, 1624-1629.
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