Abiotic reduction of organic contaminants by iron(II)-siderophore complexes

ENVR 198

Dongwook Kim, dkim37@uiuc.edu1, Timothy J. Strathmann, strthmnn@uiuc.edu1, and Owen Duckworth, owen_duckworth@ncsu.edu2. (1) Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, 4163 Newmark Civil Engineering Laboratory, 205 North Mathews Avenue, Urbana, IL 61801, (2) Department of Soil Science, North Carolina State University, PO Box 7619, Raleigh, NC 27695-7619
Desferrioxamine-B (DFOB) is a well known hydroxamate Fe(III) chelator excreted from microbes and plants. In this study, reactivity of aqueous Fe(II)–hydroxamate complexes, including DFOB, with several classes of organic pollutants including nitroaromatics, haloalkanes and N-heterocyclic nitramine is characterized using conventional and stop-flow techniques.

The Fe(II)-DFOB complex is autoxidized to Fe(III)-DFOB complex but non-stoichiometric reduction of nitroaromatics is also observed. The influence of pH, ligand structure and contaminant structure on reaction rates will be discussed.

 

Advances in Abiotic Transformation Processes for Micropollutants in Drinking Water and for Sourcewater Protection
1:30 PM-3:15 PM, Wednesday, April 9, 2008 Morial Convention Center -- Rm. 237, Oral

Division of Environmental Chemistry

The 235th ACS National Meeting, New Orleans, LA, April 6-10, 2008