HR: 0830h
AN: B21B-0704    [PDF]
TI: Role of Water on the Fate of Organics in Reduced-Smectite Suspensions
AU: Stucki, J
EM: jstucki@uiuc.edu
AF: University of Illinois at Urbana-Champaign, Department of Natural Resources and Environmental Sciences College of Agricultural, Consumer, and Environmental Sciences University of Illinois, W-321 Turner Hall 1102 South Goodwin Avenue, Urbana, IL 61801 United States
AU: * Cervini-Silva, J
EM: javiera@eps.berkeley.edu
AF: University of California, Department of Earth and Planetary Science 151 Hilgard Hall #3110, Berkeley, CA 94720-3110 United States
AB: Clay mineral surfaces serve as a reaction site where interacting organic molecules undergo acid-base and redox transformations. Upon activation of the clay surface, water plays a key role in determining the mechanisms of transformation of adsorbing organics. The focus of this presentation will be on the reaction mechanisms of pesticides, and chlorinated and nitro aliphatics, at clay surfaces which have been modified through chemical or biological oxidation-reduction reactions. The outcome of this study indicates that the oxidation state of structural Fe in the clay strongly influences organic compounds hydration. A mechanism consistent with linear free energy relationships presented herein corresponds to organic compound hydration as the limiting step for adsorption and transformation by redox-manipulated smectites.
DE: 0330 Geochemical cycles
DE: 1045 Low-temperature geochemistry
DE: 4805 Biogeochemical cycles (1615)
DE: 4851 Oxidation/reduction reactions
SC: Biogeosciences [B]
MN: 2003 Fall Meeting