A MODEL APPROACH TO STUDYING ENVIRONMENTALLY PERSISTENT FREE RADICALS (EPFRs) IN SUPERFUND SOILS
Previous work in our Superfund Center demonstrated elevated concentrations of environmentally persistent free radicals (EPFRs) in the soils of a number of Superfund sites across the United States of America, but not in adjacent soils. Analysis of these Superfund soils has revealed that the EPFRs are associated with the clay/humin fraction of the soils. One of the main questions borne out from these findings is “how are radicals formed in polluted soils at environmentally relevant temperatures?” In order to address this question, we have broken the potential EPFR-forming components in soil into three components, namely: mineral, organic, and biological. For the work reported here, the mineral, organic, and biological components under consideration are redox center loaded Ca-montmorillonite clay, model organic systems echoing moieties found in humic materials, and white rot fungi enzymes, respectively. This talk presents the approach we are taking in order to gain insights into how radicals can be formed by monitoring the sorption of EPFR parent pollutants, the formation of radicals, and changes within the soil components during these processes.
Robert L. , Cook ( presenting )
Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803
Ugwumsinachi G. , Nwosu
Albert Leo N., dela Cruz
Contribution proposed for: oral presentation