Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.h41e0928j&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #H41E-0928
Physics
0432 Contaminant And Organic Biogeochemistry (0792), 1065 Major And Trace Element Geochemistry
Scientific paper
Wildfires are a common occurrence in the Mediterranean climate of Southern California. Many studies have focused on the post-fire physical impacts however; there is a lack of studies on the potential for post-fire metal transport, in particular mercury (Hg). Inorganic Hg contamination is present even in pristine areas due to atmospheric deposition, which can be microbially transformed to methylmercury (a bioaccumulative neurotoxin) in aquatic systems. In order to model the transport of mercury in burned soils, we need to understand the sorption properties of mercury in soils exposed to fire. To test the hypothesis that burned soils have different sorption properties than unburned ones, we have collected samples of unburned soils, and burned them in a controlled setting at different temperatures to simulate several fire intensities. Then, we applied traditional aqueous sorption techniques to determine the binding properties of mercury to each burned soil. Experimental data were fitted with FITEQL to derive constants for sorption reactions, which were in agreement with values observed in literature. Since Southern California does not receive much rain, most of the atmospheric mercury deposition is in form of dry deposition. Thus, we have designed and applied a novel sorption technique to determine the binding of mercury in the gas phase to the burned soils. Trends in sorption affinity and capacity with burning temperature are discussed, as well as a comparison between aqueous and gas phase sorption properties is made.
Burke Martin
Ferreira Marta
Hogue Terri
Jay Jenny
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