projects > interactions of mercury with dissolved organic carbon in the everglades > project summary
Project Summary Sheet
Fiscal Year 2006 Study Summary Report
Study Title: Interactions of Mercury with Dissolved Organic Carbon in the Everglades
Overview & Objective(s):
Recent & Planned Products:
Haitzer, M., Aiken, G.R., Ryan, J.N., 2003, Binding of Mercury to Aquatic Humic Substances, Environmental Science and Technology, vol. 37, 2436-2441.
Drexel, E.T., Haitzer, M., Ryan, J.N., Aiken, G.R., Nagy, K., 2002, Mercury Sorption to two Florida Everglades Peats: Evidence for Strong and Weak Binding and Competition by Dissolved Organic Matter Released from Peat, Environmental Science and Technology, vol. 36, 4058-4064.
Haitzer, M., Aiken, G.R., Ryan, J.N., 2002, Binding of Mercury to Dissolved Organic Matter, Environmental Science and Technology, vol. 36, 3564-3570.
Aiken, G., Haitzer, M., Ryan, J.N., and Nagy, K., 2003, Interactions between dissolved organic matter and mercury in the Florida Everglades, J. du Physique, vol 107, 29-32.
Waples, J.S., Nagy, K.L., Aiken, G.R., and Ryan, J.N., 2005, Dissolution of cinnabar (HgS) in the presence of natural organic matter, Geochimica et Cosmochimica Acta, Vol. 69, 1575-1588.
Gasper, J., Aiken, G.R., and Ryan, J.N., 2006, A Critical Review of Three Methods Used for the Measurement of Mercury (Hg+2)-Dissolved Organic Matter Stability Constants, Applied Geochemistry, accepted for publication.
Planned: 4 journal articles in preparation
Relevance to Greater Everglades Restoration Information [Page numbers listed below are from the DOI Everglades Science Plan. The Science Plan is posted on SOFIA's Web site: http://sofia.usgs.gov/publications/reports/doi-science-plan/]:
This study supports the overarching goal, as outlined in the DOI science plan, of providing management information needs as they relate to water quality issues involving DOM, mercury and sulfur biogeochemistry. Specifically, our research supports several of the projects listed in the DOI science plan (Kissimmee-Okeechobee Watershed and Everglades Agricultural Area; Arthur R. Marshall Loxahatchee NWR Internal Canal Structures; Water Preservation Areas and Seepage Management; Everglades National Park, Biscayne Bay and Florida Keys; Landscape-Scale Science Needed to Support Multiple CERP Projects ) by (a) identifying factors controlling the concentration and reactivity of DOM, particularly in EAA, STAs, WCA-1, WCA-2 and WCA-3, (b) determining the effects of hydroperiod, hydrology and fire on DOM, (c) defining the interactions between DOM, sulfate and mercury on the bioavailability and transport of mercury.
The study supports the Kissimmee-Okeechobee Watershed and Everglades Agricultural Area project by providing data related to the quality waters, especially with regard to DOM, that may be injected as part of ASR (pg 27) and providing data that will be useful in monitoring and assessing the effects EAA reservoirs on the natural system (p 29).
The study supports the Arthur R. Marshall Loxahatchee NWR Internal Canal Structures project by studying the factors controlling water quality, especially with regard to DOM in the STAs that will ultimately deliver water to Loxahatchee NWR (p 39-40). In a similar way, the study supports Water Preservation Areas and Seepage Management projects by providing baseline water quality data for the STA's (p 44).
The study supports Everglades National Park, Biscayne Bay and Florida Keys projects by providing the fundamental research needed to understand the linkages between geologic, hydrologic chemical and microbial processes that control the transport and fate of DOM, control DOM interactions with mercury and ultimately control the bioreactivity and bioaccumulation of mercury (p 68). In addition, the study supports the C-111 canal project (p 71) and the Additional Water for Everglades National Park and Biscayne Bay Feasibility Study (p 74) by studying the factors controlling DOM generation and transport from EAA and STAs. This information assists with the need for assessments of water quality contaminants.
The study supports Landscape-Scale Science Needed to Support Multiple CERP Projects by studying the influences of STAs on water quality and the generation and transport of DOM in the STAs (p 85), by addressing the need to identify linkages between water quality and ecosystem structure and function (p 85) through research designed to elucidate the links between the carbon and sulfur cycles and mercury bioavailability. This research also supports the needs to understand the factors that control mercury methylation and bioaccumulation (p 89).
The study also indirectly supports Research into Potential Effects of Copper on Periphyton (p 89) by better defining the reactivity of DOM with metals and has implications for addressing water quality needs in Florida Bay (p 78) and identification of Threats Associated with ASR and In-Ground Reservoirs (p 87) by providing fundamental information of the roles played by DOM in the functioning of the Everglades ecosystem.
U.S. Department of the Interior, U.S. Geological Survey
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Last updated: 15 January, 2013 @ 12:43 PM(TJE)