title: Legacy and fate of mercury and methylmercury in the Florida Everglades.
abstract: Mass inventories of total Hg (THg) and methylmercury (MeHg) and mass budgets of Hg newly deposited during the 2005 dry and wet seasons were constructed for the Everglades. As a sink for Hg, the Everglades has accumulated 914, 1138, 4931, and 7602 kg of legacy THg in its 4 management units, namely Water Conservation Area (WCA) 1, 2, 3, and the Everglades National Park (ENP), respectively, with most Hg being stored in soil. The current annual Hg inputs account only for 1-2% of the legacy Hg. Mercury transport across management units during a season amounts to 1% or less of Hg storage, except for WCA 2 where inflow inputs can contribute 4% of total MeHg storage. Mass budget suggests distinct spatiality for cycling of seasonally deposited Hg, with significantly lower THg fluxes entering water and floc in ENP than in the WCAs. Floc in WCAs can retain a considerable fraction (around 16%) of MeHg produced from the newly deposited Hg during the wet season. This work is important for evaluating the magnitude of legacy Hg contamination and for predicting the fate of new Hg in the Everglades, and provides a methodological example for large-scale studies on Hg cycling in wetlands.
authors.affiliation: Department of Chemistry & Biochemistry, Florida International University, Miami, Florida 33199, USA.
authors.forename: Guangliang
authors.initials: G
authors.lastname: Liu
authors.forename: G Melodie
authors.initials: GM
authors.lastname: Naja
authors.forename: Peter
authors.initials: P
authors.lastname: Kalla
authors.forename: Dan
authors.initials: D
authors.lastname: Scheidt
authors.forename: Evelyn
authors.initials: E
authors.lastname: Gaiser
authors.forename: Yong
authors.initials: Y
authors.lastname: Cai
mesh_terms: D000393:Air Pollutants / Q000032:analysis; D017753:Ecosystem; D004784:Environmental Monitoring; D005431:Florida; D005618:Fresh Water / Q000737:chemistry; D008628:Mercury / Q000032:analysis*; D008767:Methylmercury Compounds / Q000032:analysis*; D012621:Seasons; D012987:Soil / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*; D053833:Wetlands
chemical_list: D000393:Air Pollutants; D008767:Methylmercury Compounds; D012987:Soil; D014874:Water Pollutants, Chemical; D008628:Mercury