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OF THE THESIS AREAL AND VERTICAL DISTRIBUTION OF TOTAL SOIL-MERCURY AND TOTAL PHOSPHORUS IN THE SOUTHERN HALF OF WATER CONSERVATION AREA 3A, EVERGLADES, SOUTHERN FLORIDA by Cleone Botelho Arfstrom Florida International University, 1995 Dr. Andrew Macfarlane, Major Professor Total soil-mercury and phosphorus concentrations were determined in 64 sites in the southern half of Water Conservation Area 3A, an area of approximately 500 km 2 . Surface soil-Hg concentrations ranged from 117 to 300 ng-g-1; total phosphorus concentrations range from 350 to 850 pg~g-1. No consistent north-south or east-west trends are found in the mercury or phosphorus surface concentrations when they are normalized to soil bulk density. Nine sites were used for the determination of the vertical distribution of soilmercury. Vertical profiles of soil-Hg revealed decreasing concentrations with depth and correlated well with phosphorus in soil profiles. Mercury concentrations in soil profiles may be interpreted as an increase in the rate of deposition of mercury in the region in recent decades and/or as postdepositional mobilization of mercury to surface layers.

Areal and vertical distribution of total soil mercury and total phosphorusin the southern half of water conservation area 3-A, Everglades, Southern Florida