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Figures, Tables, and Equations
Figure 1. Map of the MacArthur Agro-Ecology Research Center (MAERC) showing locations of three soil cores and locations of two pastures (S5, W4) where runoff water was collected.
Figure 2. Graphs showing concentrations of total phosphorus, nitrogen, sulfur, organic carbon, and uranium in soil profiles from improved pasture (S5), unimproved semi-native pasture (770), and native grassland (Lykes).
Figure 3. Graph showing variations of the U isotopic composition of soil extracts with depth in the three soil cores.
Figure 4. Graph showing the relation between organic carbon content of soil intervals and the percent of total U removed in a selective extraction with 0.1 M sodium bicarbonate.
Figure 5. Graphs showing the sulfur isotopic composition of soils from the three soil profiles with respect to (a) depth and (b) total S content.
Table I - Elemental analysis of soils and U isotopic analysis of soil extracts from selected intervals, MAERC
TABLE II - Uranium concentration and isotopic composition of phosphate-bearing fertilizers and cattle feed nutritional supplements used in the study area
TABLE III - Composition of runoff water from fertilized (S5) and unfertilized (W4) pastures
TABLE IV - Dissolved U concentration and U isotope composition of surface waters collected north and west of Lake Okeechobee
Equation 1. If an extract contains a mixture of desorbed natural U and fertilizer-derived U, then the mass contribution of U from each component can be calculated using this standard isotope mass balance equation
Equation 2. Equation 1 solved for mass fraction of natural uranium from fertilizer
U.S. Department of the Interior, U.S. Geological Survey
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