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Spatial Distribution of DDT in Sediments from Estuarine Rivers of Central Florida

^a Department of Water Resources, St. Johns River Water Management District, P.O. Box 1429, Palatka, FL 32178-1429
^b Department of Information Resources, St. Johns River Water Management District, P.O. Box 1429, Palatka, FL 32178-1429
^c Soil and Water Science Department, University of Florida, Gainesville, FL 32611-0290

View larger version (81K): [in a new window]   Fig. 1. Location of the study area showing the watershed of the Cedar and Ortega Rivers.

View larger version (13K): [in a new window]   Fig. 2. Histogram of DDT data (a) before and (b) after transformation.

View larger version (18K): [in a new window]   Fig. 3. Experimental variograms in the x (D1) and y directions (D2).

View larger version (41K): [in a new window]   Fig. 4. Variogram maps of natural log-transformed DDT data.

View larger version (23K): [in a new window]   Fig. 5. Comparison of experimental variogram and variogram model.

View larger version (27K): [in a new window]   Fig. 6. Relationship between the cross-validation standardized error and the estimated ln DDT concentration.

View larger version (46K): [in a new window]   Fig. 7. Spatial distribution of kriged DDT concentrations at sediment depths of 0.1, 0.5, 1.0, and 1.5 m.

View larger version (63K): [in a new window]   Fig. 8. Three-dimensional view of kriged DDT distribution in the Cedar and Ortega Rivers.

View larger version (27K): [in a new window]   Fig. 9. The DDT to total organic carbon (TOC) ratio as a function of distance in the x direction.

View larger version (58K): [in a new window]   Fig. 10. Three-dimensional view of kriged DDT distribution in the Cedar and Ortega Rivers. The dark black color represents the DDT concentrations exceeding the probable effect level (PEL) value (4.78 mg kg-1).

View larger version (22K): [in a new window]   Fig. 11. Relationships among DDT species.