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EXPOSURE ASSESSMENT MODELING FOR ALDICARB IN FLORIDA
Citation:
Dean, J. AND D. Atwood. EXPOSURE ASSESSMENT MODELING FOR ALDICARB IN FLORIDA. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/3-85/051 (NTIS PB87188801), 1987.
Description:
A modeling study was performed to assess aldicarb concentrations in drinking water wells in the vicinity of citrus groves in Florida. Areas in the citrus growing region were identified, with respect to the unsaturated and saturated zones, in which transport and transformation of aldicarb was thought to be different. In addition an extensive literature search was conducted to determine degradation rates and adsorption coefficients for aldicarb. These regional and chemical data were used to define various simulation scenarios. The fate and migration of aldicarb was then simulated for the unsaturated zone using the Pesticide Root Zone Model and for the unsaturated zone using the Combined Fluid-Energy-Solute Transport model. Results of the unsaturated zone modeling showed that the highest loads leached to ground water were approximately 1 kg/ha, occurring in areas of 'ridge' soils with thin unsaturated zones. Combined results of the unsaturated and saturated zone modeling showed that, in general concentrations in drinking water wells should be low but may exceed 10 ppb for aldicarb under some conditions.