Simulation of long-term environmental dynamics of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans using the dynamic multimedia environmental fate model and its implication to the time trend analysis of dioxins

Long term environmental fate of polychlorinated dibenzo-p-dioxins (PCDD) an d polychlorinated dibenzofurans (PCDF) were studied using the fugacity-base d dynamic multimedia environmental fate model. New formulation about soil w ind erosion into air was included into the model. Effect of process assumpt ion, sensitivity analysis for parameters, and tentative validation against the measured sediment core analysis was performed. Mass fluxes between comp artments were estimated by the dynamic modeling. From the model estimates, major mass fluxes coming from emission source were shown to go to the soil and water through wet/dry deposition, then go to degradation mainly in the soil and sediment. Major mass fluxes of TCDD and OCDD come from the impurit ies in CNP (Chlornitrofen) and PCP (Pentachlorophenol) directly into the so il. Consideration about multimedia environmental dynamics using the modeled mass fluxes was shown in the discussion. (C) 2000 Elsevier Science Ltd. Al l rights reserved.