Abstract
A multimedia model and its parameters for describing the behavior of hydrophobic chemicals, such as POPs (Persistent Organic Pollutants), in a basin-scale environment were investigated. The amount of soil particles flowing into the river, which also controls the movement of chemicals from soil to the river, was determined so that the concentration of SS (Suspended Solid) calculated by a distributed hydrological model agreed with the observed values. The model was applied to the evaluation of environmental behavior of dioxins in Hyogo Prefecture and Biwako-Yodogawa basin. Since the environmental behavior and environmental concentration of dioxin obtained by the model are consistent with the observed values, the model and its parameters presented in this paper can be considered to be suitable for the prediction of the environmental behavior of such chemicals.
