Level IV Fugacity Model by a continuous time control system

A continuous time dynamic control system of the 'Level IV Fugacity Model' i s presented and applied to selected organic chemicals in evaluative environ ments system. In order to illustrate the numerical solution by this model a discretization is used to calculate the fugacity, concentration and fugaci ty settling time for a set of three insecticides applied in a hypothetical three compartmental environmental system. The model employs the fugacity co ncept and treats three bulk compartments: air, water and bottom sediment. I nput to the model consists of a description of the environmental, the physi cal-chemical and reaction properties of the chemical, and emission rates. E xpressions in matrix form are included for emissions, advections, reactions , and inter-phase transference. An algorithm to determine the values of the fugacities, concentrations and fugacity settling time is given. (C) 1999 E lsevier Science Ltd. All rights reserved.