Abstract
For assessing the potential hazard of the chemicals to human and other organisms, it is required to evaluate ambient concentrations of the chemicals in air, water, and soil media. Mathematical models have been developed and used for estimating the fate and concentrations of chemicals released into the environment. The principal approaches of the models are based on the mass balance equations expressed in terms of ; ·load into the environment, ·equilibrium and rate constants for transport, transfer, and transformation processes, ·environmental conditions. They are classified into three types of modelling approaches ; ·partition equilibrium model, ·simplified fate simulation model, ·detailed fate simulation model. It may be possible to estimate the amount of the chemicals exposed to human and environmental organisms, based on the model outputs, combined with environmental monitoring data.
