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(122) Fate modelling of organic chemicals in pond systems. Altschuh, Joachim1, Walcher, Sebastian1, Schramm, Karl-Werner2, 1 2 ABSTRACT- The determination of a chemical's fate in the environment is an important step in the process of hazard assessment. Deterministic mathematical models are suitable tools for predicting the environmental fate of chemicals. In this contribution we present a simple mathematical model that describes the distribution of organic chemicals in pond systems. Currently the model system includes the compartments water and sediment. The following processes are considered: transport (diffusion), sorption to sediment, inflow and degradation. The mathematical treatment of this system, which is a variant of well-known classical models, leads to a system of ordinary differential equations. We particularly focus on the classical problem of availability and uncertainty of model parameters, such as temperature or substance data, and look into the principal question of the meaningfulness of such models. We do this by calculating upper and lower estimates using a mathematical theory initiated by E. Kamke. Results of the model calculations will be compared to exposure measurements of nonylphenol in a pond microcosm. Key words: modelling, exposure, nonyphenol, pond microcosm |
