The FOCUS_TOXSWA model simulates exposure of the aquatic ecosystem in 10 FOCUS scenarios used in the registration procedure at EU level. A new feature of version 4.4.2 is the formation of metabolites in water and in sediment. Recently a proposal has been developed in cooperation between members of the FOCUS Version Control group on how to include the formation of metabolites in water in the 100 ha upstream catchment of the stream scenarios. The fraction of metabolite formed from the parent in the catchment is used as upper boundary for the stream. Calculation of the maximum fraction is based upon the DegT50 values of parent and of metabolite. Residence times of the parent in the upstream catchment, during which he metabolite is formed, are compared to the time needed to form this maximum fraction and next, the fraction that enters the stream is calculated. The maximum fraction of metabolite formed is shown to be independent of the water temperature in the scenario.

TOXSWA calculates metabolites entering FOCUS streams

248th National Meeting (2014)

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