The intention of the project is to verify whether simulation tests in the laboratory are suitable for extrapolation to degradation in surface water. The main aspect is the classification as persistent in the environment. Persistent substances can be transported over long distances in water courses and can be distributed over various environmental compartments.

Degradation half-life values derived in tests in accordance with ⁠OECD⁠ TG 308 (Aerobic and anaerobic Transformation in Water-Sediment systems) are compared to those values derived in OECD TG 309 tests (Aerobic Mineralisation in Surface Water). These data are integrated in a transport model for the River Rhine and compared to monitoring data in the field.