Currently available models for the prediction of the environmental fate of chemicals were developed mainly for organic compounds with simple molecular structures. Furthermore, most of the underlying experimental data were generated in qualitative form (e.g. ready vs. not ready biodegradable) and available data sets are typically related to water-only systems and not to sediments, where sorption, ageing, sequestration and cross coupling may affect bioavailability, transformation and degradation. Hence, there is need for reliable, quantitative biodegradation data for more complex environmental matrices.
A water-sediment screening tool (WSST) was developed based on the OECD Guideline 301C (MITI) to generate biodegradation data. The developed WSST is the first water-sediment test system on screening test level.