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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

According to a screening test to assess, the test substance is readily biodegradable (63% at Day 28; 10 day-window criterion waived).

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable

Additional information

Three screening tests assessing the biodegradability of the test substance are available. In the first one, the biodegradation reached 14% at Day 28 and 34% at Day 112 indicating lack of ready biodegradability. The lack of biodegradation is assumed to be related to lack of bioavailability due to the very low solubility of the substance in water. In the second and the third screening tests, experimental conditions were designed to improve the bioavailability of the substance using surfactants and/or silicon oil. Biodegradation values of 52% and 63% were obtained at day 28, respectively.

The substance being a complex substance, the 10-day window criterion is waived. Therefore, the pass level being applied at Day 28, the substance meets the ready biodegradable criterion (>60% at day 28) according to OECD guideline (301).