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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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The performance of simulation tests for biodegradation in water and sediment is scientifically unjustified.
REACH Regulation (EC) No 1907/2006, Annex IX, Sect. 9.2.1.2, Col. 2, states as follows:
“9.2.1.2: The study need not to be conducted:
- if the substance is readily biodegradable, or
- if direct and indirect exposure of sediment is unlikely. ”
Direct and indirect exposure of the test item to sediment and water is unlikely. It can be assumed that upon contact with sediment and organic matter, the test item undergoes rapid degradation (hydrolysis) resulting in the formation of respective degradation products. Furthermore, the test item is not soluble in water and was considered to be inherently biodegradable. Therefore, simulation testing for biodegradation in sediment and water was considered not scientifically justified.

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