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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

No biodegradation oberved (OECD 301 F and OECD 302 B)

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

Additional information

The biodegradability of the test substance has been investigated in one ready and one inherent biodegradation study.

The ready biodegradation study was conducted according to OECD guideline 301 F and GLP (Feil, 2012). Non-adapted activated sludge, used as inoculum, was exposed to a loading of 104 mg/L test substance, corresponding to an oxygen demand of ca. 85 mg/L (COD). During the 28-day test period, no biodegradation occurred, based on oxygen consumption. The occurrence of nitrification was considered but not experimentally confirmed.

The inherent biodegradation study was conducted according to OECD guideline 302 B and GLP (Feil, 2012). Non-adapted activated sludge, used as inculum, was exposed to an initial test substance concentration of 50 mg DOC/L. During the 28-day test period no biodegradation occurred, based on DOC removal.

Hence, the test substance cannot be considered readily or inherently biodegradable.