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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Non biodegradable

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

Additional information

According to OECD guideline 302B, no biodegradation of Direct Red 23 (DR23) based on CO2 evolution and calculated as % ThCO2 was observed in the Clariant key study (Clariant, 2007), where less than 20% degradation was attained after 28 days of contact time. This outcome was confirmed by the result of the second Clariant key study of 2002 (Clariant, 2002).