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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Readily biodegradable: key study 79.5% and 70.8% (CO2 evolution) biodegradation in replicates 1 and 2 by day 15, 10-day window met (OECD TG 301B)

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable

Additional information

Two ready biodegradability tests are available for Ethylhexyl diphenyl phosphate, carried our according to OECD TG 301B (CO2 -evolution, Tunink, 2009) and OECD TG 301D with small deviations (Closed Bottle, Van Ginkel, 2010). Both studies have reliability 1, therefore the study which revealed the highest % biodegradation was chosen as the key study. In the key study (Tunink, 2009) the test substance systems yielded CO2 values of 79.5% and 70.8% for replicates 1 and 2, respectively, by Day 15 of the study. Since the biodegradation values of replicate 1 and replicate 2 were greater than 60% ThCO2 within a 10-day window of reaching 10% ThCO2, these results indicate that the composition of the test substance is readily biodegradable. This result is supported by a result of 65% biodegradation at day 28 (meeting the 10 -day window) in the supporting study (Van Ginkel, 2010).