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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Description of key information

In an OECD 308 study, conducted according to GLP, the test material dissipated rapidly from the water of both aquatic sediment systems, with DT50 values of 2.6 days (Calwich Abbey Lake) and 10.4 days (Emperor Lake).  The DT50 value in the sediment phase of Calwich Abbey Lake was 811 days, based on two sampling intervals.  The DT50 value for the decline in the sediment phase of Emperor Lake could not be calculated, as the test material (as % applied parent) continued to increase until the last sampling interval.  Decline in the overall aquatic sediment system was slow and corresponded to DT50 values of 657 days (Calwich Abbey Lake) and 636 days (Emperor Lake). Mostly parent compound was detected in the water organic extracts and sediment extracts throughout the study (mineralization to CO2 ≤5.6% applied radioactivity), with only minor amounts of unidentified polar material (up to 5.6% applied radioactivity at time zero).

Key value for chemical safety assessment

Half-life in freshwater:
2.6 d
at the temperature of:
12 °C
Half-life in freshwater sediment:
811 d
at the temperature of:
12 °C

Additional information

Due to the low solubility of the test material and rapid partitioning from the aqueous phase to the sediment, aerobic mineralisation in surface water – simulation biodegradation testing according to OECD Testing Guideline No. 309 is considered technically not feasible.