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EC number: 272-574-2 | CAS number: 68890-66-4
Biodegradation in water and sediment: simulation tests
Administrative data
Link to relevant study record(s)
Description of key information
BIODEGRADATION IN WATER: SIMULATION TEST IN SEWAGE TREATMENT PLANT
In the followingTable 3a Mass balance is given for the Simulation test system based on daily sampling over 24d
| Effluent | Sludge | Total | Sorption to Glass& Tubing (estimated) | Remark | |
| 95% CI | 3.5 - 4.1 % | 85 - 95 % | 87 - 99 % | n.a. | analytical recovery forOctopirox was excellent |
| arithm. mean | 3.8 % | 90 % | 93 % | < 5% | Biodegradation is minor |
For the Sewage treatment modelling the mass balance was set to 4% release to effluent and 96% to sewage sludge.
BIODEGRADATION IN SEDIMENT
No data are available. Based on the aquatic Biodegradation data listed above rapid biotic degradation is not expected. As Octopirox is rapidly degraded by Direct photolysis in water this is the rate determining step for the fate and not biodegradation. Therefore a Sediment Simulation Test is not warranted.
Key value for chemical safety assessment
Additional information
SEDIMENT & SOIL BIODEGRADATION
Based on the data from the biodegradation tests in water rapid biodegradation is not expected in sediment and soil. As Direct photolysis in water is rapid this is the rate determining step in the fate of Octopirox in water a Sediment Simulation test is not warranted. Direct photolysis can also occur on soil surfaces and therefore a Soil Simulation test is not warranted.
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