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EC number: 458-930-1 | CAS number: -
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Although Ceraphyl 55 reached a final mean percentage biodegradation of 65.8 %, this was after the test was extended to 60 days. Therefore, the substance cannot be considered to be readily biodegradable. However, extensive degradation was observed in a study lasting 60 days. This is indicative of the substance's propensity to be biodegradable. In addition modelling conducted using EPIWIN indicates that the substance biodegrades rapidly and was flagged as readily biodegradable. Therefore, analysis of all this data leads to the conclusion that this substance is at worst inherently biodegradable.
Key value for chemical safety assessment
- Biodegradation in water:
- inherently biodegradable
Additional information
The biodegradability of Ceraphyl 55 was determined in a GLP compliant, CO2 evolution study following OECD guideline 301B (Wildlife 2010). The study exposed activated sludge from a predominantly domestic sewage treatment plant to 10 mg C/L of Ceraphyl 55 for 60 days and the carbon dioxide evolved was measured. Blank, reference and toxicity controls were run alongside the test vessel. After 28 days, Ceraphyll 55 reached a mean 27.7% biodegradation. The study was extended to 60 days, and at the end of this period Ceraphyl 55 reached a final mean percentage biodegradation of 65.8 %. However, the criteria for ready biodegradation were not met, and therefore the substance cannot be considered to be readily biodegradable.
A half-life has not been stated by the authors of the study report (Wildlife 2010) but estimated from the available data. The average degradation of Ceraphyl 55 in the three replicates is 52.3 % after 39 days. This indicates that the half-life of Ceraphyl 55 would be expected to be less than 40 days under the test conditions.
This is supported by a GLP compliant, CO2 evolution study following OECD guideline 301B (Covance 2004). The study exposed activated sludge from a predominantly domestic sewage treatment plant to 15 mg C/L of Ceraphyl 55 for 28 days and the carbon dioxide evolved was measured. Blank, reference and toxicity controls were run alongside the test vessel. Ceraphyl 55 reached 37 % biodegradation after 28 days and therefore it is not considered to be readily biodegradable.
Extensive degradation was observed in the study lasting 60 days which is indicative of the substance's propensity to be biodegradable. In addition, modelling conducted using EPIWIN indicates that the substance biodegrades rapidly and was flagged as readily biodegradable. Analysis of all this data leads to the conclusion that this substance is at worst inherently biodegradable.
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