Registration Dossier
Registration Dossier
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EC number: 261-818-3 | CAS number: 59587-38-1
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Based on an analogous chemical with a maximum mean degradation of 42% after 28 days, the test substance is not expected to be readily biodegradable.
Key value for chemical safety assessment
Additional information
No biodegradation study with the test substance is available. An OECD Guideline 301B study with polyfluorosulphonic acid was used as a read across to fulfill the data gap for the test substance. Additional documentation, provided within the IUCLID Assessment Reports section, supports the read-across approach.
The study was conducted to evaluate biodegradability of the test substance using a modified Strum test with a non adapted activated sludge over a test period of 28 days according to OECD Guideline 301B. The test substance was tested with a concentration of 150 mg/L in duplicates, corresponding to a carbon content (TOC) of 10.1 mg C/L in the test vessels. The biodegradation of the test substance was followed by titrimetric analyses of the quantity of CO2 produced by the respiration of bacteria. The degradation was finished on day 28 by acidification, the last titration was made on day 29, after the soluble CO2 was turned out over a period of 24 hours. The percentage CO2 production was calculated in relation to the theoretical CO2 (ThCO2) of the test item. The biodegradation was calculated for each titration time. The pass level of 60% was not reached, neither in the 10-day window nor after 28 days. The mean biodegradation came to a maximum of 42% after 28 days; therefore, the test substance is not considered readily biodegradable.
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