Registration Dossier
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EC number: 701-092-1 | CAS number: 1175006-92-4
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
readily biodegradable, but failing 10-day window, CO2 Evolution (Modified Sturm) Test, OECD 301 B
Key value for chemical safety assessment
- Biodegradation in water:
- readily biodegradable but failing 10-day window
Additional information
In a 28-Day CO2 Evolution (Modified Sturm) Test, both Mexoryl SBO and its active content were found to be readily biodegradable, but failing the 10-day window according to EU Commission Regulation (EC) No 440/2008, C.4-C and OECD Guideline for Testing of Chemicals, No. 301 B (1992).
According to the Technical Guidance Document on Risk Assessment (2003), both Mexoryl SBO and its active content can be classified as readily biodegradable, but failing the 10-day window criterion. Mexoryl SBO (composed of 30.26% active content, 19.00% Dipropylene glycol and 45.60% water) was found to be biodegradable by 80% under the test conditions within the 28-day exposure period. So it exceeded the cut-off value for ready biodegradation (at least 60% within 28 days, but without fulfilling the 10-day window criterion. The CO2 formation of at least 60% of the TOC in the 10-day window within the 28-day period of the test was only marginally not reached.
The active content of Mexoryl SBO was found to be biodegradable by 75% under the test conditions within the 28-day exposure period. As for Mexoryl SBO, its active content exceeded the cut-off value for ready biodegradation without fulfilling the 10-day window criterion, this criterion being also only marginally not reached.
Mexoryl SBO had no inhibitory effect on the activity of activated sludge microorganisms at the tested concentration of 65.3 mg/L.
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