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EC number: 205-535-5 | CAS number: 142-31-4
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Readily biodegradable according to OECD criteria: 93.5% after 29 days based on CO2 evolution (OECD 301 B).
Key value for chemical safety assessment
- Biodegradation in water:
- readily biodegradable
Additional information
Four studies on biodegradation in water are available for C8AS Na (CAS 142-31-4). The key study was performed according to OECD guideline 301 B and GLP (Neven 1994). Activated, domestic, non-adapted sludge from predominantly municipal STP was used as inoculum. The initial concentration was 10 mg C/L expressed as DOC. CO2 evolution was measured for 29 days. Biodegradation reached 93.5% after 29 days and 80% after 10 days passing the 10-day window. It can be concluded that C8AS Na (CAS 142-31-4) is readily biodegradable according to OECD criteria. The supporting GLP study was performed according to 301 D guideline (Marks 1991). Non-adapted effluent of a SCAS unit was used as inoculum and the initial concentrations of the test substance were 2 mg/L and 5 mg/L. Biodegradation measured as O2 consumption reached 98% after 28 days at the concentration 2 mg/L and above 72% at the concentration of 5 mg/L. The 10-day window was passed (more than 68% biodegradation after day 5). Another, non-GLP supporting study was performed according to OECD 301 D guideline (Richterich and Mühlberg 2001). Effluent of a municipal sewage treatment plant was used as inoculum and the initial concentrations of the test substance were 2 mg/L and 5 mg/L. Biodegradation measured as O2 consumption reached 91% and 94% after 28 days, respectively. The 10-day window was passed in both cases (more than 80% biodegradation at day 10). The last non-GLP study (Sanchez Leal 1991) was performed according to OECD 301 E guideline. Biodegradation reached ca. 100% after 8 days.
Based on the presented data it can be concluded that C8AS Na (CAS 142-31-4) is readily biodegradable according to OECD criteria.
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