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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Description of key information

Inherently biodegradable according to OECD criteria: 96% after 30 days based on DOC removal (OECD 303 A).

Key value for chemical safety assessment

Additional information

Since no reliable biodegradation tests are available for 16-18 and C18–unsatd. AS Na (CAS 1394155-71-5), in accordance to Regulation (EC) No. 1907/2006 Annex XI, 1.5 a read-across to another structurally related category member was conducted. Read-across data available for C16-18AS Na (CAS 68955-20-4) were used.

One reliable non-GLP simulation test with C16-18As Na (CAS 68955-20-4) according to OECD 303 A guideline is available (Richterich 2001). Adapted activated sludge from municipal sewage treatment plant was used as inoculum and the initial concentration of the test substance was 20 mg/L as DOC. The inoculum was adapted to synthetic waste water for one week. Biodegradation measured as DOC removal reached 96% after 30 days.

Due to structural and property similarities with the tested category member, it can be concluded that 16-18 and C18–unsatd. AS Na (CAS 1394155-71-5) is inherently biodegradable.