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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Readily biodegradable: 73% (BOD) after 28 d (OECD 301C)

Key value for chemical safety assessment

Additional information

Two studies investigating the ready biodegradability of ethylene distearate (CAS 627-83-8) are available. The key study (Ministry of Economy, Trade and Industry, Japan, 1998) was conducted according to the OECD Guideline 301C (GLP) under aerobic conditions using a mixture of activated sludge from a municipal sewage treatment plant (STP), freshwater from rivers and lakes, marine water and marine sediment as inoculum. A mean biodegradation of 73% was observed after 28 d. Since the substance reached the pass level for OECD 301C (biodegradation is > 60% after 28 d, no 10-day window required) ethylene distearate is stated to be readily biodegradable according to the OECD criteria.

This result is supported by a second GLP-Guideline study according to OECD 301B using non-adapted activated sludge as inoculum (Mead, 1996). 70% biodegradation and the fulfilment of the 10-day window criterion classify the substance to be readily biodegradable.