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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

 Readily biodegradable: ≥60% in 28 days

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable
Type of water:

Additional information

The ready biodegradability of the target substance was assessed in a weight of evidence approach based on the grouping of substances (category approach). The substances of the glycol esters category are assessed as readily biodegradable according to OECD criteria.

Moreover, two studies investigating the ready biodegradability of ethylene distearate (CAS 627-83-8) are available. The first study 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. 70% biodegradation and the fulfilment of the 10-day window criterion classify the substance to be readily biodegradable.