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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Readily biodegradable: 82% after 28 days (OECD 301B)

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable

Additional information

One study investigating the ready biodegradability of Sodium methyl cocoyl taurate is available. The GLP study was conducted under aerobic conditions according to OECD guideline 301B using non-adapted, domestic activated sludge as inoculum (Lebertz, 2005). Based on CO2 evolution a mean degradation of 82% was observed after 28 days. According to “OECD Guidelines for the testing of chemicals – Revised introduction to the OECD guidelines for testing of chemicals, Section 3 – Part 1: Principles and strategies related to the testing of degradation of organic chemicals degradation” published by OECD (2006) the ready biodegradability data for mixtures should be evaluated carefully. For substances with different chain lengths the 10-day window should not be used for the interpretation of the results. It is possible that a sequential biodegradation occurred which might have led to a prolonged lag-Phase and therefore a slower biodegradation period. In this case the pass level can be applied at 28 days. Hence, the test substance is determined to be readily biodegradable according to OECD criteria.