Registration Dossier
Registration Dossier
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EC number: 701-203-3 | CAS number: -
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Readily biodegradable: 61% after 28 d (ISO 14593:1999)
Key value for chemical safety assessment
- Biodegradation in water:
- readily biodegradable
Additional information
One study is available investigating the ready biodegradability of sorbitan monooleate, ethoxylated (1-6.5 moles ethoxylated) (CAS 9005-65-6). This study was performed according to ISO 14593:1999 using activated sludge from a sewage treatment plant treating predominantly domestic sewage (Burwood, 2005). The test substance was degraded to 61% after 28 d indicating that the substance is readily biodegradable. 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” published by OECD (2006) the ready biodegradability data for mixtures of structurally similar chemicals should be evaluated carefully. For substances with different chain lengths the 10-day window should not be used for the interpretation of results. It is possible that a sequential biodegradation occurred, which might have led to a prolonged lag-Phase and therefore a slower biodegradation period although the test substance was biodegraded in a large amount after the test duration. In this case the pass level can be applied at 28 days and the substance is therefore readily biodegradable (61% after 28 days). An additional toxicity control resulted in no inhibitory properties of the inoculum (131% after 28 d).
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