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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

The ready biodegradability of the test item 2,3-Epoxypropyl neodecanoate, oligomeric reaction products with toluene-4-sulfonic acid was determined with a non adapted activated sludge over a test period of 28 days in the Modified Sturm Test according to OECD 301 B. The test item was tested at a concentration of 25 mg/L in duplicates, corresponding to a carbon content (TOC) of 12.4 mg C/L in the test vessels. The biodegradation of the test item was followed by titrimetric analysis of the quantity of CO2 produced by the respiration of bacteria. The degradation was stopped on day 28 by acidification of the test solutions. The last titration was made on day 29, after residual CO2 had been purged from the test solutions over a period of 24 hours. The biodegradation was calculated for each titration time. 
The percentage degradation of the functional control reached the pass level of 60 % after 6 days and a biodegradation of 88 % after 28 days.
In the toxicity control containing both test and reference item a biodegradation rate of 44 % was determined within 14 days and it came to 53 % after 28 days.The biodegradation of the reference item was not inhibited by the test item in the toxicity control.
Both test item replicates reached the 10 % level (beginning of biodegradation) after 18 days and came to a biodegradation of 13 % and 20 %, respectively, after 28 days.

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

Additional information

The test item is classified as not readily biodegradable in the 10-d-window and after 28 days.