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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Readily biodegradable: 95 % (O2 consumption) after 28 d (OECD 301D) 

Key value for chemical safety assessment

Additional information

Data on the ready biodegradability of Stearic acid, monoester with glycerol (CAS 31566-31-1) are not available. Therefore, data on the ready biodegradability of a structurally related analogue substance (Glycerides, C14-18 mono- and di- (CAS 67701-33-1) is used as read-across in accordance with Regulation (EC) No. 1907/2006, Annex XI, 1.5. The biodegradability of Glycerides, C14-18 mono- and di- (CAS 67701-33-1) was tested in a study conducted according to OECD guideline 301D (Richterich, 1991). This test was conducted under GLP conditions. Activated sludge was exposed to the test substance for 28 days at 20°C, and biodegradation measured by O2consumption. After 28 days, the test substance reached 95% (2 mg/L test concentration) and 69% (5 mg/L test concentration) biodegradation. Based on the results for the read-across substance stearic acid, monoester with glycerol (CAS 31566-31-1) is considered as readily biodegradable. Furthermore a test on the anaerobic degradation of the substance is available (Birch, et al. 1989). The estimated biodegradation is based on the net DIC formation. The test substance was anaerobically biodegraded by 108 % when added as aqueous suspension.