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EC number: 294-600-1 | CAS number: 91744-38-6
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
The test substance (CAS 91744-38-6, Glycerides, C16-18 mono-, di- and tri-, hydrogenated, citrates, potassium salts) is readily biodegradable.
Key value for chemical safety assessment
- Biodegradation in water:
- readily biodegradable
Additional information
The test substance (CAS 91744-38-6, Glycerides, C16-18 mono-, di- and tri-, hydrogenated, citrates, potassium salts) was tested for ready biodegradability according to OECD Guideline 301D (Closed Bottle Test) under GLP following the O2 consumption over a period of 28 days. The substances was tested at an initial concentration of >4 - < 5 mg/L COD. Effluent of a domestic sewage plant was used as inoculum and benzoic acid, sodium salt served as reference substance. Oxygen measurements were performed at Days 0, 7, 14, 21, and 28. Benzoic acid, sodium salt was degraded to 76 % after 28 d whereas 68 % degradation could be observed for the test substance. The test substance was evaluated to be readily biodegradable; however, the 10 -day-window criterion was not met.
According to the "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" ready biodegradability tests are intended for pure chemicals. "It is sometimes relevant to examine the ready biodegradability of mixtures of structurally similar chemicals like oils and surface-active substances (surfactants). As a sequential biodegradation of the individual structures is anticipated, the 10-day window should not be applied to interpret the results of test with mixtures of structurally related chemicals. "Therefore, the 10-day window does not apply for the UVCB "Glycerides, C16-18 mono-, di- and tri-, hydrogenated, citrates, potassium salts".
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