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EC number: 246-998-3 | CAS number: 25448-25-3
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
An OECD 301D Closed Bottle Test study was conducted on TDP. This study showed limited signs of biodegradation based on oxygen demand. However, the very low water solubility of TDP likely affected the test results and inhibited the bioavailability of the test material. A more recent OECD 301D Closed Bottle Test study was conducted on triisotridecyl (tris C13 isoalkyl phosphite) a close analogue to TDP. In this study, triisotridecyl phosphite was biodegraded by 57% at day 28 and 63% at day 42. Although triisotridecyl phosphite cannot be classified as readily biodegradable, the biodegradation reached at the last day of the test demonstrates that this substance is inherently biodegradable and not persistent.
TDP is subject to rapid hydrolysis (abiotic degradation), as such biological degradation is of greater relevance to the hydrolysis product - C10 alkyl alcohol or isodecanol. Tests indicate that the alkyl alcohol is readily biodegradable.
Key value for chemical safety assessment
- Biodegradation in water:
- readily biodegradable
Additional information
Due to the rapid hydrolysis and very low water solubility of triisodecyl phosphite this endpoint is best charaterized by evaluating the hydrolysis product, which in this case is the alkyl alcohol (C10) that is used to create the phosphite.
Test results show that the alkyl alcohol hydrolysis product is readily biodegradible.
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