Registration Dossier
Registration Dossier
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EC number: 278-758-9 | CAS number: 77745-66-5
Endpoint summary
Administrative data
Description of key information
The environmental fate properties of the triisotridecyl phosphite (TiTDP) and related alkyl phosphites generally include: low water solubility, low vapour pressure, and rapid hydrolysis to phosphorous acid and corresponding alcohols (in the case of TiTDP it is isotridecanol (C13 alkyl alcohol)).
In fugacity Level III modelling with equal emissions to all three compartments, the vast majority of the TiTDP partitioned to the soil. Actual emissions to air, water, and soil are vastly overstated in the model and expected to be very low based on actual uses.
A biodegradation screening study, OECD 301D Closed Bottle Test, was performed by van Ginkel (2014) on TiTDP to evaluate the persistence of TiTDP and also to compare the rate of biodegradation of TiTDP to that of its primary hydrolysis product – isotridecyl alcohol. The results of the new OECD 301D study found 57% degradation at 28 days, with degradation continuing to 63% degradation at 42 days. Whilst these results do not fully meet the ready biodegradable standard, they demonstrate that TiTDP is inherently biodegradable and not persistent. The rate of biodegradation of TiTDP is somewhat slower than that of isotridecyl alcohol, which does meet the ready criterion. This is probably due to the additional time needed for hydrolysis to occur and also for the greater sorption potential of the phosphite vs. the alcohol, which can also delay the biodegradation process.
Bioaccumulation concentration factor (BCF) estimates for TiTDP are all very low even without considering hydrolysis or biotranformation of the substance, both of which are expected to be high. BCF values from on the BCFBAF v3.00 model are in the range of <1 to 3.1 L/kg, well below the criterion of B (2000 L/kg) or vB (5000 L/kg).
Additional information
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