Registration Dossier
Registration Dossier
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EC number: 246-998-3 | CAS number: 25448-25-3
Endpoint summary
Administrative data
Description of key information
Additional information
The environmental fate properties of the trisisodecyl phosphite (TiDP) and related alkyl phosphites generally include: low water solubility, low vapor pressure, and rapid hydrolysis to phosphorous acid and corresponding alcohols (in the case of TiDP it is isodecanol (C10 alkyl alcohol)).
In fugacity Level III modeling with equal emissions to all three compartments, the vast majority of the TiDP partitioned to the soil. With emissions to just air or soil, the majority of the releases partitions to the soil compartment.
These phosphite substances have demonstrated limited potential to biodegrade in OECD 301D studies, with 28 -day degradations in the range of just a few percent. However, these results are likely impacted by the very low water solubility of TiDP. Abiotic degradation through hydrolysis is expected to be fairly rapid for TiDP with half-lives expected in the range of <4 -20 hrs (depending on pH). As such, TiDP is expected to have a short half-life in the environment due to its hydrolysis. TiDP's hydrolysis products (isodecyl alcohol and phosphorous acid) are readily biodegradable. TiDP does not appear to meet the criterion for persistence (P).
Bioaccumulation concentration factor (BCF) estimates for TiDP 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 all around 1 L/kg, well below the criterion of B (2000 L/kg) or vB (5000 L/kg).
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