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biodegradation of this class of alkyl phosphites is expected to occur by
the hydrolysis of the phosphite (abiotic degradation) into their
component alcohols and then biodegradation of the alcohols. In this
regard, these phosphites could generally be considered as biodegradable
as their component alcohols. 2-Propylheptanol is readily biodegradable.
biodegradation screening study, OECD 301D Closed Bottle Test, was
performed by van Ginkel (2014) on TiTDP, a similar tris alkyl phosphite
analog, 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
new OECD 301D Closed Bottle Test was performed by van Ginkel (2019) on
phenyl diisodecyl phosphite, another related alkyl phosphite analog. The
results found 64% degradation at 28 da and were considered to be ready
biodegradable given the complex composition of the substance.
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