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EC number: 202-908-4
CAS number: 101-02-0
The environmental fate properties of the
triphenyl phosphite (TPP) and related phenyl/alkyl phosphites generally
include: low water solubility, low vapor pressure, and rapid hydrolysis
to phosphorous acid and corresponding alcohols (in the case of TPP it is
In fugacity Level III modeling with equal
emissions to all three compartments or with just emissions to water, the
majority of the category members partition to the soil and sediment.
With emissions to just air or soil, the majority of the releases
partition to the soil compartment.
A recent OECD 301D biodegradation study on TPP
(van Ginkel, 2015) showed
that this substance does readily biodegrade. The 28 -day degradation of
TPP in this study was 84%. These results are also consistent with the
expectation that TPP rapidly hydrolyzes to phenol, which is also readily
biodegradable. The earlier TPP biodegradation study is now considered
invalid as it appears that the study did not adequately address the very
low water solubility of this substance. The new data demonstrate that
TPP is not persistent.
Reliable bioaccumulation concentration factor
(BCF) estimates for TPP are difficult to obtain due to the rapid
hydrolysis. However, it is because of this rapid hydrolysis that the
potential for bioaccumulation is expected to be very low. BCF
values from the BCFBAF v3.00 model are very low, though these data are
not considered reliable because they do not consider hydrolysis or
biotranformation of the substance, both of which are expected to be
high. The BCF of phenol (the primary hydrolysis product) is 17.5 L/Kg
(EU Phenol RAR 2006) and the other hydrolysis product is phosphorous
acid, which is inorganic, has a BCF of 2.68 L/kg wet-wt (BCFBAF 3.01).
These data support the conclusion that neither TPP nor its hydrolysis
products are expected to bioaccumulate and do not meet the criteria for
B or vB.
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