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EC number: 500-078-0
CAS number: 31923-84-9
1 - 4.5 moles propoxylated
The structure-fragment calculation method indicates a log Pow range of
-1.00 to -0.30 for components of this UVCB mixture. The upper limit
value of log Pow = -0.30 is used to conservatively represent
partitioning of the components of this UVCB substance in the chemical
safety assessment (Dow, 2010).
Octanol water partitioning of this UVCB mixture was investigated using
the HPLC and shake-flask method (EU Method A.8) and under the conditions
of the study, the partition coefficient n-octanol/water (log Pow) for
components ranged from less than 0.3 to 1.6 (HPLC method) and by the
shake-flask method was 0.0. In both cases, the results were suspected to
be influenced by surface-active properties of the substance (surface
tension = 38.4 nM/m at 20°C). Therefore, calculated values were
generated for the lowest- and highest-molecular weight homologues of
this mixture using the ClogP structure-fragment method. These calculated
values indicate a log Pow range of -1.00 to -0.30 for this UVCB mixture.
The upper limit value of log Pow = -0.30 is used to conservatively
represent partitioning of the components of this UVCB substance in the
environmental exposure assessment. It should also be noted that these
values of log Pow represent that for aqueous pH at which the substance
is not ionized. The components of this substance possess ionizable amino
groups, which have estimated pKa values ranging from 14.2 to 14.5.
Therefore, these substances will occur as partly- or fully-ionized
species under the neutral pH conditions occurring in the environment,
and will have hydrophobicity which is much less than indicated from log
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