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EC number: 216-600-2
CAS number: 1623-05-8
Releases of PPVE are anticipated to be primarily to the atmospheric
compartment. This compound is unlikely to partition to terrestrial or
aquatic compartments from the atmosphere based on partition coefficients
The experimental vapor pressure (410 mm Hg at 20 °C) and Henry’s Law
constant (3200 dimensionless, or 78.3 atm∙m³/mol, at 22.6 °C) suggest
that PPVE will partition from wet or dry terrestrial surfaces into the
atmosphere. Henry's Law constant (HLC) is used to describe the tendency
for a substance to partition from water to air, the higher the value the
greater the tendency for partitioning from water to air. For PPVE, the
measured HLC indicates that it is likely to volatilize from the aquatic
compartment into the atmosphere. Only negligible amounts of PPVE are
expected to be present in aquatic systems or soils.
The logarithm of the organic carbon normalized adsorption coefficient
(log Koc) is used to describe the tendency for a substance to partition
from water to soils or suspended solids. The log Koc could not be
measured but was calculated¹ to be 3.34 based on the measured log Kow
value (i.e., 4.0 at 21.9 °C). Given the rapid partitioning to the
atmosphere from soils and from water, the overall net partitioning of
PPVE will be to the atmosphere.
The logarithm of the octanol air partition (log Koa) coefficient is used
to describe the tendency of a substance to partition from air into the
lipid rich tissues of air breathing organisms. The calculated log Koa of
PPVE is 0.46, based on the dimensionless Henry’s Law constant value at
22.6 °C and the average experimental Kow value (that is, the
untransformed average of concentration ratios) of 9150 at 21.9 °C. This
log Koa value indicates that PPVE has a low potential to partition from
air to the lipid rich tissues of air-breathing organisms.
(1) European Chemicals Bureau: Technical Guidance Document of Risk
Assessment, Chapter 4.
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