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EC number: 201-201-8
CAS number: 79-38-9
Henry's law constant (H): 31500 Pa m^3/mol (HENRYWIN v3.20, EPISUITE v1.00)
According to Appendix
R.7.1-4 “Henry’s law constant and evaporation rate” from the
Guidance on Information Requirements and Chemical Safety Assessment
Chapter R.7a: Endpoint Specific Guidance,Henry’s
law constant is one of the most important factors in determining the
environmental fate of chemicals. This physical law states that the mass
of gas dissolved by a given volume of solvent is proportional to the
pressure of the gas with which it is in equilibrium. The relative
constant quantifies the partitioning of chemicals between the aqueous
phase and the gas phase such as rivers, lakes and seas with respect to
the atmosphere (gas phase). Indeed, this constant is a fundamental input
for fugacity models that estimate the multimedia partitioning of
chemicals (Mackay, 1991).
CTFE is a volatile gas
at ambient conditions with a boiling point in
the range of -26.2°C (The Beilstein database. Reference: Miller - 1951 )
to -26.8°C (The Beilstein database. Reference: Henne - 1948)
and in case of accidental emission is
released only to air compartment, as indicated by the EQC Fugacity III
Model (v.2.02, The Canadian Centre for Environmental Modelling and
Chemistry, May 2003).
Hence, due to the
gaseous nature of the substance and its partition to the atmosphere, as
well as the consequent difficulty to appropriately test CTFE and provide
meaningful results, no experimental data are reported for Henry’s Law
constant. However, in order to evaluate this constant for CTFE, despite
the fact that it is expected to rapidly partition to the atmosphere
compartment, the result of the HENRYWIN model (v.3.20, EPI Suite v 4.0)
is afterwards discussed. The Guidance on Information Requirements and
Chemical Safety Assessment Chapter R.7a: Endpoint Specific Guidance,
Appendix R.7.1-4 indicates that substances with a Henry's Law constant
of around 1 hPa m3/mole rapidly volatilize from water.
On the basis of a
Henry’s Law constant of 31,500 Pa m3/mol (HENRYWIN v3.20, EPI Suite
v4.0), a boiling point ranging from -26.2°C
(The Beilstein database. Reference: Miller - 1951 ) to -26.8°C (The
Beilstein database. Reference: Henne - 1948)
the high vapour pressure of 612
kPa at 25°C (ISCS No. 0685,
NIOSH) and a moderate water
solubility (the water
solubility value of 380 mg/L has been evaluated in a closed system with
the atmosphere saturated of CTFE hence it represents an overestimation
of the actual water solubility of CTFE in the natural system) CTFE
is expected to primarily and rapidly partition to the atmosphere.
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