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EC number: 220-246-4
CAS number: 2687-12-9
Validation of the method is performed at least once every year
(project 512551). Each reference substance was measured in duplicate by
TGA using a temperature program that was specific for the substance.
Plots of log vT obtained at elevated temperatures and 1/T
were inter- or extrapolated to determine the log vTvalues at
20°C (log vT,20). The log vT,20 values
were plotted against the logarithm of the vapour pressure at 20°C in
Pascal units (log PT,20). Linear regression analysis using
the least squares method yielded an equation of log PT,20=
1.34 log vT,20+ 4.96. The coefficient of correlation (r)
was > 0.99. The constants c and d specific for the
experimental arrangement were 1.34 and 4.96, respectively.
Isothermal TGA analysis: from the plot of the log PT of
the test item as a function of the reciprocal temperature the equation
of the curve could be derived: log PT= -4521 x 1/T + 15.71 (r
= 0.995, n = 8). The results for the vapour pressure of the test item at
20°C and 25°C are:
The vapour pressure of T000749 was assessed using the isothermal TGA
effusion method, following the guidelines OECD 104, EU method A.4 and
EPA OPPTS 830.7950 (K1, Reingruber, 2017).
The vapour pressure of the substance was determined to be 2.0 Pa at 20°C
and 3.6 Pa at 25°C.
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