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EC number: 641-894-8
CAS number: 6740-87-0
Validation of the method is performed at least once every year
(project 520379). 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=
1.28 log vT,20 + 5.14. The coefficient of correlation
(r) was > 0.99. The constants c and d specific for the
experimental arrangement were 1.28 and 5.14, 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= -5206 x 1/T + 16.24 (r
= 0.999, n = 8). The results for the vapour pressure of the test item at
20°C and 25°C are:
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