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EC number: 607-685-0
CAS number: 252964-68-4
Validation of the method is performed at least once every year
(project 517972). 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=
1.26 log vT,20+ 4.98. The coefficient of correlation (r)
was > 0.99. The constants c and d specific for the
experimental arrangement were 1.26 and 4.98, 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= -7391 x 1/T + 15.57 (r
= 0.993, n = 8). The results for the calculated vapour pressure of the
test item at 20°C and 25°C are:
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