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EC number: 617-648-0 | CAS number: 849727-62-4
Validation of the method is performed at least once every year (project 508074). 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 vT values at 20°C (log vT,20). The log vT,20values 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= 1.17 log vT,20 + 4.66. The coefficient of correlation (r) was > 0.99. The constants c and d specific for the experimental arrangement were 1.17 and 4.66, 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= -5879 x 1/T + 16.28 (r = 0.9996, n = 8). The results for the vapour pressure of the test item at 20°C and 25°C is:
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