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A vapour pressure was estimated using structure activity relationships models developed by the U.S. Environmental Protection Agency and Syracuse Research Corporation (EPIWIN, v. 3.10,US EPA and Syracuse Research Corporation, 2001). The vapour pressure was estimated to 5x10‑12Pa (Staples, 2001).
A much higher value of 0.047 Pa at 20°C was extrapolated from results obtained by isoteniscope (method ASTM D2879) at temperatures ranging from 125 to 375 °C (Phoenix_Chemical_Laboratory, 1997). These measured values are displayed below.
Vapour pressure data for TNPP(Phoenix Chemical Laboratory, 1997)
Vapour Pressure (Pa)
A strong relation between the temperature (1/T) and the vapour pressure is found. Excluding the last value measured at 375°C, the plot of the above results gives a linear regression with a good reliability. Vapour pressures of respectively 0.039 Pa and 0.058 Pa at 20°C and 25°C could be derived from this equation.
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