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EC number: 445-760-8 | CAS number: 122886-55-9
Vapour pressure
Administrative data
Link to relevant study record(s)
- Endpoint:
- vapour pressure
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- November 28, 2002 - November 30, 2002
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Version / remarks:
- (1992)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- effusion method: vapour pressure balance
- Temp.:
- 25 °C
- Vapour pressure:
- < 0 Pa
- Conclusions:
- The vapour pressure of the substance is <0.00026 Pa (at 25 degrees Celsius), determined with the vapour pressure balance method in accordance with EU Method A.4 (1992) and GLP.
Reference
- For all 5 measurements it was not possible to do linear regression analysis due to the nature of the 5 plots obtained. The balance readings were very low (even 0 or below 0) and most importantly, in all 5 measurements the readings were too variable for fitting a linear regression line.
- Therefore it was decided to impose a regression slope on a chosen data point to provide a maximum value for the Vp at 25 degrees Celsius
- Measurement #5 was chosen for this determination, because the sample had been under vacuum for the longest period prior to this measurement and so degassing would have been the most complete
- The reading at 195 degrees Celsius was chosen because it gives the highest estimated vapour pressure (as it is the highest used temperature in this measurement). At this reading, the mass difference was 12.53 µg and therefore the Vp and Log Vp were determined to be 0.017394850 and -1.759579308, respectively.
- For the slope of the regression, the value of -1500 K was chosen as it is the shallowest slope observed in the laboratory whilst determining the vapour pressure on a wide range of samples using this method.
- Using this slope, the intercept was calculated using the equation: -1.75958 = (-1500/468.15) + intercept. An intercept of 1.445 was found.
- Using the slope of -1500 K and an intercept of 1.445, the vapour pressure at 25 degrees Celsius (298.15 K) was determined to be 0.00026 Pa, using the equation: log Vp = (-1500/298.15) + 1.445
- The test material did not change in appearance
Description of key information
The vapour pressure of the substance is <0.00026 Pa at 25 degrees Celsius.
Key value for chemical safety assessment
- Vapour pressure:
- 0 Pa
- at the temperature of:
- 25 °C
Additional information
The vapour pressure of the substance is determined with the vapour pressure balance method in accordance with EU Method A.4 (1992) and GLP.
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