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Vapour pressure
Administrative data
- Endpoint:
- vapour pressure
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- Testing was conducted between 12 June 2008 and 10 July 2008.
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: Study conducted to GLP and in compliance with agreed protocols, with no or minor deviations from standard test guidelines and/or minor methodological deficiencies, which do not effect the quality of the relevant results.
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 008
- Report date:
- 2008
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Remarks:
- The work described was performed in compliance with UK GLP standards (Schedule 1, Good Laboratory Practice Regulations 1999 (SI 1999/3106 as amended by SI 2004/0994)).
- Type of method:
- effusion method: vapour pressure balance
Test material
Constituent 1
Results and discussion
Vapour pressure
- Temp.:
- 25 °C
- Vapour pressure:
- < 0 Pa
Any other information on results incl. tables
Run 1
Temperature (ºC) |
Temperature (K) |
Reciprocal Temperature (K-1) |
Mass Difference (µg) |
Mass Difference (kg) |
Vapour Pressure (Pa) |
Log10 Vp |
120 |
393.15 |
0.002543558 |
1.46 |
1.460E-09 |
0.002026854 |
-2.693177523 |
121 |
394.15 |
0.002537105 |
1.30 |
1.300E-09 |
0.001804733 |
-2.743587026 |
122 |
395.15 |
0.002530685 |
2.28 |
2.280E-09 |
0.003165224 |
-2.499595532 |
123 |
396.15 |
0.002524296 |
0.65 |
6.500E-10 |
0.000902367 |
-3.044617022 |
124 |
397.15 |
0.002517940 |
1.95 |
1.950E-09 |
0.002707100 |
-2.567495767 |
125 |
398.15 |
0.002511616 |
2.60 |
2.600E-09 |
0.003609466 |
-2.442557031 |
126 |
399.15 |
0.002505324 |
2.20 |
2.200E-09 |
0.003054164 |
-2.515107698 |
127 |
400.15 |
0.002499063 |
1.46 |
1.460E-09 |
0.002026854 |
-2.693177523 |
128 |
401.15 |
0.002492833 |
0.81 |
8.100E-10 |
0.001124488 |
-2.949045360 |
129 |
402.15 |
0.002486634 |
0.98 |
9.800E-10 |
0.001360491 |
-2.866304303 |
130 |
403.15 |
0.002480466 |
1.06 |
1.060E-09 |
0.001471552 |
-2.832224513 |
No statistical analysis is given due to the nature of the plot
Run 2
Temperature (ºC) |
Temperature (K) |
Reciprocal Temperature (K-1) |
Mass Difference (µg) |
Mass Difference (kg) |
Vapour Pressure (Pa) |
Log10 Vp |
120 |
393.15 |
0.002543558 |
0.73 |
7.300E-10 |
0.001013427 |
-2.994207519 |
121 |
394.15 |
0.002537105 |
0.73 |
7.300E-10 |
0.001013427 |
-2.994207519 |
122 |
395.15 |
0.002530685 |
1.55 |
1.550E-09 |
0.002151797 |
-2.667198681 |
123 |
396.15 |
0.002524296 |
0.98 |
9.800E-10 |
0.001360491 |
-2.866304303 |
124 |
397.15 |
0.002517940 |
0.08 |
8.000E-11 |
0.000111060 |
-3.954440392 |
125 |
398.15 |
0.002511616 |
1.55 |
1.550E-09 |
0.002151797 |
-2.667198681 |
126 |
399.15 |
0.002505324 |
-0.57 |
-5.700E-10 |
- |
- |
127 |
400.15 |
0.002499063 |
1.46 |
1.460E-09 |
0.002026854 |
-2.693177523 |
128 |
401.15 |
0.002492833 |
0.73 |
7.300E-10 |
0.001013427 |
-2.994207519 |
129 |
402.15 |
0.002486634 |
0.65 |
6.500E-10 |
0.000902367 |
-3.044617022 |
130 |
403.15 |
0.002480466 |
0.81 |
8.100E-10 |
0.001124488 |
-2.949045360 |
No statistical analysis is given due to the nature of the plot
Run 3
Temperature (ºC) |
Temperature (K) |
Reciprocal Temperature (K-1) |
Mass Difference (µg) |
Mass Difference (kg) |
Vapour Pressure (Pa) |
Log10 Vp |
120 |
393.15 |
0.002543558 |
1.22 |
1.220E-09 |
0.001693673 |
-2.771170548 |
121 |
394.15 |
0.002537105 |
1.22 |
1.220E-09 |
0.001693673 |
-2.771170548 |
122 |
395.15 |
0.002530685 |
0.81 |
8.100E-10 |
0.001124488 |
-2.949045360 |
123 |
396.15 |
0.002524296 |
0.81 |
8.100E-10 |
0.001124488 |
-2.949045360 |
124 |
397.15 |
0.002517940 |
0.98 |
9.800E-10 |
0.001360491 |
-2.866304303 |
125 |
398.15 |
0.002511616 |
1.22 |
1.220E-09 |
0.001693673 |
-2.771170548 |
126 |
399.15 |
0.002505324 |
1.06 |
1.060E-09 |
0.001471552 |
-2.832224513 |
127 |
400.15 |
0.002499063 |
-0.16 |
-1.600E-10 |
- |
- |
128 |
401.15 |
0.002492833 |
1.38 |
1.380E-09 |
0.001915794 |
-2.717651292 |
129 |
402.15 |
0.002486634 |
1.38 |
1.380E-09 |
0.001915794 |
-2.717651292 |
130 |
403.15 |
0.002480466 |
0.41 |
4.100E-10 |
0.000569185 |
-3.244746522 |
No statistical analysis is given due to the nature of the plot
Run 4
Temperature (ºC) |
Temperature (K) |
Reciprocal Temperature (K-1) |
Mass Difference (µg) |
Mass Difference (kg) |
Vapour Pressure (Pa) |
Log10 Vp |
120 |
393.15 |
0.002543558 |
0.81 |
8.100E-10 |
0.001124488 |
-2.949045360 |
121 |
394.15 |
0.002537105 |
0.33 |
3.300E-10 |
0.000458125 |
-3.339016439 |
122 |
395.15 |
0.002530685 |
0.33 |
3.300E-10 |
0.000458125 |
-3.339016439 |
123 |
396.15 |
0.002524296 |
0.57 |
5.700E-10 |
0.000791306 |
-3.101655523 |
124 |
397.15 |
0.002517940 |
-0.16 |
-1.600E-10 |
- |
- |
125 |
398.15 |
0.002511616 |
0.81 |
8.100E-10 |
0.001124488 |
-2.949045360 |
126 |
399.15 |
0.002505324 |
0.65 |
6.500E-10 |
0.000902367 |
-3.044617022 |
127 |
400.15 |
0.002499063 |
1.87 |
1.870E-09 |
0.002596039 |
-2.585688772 |
128 |
401.15 |
0.002492833 |
0.90 |
9.000E-10 |
0.001249431 |
-2.903287869 |
129 |
402.15 |
0.002486634 |
0.65 |
6.500E-10 |
0.000902367 |
-3.044617022 |
130 |
403.15 |
0.002480466 |
1.14 |
1.140E-09 |
0.001582612 |
-2.800625527 |
No statistical analysis is given due to the nature of the plot
Discussion
No statistical analyses were performed because the balance readings were too low and variable for a line of best fit to have any meaning. Instead it was considered more appropriate to impose a regression slope on a chosen data point to provide an estimate of the maximum value for the vapour pressure at 25ºC.
Run 4 was chosen because the sample had been under vacuum for the longest period prior to this run and so degassing would have been the most complete. The reading at 127ºC (400.15 K) was chosen because this is the data point which gives the highest estimated vapour pressure at any given temperature when a slope of -1500 K is imposed upon it.
The value of -1500 K is an in-house value and is the shallowest slope observed whilst determining the vapour pressure on a wide range of samples using the vapour pressure balance method. Extrapolation to 25ºC gave a vapour pressure of 1.355 x 10-4 Pa which has been taken as a maximum for this material.
The test material did not change in appearance under the conditions used in the determination.
Conclusion
The vapour pressure of the test material has been determined to be less than 1.4 x 10-4 Pa at 25ºC.
Applicant's summary and conclusion
- Conclusions:
- The vapour pressure of the test material has been determined to be less than 1.4 x 10-4 Pa at 25ºC.
- Executive summary:
The vapour pressure for substance NDS-Li in project number 1307 -0448 was determined using a vapour pressure balance with measurements being made at several temperatures and linear regression analysis used to calculate the vapour pressure at 25°C. Testing was conducted using Method A4 of Commission Directive 92/69/EEC (which constitutes Annex V of Council Directive 67/548/EEC).
The vapour pressure of the test material has been determined to be less than 1.4 x 10-4 Pa at 25ºC.
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