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EC number: 481-730-0 | CAS number: 848301-65-5
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:
- June 2005
- 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.
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- isoteniscope
- Temp.:
- 25 °C
- Vapour pressure:
- 4 400 Pa
- Transition / decomposition:
- no
- Conclusions:
- vapour pressure = 4400 Pa (at 25°C)
- Executive summary:
Testing was conducted using EU-Method A.4. The vapour pressure was determined using an isoteniscope system with measurements being made at several temperatures and linear regression analysis used to calculate the vapour pressure at 25 °C. The test was conducted without prior degassing in order to minimise the loss of the volatile components.
The vapour pressure of the test material has been determined to be 4400 Pa at 25 ºC (arithmetic mean of three determinations); the test material did not change in appearance under the conditions used in the determination.
Reference
Calculation
The vapour pressure is related to temperature by the following equation:
Log10[Vp (Pa)] = [slope / temperature (K)]+ intercept
A plot ofLog10[Vp (Pa)] versus reciprocal temperature [1/T(K)] therefore gives a straight line graph.
The vapour pressure of the sample was measured over a range of temperatures to enable extrapolation to 298.15 K.
Results
Run 1:
| LHS Column (cm Hg) | RHS Column (cm Hg) | Temperature (°C) | Vapour pressure (Pa) | Temperature (K) | Reciprocal Temperature (K-1) | Log10Vp |
| 59.1 | 17.4 | 75.6 | 55595.43 | 348.75 | 0.002867384 | 4.745039075 |
| 57.5 | 19.1 | 73.2 | 51195.79 | 346.35 | 0.002887253 | 4.709234245 |
| 56.0 | 20.5 | 71.2 | 47329.44 | 344.35 | 0.002904022 | 4.675131373 |
| 55.4 | 21.2 | 70.0 | 45596.25 | 343.15 | 0.002914177 | 4.658929126 |
| 54.0 | 22.6 | 68.2 | 41863.22 | 341.35 | 0.002929544 | 4.621832668 |
| 53.8 | 22.9 | 67.2 | 41196.61 | 340.35 | 0.002938152 | 4.614861500 |
| 52.2 | 24.4 | 65.6 | 37063.62 | 338.75 | 0.002952030 | 4.568947816 |
| 51.7 | 24.8 | 64.4 | 35863.72 | 337.55 | 0.002962524 | 4.554655300 |
| 51.0 | 25.6 | 63.3 | 33863.88 | 336.45 | 0.002972210 | 4.529736737 |
| 50.1 | 26.5 | 62.4 | 31464.08 | 335.55 | 0.002980182 | 4.497815023 |
| 49.9 | 26.8 | 61.4 | 30797.47 | 334.55 | 0.002989090 | 4.488515000 |
| 49.0 | 27.6 | 60.8 | 28530.99 | 333.95 | 0.002994460 | 4.455316793 |
| 48.9 | 27.8 | 60.1 | 28131.02 | 333.25 | 0.003000750 | 4.449185475 |
| 48.6 | 28.0 | 59.3 | 27464.41 | 332.45 | 0.003007971 | 4.438770241 |
| 48.5 | 28.2 | 58.6 | 27064.44 | 331.75 | 0.003014318 | 4.432399058 |
LHS: Left Hand side; RHS: Right Hand Side
A plot of Log10[vapour pressure (Pa)] versus reciprocal temperature [1/T(K)] for Run 1 gives the following statistical data using an unweighted least squares treatment:
Slope -2246.888; Standard deviation in slope 53.965; Intercept 11.201; Standard deviation in intercept 0.159.
The results obtained indicate the following vapour pressure relationship: Log10(Vp (Pa)) = -2246.888/temp(K) + 11.201.
The above yields a vapour pressure (Pa) at 298.15 K with a common logarithm of 3.665.
Run 2:
| LHS Column (cm Hg) | RHS Column (cm Hg) | Temperature (°C) | Vapour pressure (Pa) | Temperature (K) | Reciprocal Temperature (K-1) | Log10Vp |
| 50.5 | 26.1 | 73.5 | 32530.66 | 346.65 | 0.002884754 | 4.512292846 |
| 49.8 | 26.8 | 71.8 | 30664.14 | 344.95 | 0.002898971 | 4.486630856 |
| 49.4 | 27.2 | 70.8 | 29597.57 | 343.95 | 0.002907399 | 4.471255995 |
| 49.0 | 27.6 | 69.7 | 28530.99 | 342.85 | 0.002916727 | 4.455316793 |
| 48.3 | 28.2 | 68.0 | 26797.80 | 341.15 | 0.002931262 | 4.428099078 |
| 47.9 | 28.6 | 66.9 | 25731.22 | 340.05 | 0.002940744 | 4.410460329 |
| 47.5 | 29.0 | 66.0 | 24664.64 | 339.15 | 0.002948548 | 4.392074749 |
| 47.2 | 29.3 | 65.1 | 23864.70 | 338.25 | 0.002956393 | 4.377756051 |
| 46.9 | 29.6 | 64.1 | 23064.77 | 337.25 | 0.002965159 | 4.362949123 |
| 46.6 | 30.0 | 63.1 | 22131.51 | 336.25 | 0.002973978 | 4.345011108 |
| 46.3 | 30.2 | 62.4 | 21464.90 | 335.55 | 0.002980182 | 4.331728896 |
| 46.0 | 30.6 | 61.2 | 20531.64 | 334.35 | 0.002990878 | 4.312423741 |
| 45.6 | 31.0 | 60.2 | 19465.07 | 333.35 | 0.002999850 | 4.289255876 |
| 45.3 | 31.2 | 59.3 | 18798.45 | 332.45 | 0.003007971 | 4.274122133 |
| 45.0 | 31.5 | 58.4 | 17998.52 | 331.55 | 0.003016136 | 4.255236789 |
A plot of Log10[vapour pressure (Pa)] versus reciprocal temperature [1/T(K)] for Run 2 gives the following statistical data using an unweighted least squares treatment:
Slope -1950.245; Standard deviation in slope 18.563; Intercept 10.142; Standard deviation in intercept 0.055.
The results obtained indicate the following vapour pressure relationship: Log10(Vp (Pa)) = -1950.245/temp(K) + 10.142.
The above yields a vapour pressure (Pa) at 298.15 K with a common logarithm of 3.601.
Run 3:
| LHS Column (cm Hg) | RHS Column (cm Hg) | Temperature (°C) | Vapour pressure (Pa) | Temperature (K) | Reciprocal Temperature (K-1) | Log10Vp |
| 55.2 | 21.3 | 79.5 | 45196.28 | 352.65 | 0.002835673 | 4.655102718 |
| 54.6 | 22.0 | 78.0 | 43463.09 | 351.15 | 0.002847786 | 4.638120620 |
| 54.0 | 22.5 | 76.7 | 41996.55 | 349.85 | 0.002858368 | 4.623213574 |
| 53.3 | 23.2 | 75.5 | 40130.03 | 348.65 | 0.002868206 | 4.603469516 |
| 52.5 | 23.9 | 74.0 | 38130.20 | 347.15 | 0.002880599 | 4.581269053 |
| 51.9 | 24.6 | 72.8 | 36397.01 | 345.95 | 0.002890591 | 4.561065667 |
| 51.4 | 25.1 | 71.6 | 35063.78 | 344.75 | 0.002900653 | 4.544858769 |
| 50.9 | 25.6 | 70.5 | 33730.56 | 343.65 | 0.002909937 | 4.528023541 |
| 50.3 | 26.2 | 69.4 | 32130.69 | 342.55 | 0.002919282 | 4.506920063 |
| 49.8 | 26.7 | 68.3 | 30797.47 | 341.45 | 0.002928686 | 4.488515000 |
| 49.4 | 27.1 | 67.3 | 29730.89 | 340.45 | 0.002937289 | 4.473207883 |
| 49.0 | 27.6 | 66.2 | 28530.99 | 339.35 | 0.002946810 | 4.455316793 |
| 48.5 | 28.1 | 65.0 | 27197.76 | 338.15 | 0.002957267 | 4.434533188 |
| 48.0 | 28.5 | 63.8 | 25997.86 | 336.95 | 0.002967799 | 4.414937631 |
| 47.6 | 29.0 | 62.8 | 24797.96 | 335.95 | 0.002976633 | 4.394415964 |
| 47.3 | 29.2 | 61.8 | 24131.35 | 334.95 | 0.002985520 | 4.382581595 |
| 46.8 | 29.7 | 60.6 | 22798.13 | 333.75 | 0.002996255 | 4.357899131 |
| 46.5 | 30.0 | 59.6 | 21998.19 | 332.75 | 0.003005259 | 4.342386964 |
| 46.2 | 30.3 | 58.5 | 21198.26 | 331.65 | 0.003015227 | 4.326300144 |
| 45.9 | 30.6 | 57.5 | 20398.32 | 330.65 | 0.003024346 | 4.309594451 |
| 45.5 | 31.0 | 56.5 | 19331.74 | 329.65 | 0.003033520 | 4.286271022 |
| 45.3 | 31.2 | 55.7 | 18798.45 | 328.85 | 0.003040900 | 4.274122133 |
| 45.0 | 31.5 | 54.6 | 17998.52 | 327.75 | 0.003051106 | 4.255236789 |
| 44.8 | 31.8 | 53.7 | 17331.91 | 326.85 | 0.003059507 | 4.238846372 |
| 44.5 | 32.0 | 52.6 | 16665.30 | 325.75 | 0.003069839 | 4.221813033 |
| 44.2 | 32.3 | 51.8 | 15865.36 | 324.95 | 0.003077397 | 4.200449982 |
| 44.0 | 32.5 | 50.9 | 15332.07 | 324.05 | 0.003085944 | 4.185600860 |
| 43.8 | 32.7 | 50.2 | 14798.78 | 323.35 | 0.003092624 | 4.170225999 |
| 43.6 | 33.0 | 49.3 | 14132.17 | 322.45 | 0.003101256 | 4.150208885 |
| 43.3 | 33.2 | 48.2 | 13465.56 | 321.35 | 0.003111872 | 4.129224394 |
A plot of Log10[vapour pressure (Pa)] versus reciprocal temperature [1/T(K)] for Run 3 gives the following statistical data using an unweighted least squares treatment:
Slope -1917.592; Standard deviation in slope 8.496; Intercept 10.104; Standard deviation in intercept 0.025.
The results obtained indicate the following vapour pressure relationship: Log10(Vp (Pa)) = -1917.592/temp(K) + 10.104.
The above yields a vapour pressure (Pa) at 298.15 K with a common logarithm of 3.672.
Summary of results
| Run | Log10[Vp(25°C)] |
| 1 | 3.665 |
| 2 | 3.601 |
| 3 | 3.672 |
| Mean | 3.646 |
| VapourPressure | 4400 Pa |
The test material did not change in appearance under the conditions used in the determination.
Description of key information
vapour pressure of the test material: 4400 Pa at 25ºC
Key value for chemical safety assessment
- Vapour pressure:
- 4 400 Pa
- at the temperature of:
- 25 °C
Additional information
Testing was conducted using EU-Method A.4. The vapour pressure was determined using an isoteniscope system with measurements being made at several temperatures and linear regression analysis used to calculate the vapour pressure at 25 °C. The test was conducted without prior degassing in order to minimise the loss of the volatile components.
The vapour pressure of the test material has been determined to be 4400 Pa at 25 ºC (arithmetic mean of three determinations); the test material did not change in appearance under the conditions used in the determination.
Vapour pressure values for constituents of GTL Naphtha were calculated using a validated prediction method using the following equation:
log VP (Pa) = 6.999 – 0.355*(CH3) – 0.483*(CH2) – 0.515*(CH)
Where:
(CH3) = number of terminal methyl groups
(CH2) = number of unbranched mid-chain groups
(CH) = number of branched mid-chain groups
Additional information is given in the attached QM(P)RF documents.
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