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EC number: 700-067-2 | CAS number: 931419-77-1
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:
- form 2015-10-13 to 2015-11-04
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- Version / remarks:
- 2006-03-23
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Version / remarks:
- 2009-08-24
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 830.7950 (Vapor Pressure)
- Version / remarks:
- 1996-08
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- effusion method: by loss of weight or by trapping vaporisate
- Key result
- Temp.:
- 20 °C
- Vapour pressure:
- 0.004 Pa
- Temp.:
- 25 °C
- Vapour pressure:
- 0.005 Pa
- Conclusions:
- The estimated vapour pressure of the test item at 20 °C is 3.90E-3 Pa.
- Executive summary:
The vapour pressure of test item has been determined according to the effusion method described in OECD Guideline 104 and EU Regulation No 761/2009, Method A.4. The method is based on the estimation of the mass of test item flowing out per unit of time of a Knudsen cell in the form of vapour, through a micro-orifice under ultra-vacuum conditions. The mass of effused vapour was obtained by determining the loss of mass of the cell. The vapour pressure was calculated by applying the Hertz-Knudsen relation. The vapour pressure of the test item was determined at four different temperatures (30, 45, 60 and 75 °C). The vapour pressures at 20 and 25 °C were calculated from the linear regression equation to be 3.90E-3 and 5.04E-3 Pa, respectively.
Reference
The following vapour pressures were determined experimentally and considered as valid (mean and standard deviation given):
Experimentally Determined Vapour Pressures
T | T | P | Stand. Dev. P | RSD P |
°C | K | Pa | Pa | % |
30.0 | 303.2 | 6.58E-03 | 8.49E-04 | 12.9 % |
45.0 | 318.2 | 1.24E-02 | 2.86E-03 | 22.9 % |
60.0 | 333.2 | 2.50E-02 | 8.62E-03 | 34.4 % |
75.0 | 348.2 | 4.32E-02 | 7.55E-03 | 17.5 % |
Stand. Dev. = Standard Deviation; RSD = Relative Standard Deviation
The linear regression of log P vs. 1/T gave a correlation coefficient r of - 0.9994, showing good repeatability and precision. Therefore, the determination is considered as valid. For the test item, the following vapour pressures at 20 °C and at 25 °C were calculated from the regression equation:
Vapour pressure at 20 °C: | 3.90*10-03 Pa |
Vapour pressure at 25 °C: | 5.04*10-03 Pa |
Description of key information
The estimated vapour pressure of the test item at 20 °C is 3.90E-3 Pa.
Key value for chemical safety assessment
- Vapour pressure:
- 0.004 Pa
- at the temperature of:
- 20 °C
Additional information
The vapour pressure of test item has been determined according to the effusion method described in OECD Guideline 104 and EU Regulation No 761/2009, Method A.4. The method is based on the estimation of the mass of test item flowing out per unit of time of a Knudsen cell in the form of vapour, through a micro-orifice under ultra-vacuum conditions. The mass of effused vapour was obtained by determining the loss of mass of the cell. The vapour pressure was calculated by applying the Hertz-Knudsen relation. The vapour pressure of the test item was determined at four different temperatures (30, 45, 60 and 75 °C). The vapour pressures at 20 and 25 °C were calculated from the linear regression equation to be 3.90E-3 and 5.04E-3 Pa, respectively.
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