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EC number: 947-215-4 | CAS number: -
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:
- 26 January 2018 - 12 February 2018
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Remarks:
- Study conducted according to OECD 104 and EU A.4 guidelines, under GLP without deviation and with certificate of analysis included.
- Reason / purpose for cross-reference:
- reference to same study
- Reason / purpose for cross-reference:
- reference to other study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Remarks:
- 2017-01-10
- Type of method:
- static method
- Temp.:
- 293.25 K
- Vapour pressure:
- ca. 605.5 Pa
- Temp.:
- 297.25 K
- Vapour pressure:
- ca. 626.5 Pa
- Temp.:
- 301.25 K
- Vapour pressure:
- ca. 646 Pa
- Temp.:
- 305.25 K
- Vapour pressure:
- ca. 667 Pa
- Temp.:
- 309.25 K
- Vapour pressure:
- 693 Pa
- Key result
- Temp.:
- 293.15 K
- Vapour pressure:
- ca. 604 Pa
- Remarks on result:
- other: Calculated
- Key result
- Temp.:
- 298.15 K
- Vapour pressure:
- ca. 631 Pa
- Remarks on result:
- other: Calculated
- Conclusions:
- The vapour pressure of 7-METHOXY-3,7-DIMETHYLOCTAN-2-OL MULTICONSTITUENT is 604 Pa at 20°C and 631 Pa at 25°C.
- Executive summary:
A study was performed to determine the vapour pressure of test item 7-METHOXY-3,7-DIMETHYLOCTAN-2-OL MULTICONSTITUENT. The method followed was designed to be compliant with the OECD Guideline for Testing of Chemicals No. 104, "Vapour Pressure".
In this analytical method, the vapour pressure of the test item at thermodynamic equilibrium was determined at various specified temperatures (from 20 to 36°C).
The Log10(Vapour Pressure (Pa)) was plotted against 1/T (K) and a linear function was obtained. With this equation, the vapour pressure has been calculated for temperatures of 20°C and 25°C.
A trial was conducted and nine values were recorded (two values for each temperature except 36°C).
Log10 (Vapour Pressure (Pa)) was plotted against reciprocal temperature and values of vapour pressure were calculated at 20°C and 25°C with the linear function parameters (slope and intercept):
Vapour pressure at 293.15 K Vapour pressure at 298.15 K 604 Pa 631 Pa Vapour pressures obtained for each temperature during the increasing and decreasing phases trials did not vary by more than 20% and the linear function obtained own a correltion coefficient R² over 0.95.
Moreover the calculated values showed good correspondence with the experimentally determined ones.
In conclusion, the vapour pressure of 7-METHOXY-3,7-DIMETHYLOCTAN-2-OL MULTICONSTITUENT is 604 Pa at 20°C and 631 Pa at 25°C.
Reference
Summary of pressures and corresponding temperatures:
|
Summary of pressures and corresponding temperatures
Vapour Pressure* (Pa) |
Corresponding Temperature (°C) |
Temperature (K) |
1/T (K-1) |
Log10(p) |
605.5 |
20.1 |
293.25 |
3.410E-03 |
2.782 |
626.5 |
24.1 |
297.25 |
3.364E-03 |
2.797 |
646.0 |
28.1 |
301.25 |
3.320E-03 |
2.810 |
667.0 |
32.1 |
305.25 |
3.276E-03 |
2.824 |
693.0 |
36.0 |
309.25 |
3.234E-03 |
2.841 |
*: mean of pressures values for increasing and decreasing temperature if available.
A plot of Log10(p) versus reciprocal temperature (1/T) (with p in Pa and T in K) gives the following statistical data using an unweighted least square treatment.
Slope -327.31
Intercept 3.8977
R² 0.9976
The results obtained indicate the following vapour pressure relationship:
Log10(p (Pa)) = -327.31 / T (K) + 3.8977
The above equation yields a vapour pressure of 604 Pa at 293.15 K and 631 Pa at 298.15 K.
Description of key information
The vapour pressure of 7-methoxy-3,7-dimethyloctan2-ol multiconstituent is:
604 Pa at 20°C
631 Pa at 25°C
Key value for chemical safety assessment
- Vapour pressure:
- 631 Pa
- at the temperature of:
- 25 °C
Additional information
A study was conducted according to OECD 104 and EU A.4 guidelines to measure the vapour pressure of the registered substance. As the results were obtained under GLP without deviation, they were considered as valid and reliable without restriction and used to propose a key value.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
