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EC number: 218-780-8 | CAS number: 2234-16-4
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:
- 30 January 2018
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline 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)
- Type of method:
- effusion method: Knudsen cell
- Key result
- Temp.:
- ca. 20 °C
- Vapour pressure:
- ca. 1.16 Pa
- Key result
- Temp.:
- ca. 25 °C
- Vapour pressure:
- ca. 3.2 Pa
- Conclusions:
- The determined vapour pressure of the test item is 1.16 Pa at 20ºC and 3.20 Pa at 25ºC.
- Executive summary:
The vapour pressure of the test item was determined according to OECD 104 and EU method A.4, following GLP, using an apparatus with Knudsen cell. The determined vapour pressure of the test item was 1.16 Pa at 20ºC and 3.20 Pa at 25ºC.
Reference
Vapour pressure at 20ºC and 25ºC was calculated on the basis of equation
log(p)=f(1/t)=a-b/(t+273.15)
where: p= vapour pressure in Pa, t=temperature in ºC, obtained for four measurements points: 24.5 0C, 26.6 0C, 28.8 0C and 30.8 0C.
| Temperature [ºC] (t) | Vapour pressure [Pa] (P) | Evaporation rate [µg/min] |
| 24.5 | 2.86 | 30.59 |
| 26.6 | 4.45 | 47.38 |
| 28.8 | 6.78 | 71.95 |
| 30.8 | 9.82 | 103.95 |
Equation ln(P)=a-b/(t+273,15) a= 26.2602; b= 7679.07; R2= 0.9939
Calculated values:
| Temperature [ºC] | Pressure [Pa] |
| 20 | 1.16 |
| 25 | 3.20 |
Description of key information
Key study: OECD 104 and EU method A.4. GLP study. The determined vapour pressure of the test item is 1.16 Pa at 20ºC and 3.20 Pa at 25ºC.
Key value for chemical safety assessment
- Vapour pressure:
- 3.2 Pa
- at the temperature of:
- 25 °C
Additional information
Key study: The vapour pressure of the test item was determined according to OECD 104 and EU method A.4, following GLP, using an apparatus with Knudsen cell. The determined vapour pressure of the test item was 1.16 Pa at 20ºC and 3.20 Pa at 25ºC.
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