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EC number: 700-569-1 | CAS number: 23588-51-4
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:
- 2013
- 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:
- adopted 23. Mar 2006
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Version / remarks:
- dated 31 May 2008
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 830.7950 (Vapor Pressure)
- Version / remarks:
- dated Aug 1996
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- static method
- Key result
- Temp.:
- 20 °C
- Vapour pressure:
- 52 Pa
- Key result
- Temp.:
- 25 °C
- Vapour pressure:
- 69 Pa
- Conclusions:
- From the measured values, the vapour pressure of the substance was calculated to be 52 Pa at 20.0 °C and 69 Pa at 25 °C, respectively.
- Executive summary:
A study was conducted according to OECD TG 104 Regulation (EC) No 440/2008 method A.4 to determine the vapour pressure of the test substance. The vapour pressure of the test substance was measured using the static method. In a temperature range of 15.6 – 57.0 °C eleven pairs of temperature/vapour pressure values were measured. The values of the heating and cooling down phase showed good correspondence and correlated well with the values which were measured in the experiment. Therefore, the result of the study is considered valid. The measured values for pressure P and temperature T were used to calculate pairs of log P and 1/T. These values were plotted, from the linear regression, vapour pressures at ambient temperature were determined. The vapour pressures of the substance was determined to be 52 Pa at 20 °C and 69 Pa at 25 °C, respectively.
Reference
The measured values are presented in the following table.
1. Determination |
2. Determination |
||
Temp. in °C |
Pressure in mbar |
Temp. in °C |
Pressure in mbar |
20.0 |
0.50 |
49.6 |
2.60 |
29.0 |
0.80 |
40.9 |
1.70 |
38.0 |
1.30 |
32.1 |
1.10 |
46.9 |
2.20 |
24.2 |
0.70 |
55.0 |
3.20 |
15.6 |
0.40 |
57.0 |
3.60 |
----- |
----- |
From the measured values for the increasing and for the decreasing temperature, log P (in log Pa) and 1/T (in 1/K) were calculated. The measured and the calculated values were plotted (p against T and log P against 1/T). The regression curve with slope B, intercept A and correlation r was calculated (graph log P vs 1/t).
Calculated values for 1/T and log P
n |
Temperature T |
Pressure P |
Temperature T |
1/T |
log P |
|
°C |
mbar = hPa |
K |
1/K |
log Pa |
1 |
20.0 |
0.50 |
293.15 |
0.00341122 |
1.6990 |
2 |
29.0 |
0.80 |
302.15 |
0.00330961 |
1.9031 |
3 |
38.0 |
1.30 |
311.15 |
0.00321388 |
2.1139 |
4 |
46.9 |
2.20 |
320.05 |
0.00312451 |
2.3424 |
5 |
55.0 |
3.20 |
328.15 |
0.00304739 |
2.5051 |
6 |
57.0 |
3.60 |
330.15 |
0.00302893 |
2.5563 |
7 |
49.6 |
2.60 |
322.75 |
0.00309837 |
2.4150 |
8 |
40.9 |
1.70 |
314.05 |
0.00318421 |
2.2304 |
9 |
32.1 |
1.10 |
305.25 |
0.00327600 |
2.0414 |
10 |
24.2 |
0.70 |
297.35 |
0.00336304 |
1.8451 |
11 |
15.6 |
0.40 |
288.75 |
0.00346320 |
1.6021 |
Linear Regression Parameters
Parameter |
Value |
Slope |
-2201.844555 |
Intercept |
9.22401737 |
Correlation coefficient r |
-0.99780618 |
Description of key information
From the measured values, the vapour pressure of the substance was calculated to be 52 Pa at 20.0 °C and 69 Pa at 25 °C, respectively.
Key value for chemical safety assessment
- Vapour pressure:
- 52 Pa
- at the temperature of:
- 20 °C
Additional information
A study was conducted according to OECD TG 104 Regulation (EC) No 440/2008 method A.4 to determine the vapour pressure of the test substance. The vapour pressure of the test substance was measured using the static method. In a temperature range of 15.6 – 57.0 °C eleven pairs of temperature/vapour pressure values were measured. The values of the heating and cooling down phase showed good correspondence and correlated well with the values which were measured in the experiment. Therefore, the result of the study is considered valid. The measured values for pressure P and temperature T were used to calculate pairs of log P and 1/T. These values were plotted, from the linear regression, vapour pressures at ambient temperature were determined. The vapour pressure was determined to be 52 Pa at 20 °C and 69 Pa at 25 °C, respectively.
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