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Physical & Chemical properties

Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2016-11-07 to 2016-12-07
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:
23. March 2006
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
23 July 2009
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: Knudsen cell
Specific details on test material used for the study:
- Lot: 216-106
- Expiry date: 2018-06-16
- Storage conditions: Keep at room temperature
Key result
Temp.:
20 °C
Vapour pressure:
0 Pa
Key result
Temp.:
25 °C
Vapour pressure:
0 Pa

Vapour pressure was examined at six different temperatures. Five temperatures could be evaluated as they showed reproducible weight loss. For these temperatures, 1/T was plotted against log (P).

Vapour Pressures (Effusion Method)

Experiment

T

Mean P

Stand. Dev. P

RSD P

No.

K

Pa

Pa

%

2

318.2

1.99E-03

4.19E-04

21.0%

3

333.2

1.05E-02

2.54E-03

24.2%

4

348.2

3.32E-02

4.14E-03

12.5%

5

363.2

1.38E-01

2.86E-02

20.8%

6

378.2

3.68E-01

1.06E-01

28.8%

In this table, E-0X represents multiplication with 10^-x.

Stand. Dev. = Standard Deviation; RSD = Relative Standard Deviation

The graph 1/T vs. log (P) shows a straight line with a correlation coefficient of - 0.9989.

 

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:          1.28 * 10^-04Pa

Vapour pressure at 25 °C:          2.33 * 10^-04Pa

Conclusions:
The vapour pressure of the test item was determined to be 1.28 * 10^-04 Pa at 20 °C and 2.33 * 10^-04 Pa at 25 °C.
Executive summary:

A study was conducted according to OECD Test Guideline 104 (2006) and Regulation (EC) No 440/2008 method A.4 to determine the vapour pressure of the test item. Therefore the effusion method using Knudsen cells was employed. Vapour pressure was examined at six different temperatures. Five temperatures could be evaluated as they showed reproducible weight loss. For these temperatures, 1/T was plotted against log (P). The graph 1/T vs. log (P) shows a straight line with a correlation coefficient of - 0.9989. The vapour pressure of the test item was determined to be 1.28 * 10^-04Pa at 20 °C and 2.33 * 10^-04Pa at 25 °C.

Description of key information

The vapour pressure of the test item was determined to be 1.28 * 10^-04 Pa at 20 °C and 2.33 * 10^-04 Pa at 25 °C.

Key value for chemical safety assessment

Vapour pressure:
0 Pa
at the temperature of:
20 °C

Additional information

A study was conducted according to OECD Test Guideline 104 (2006) and Regulation (EC) No 440/2008 method A.4 to determine the vapour pressure of the test item. Therefore the effusion method using Knudsen cells was employed. Vapour pressure was examined at six different temperatures. Five temperatures could be evaluated as they showed reproducible weight loss. For these temperatures, 1/T was plotted against log (P). The graph 1/T vs. log (P) shows a straight line with a correlation coefficient of - 0.9989. The vapour pressure of the test item was determined to be 1.28 * 10^-04Pa at 20 °C and 2.33 * 10^-04Pa at 25 °C.